Return-path: X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson Received: from beak.andrew.cmu.edu via trymail for +dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl@andrew.cmu.edu (->+dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl) (->ota+space.digests) ID ; Tue, 1 Jan 1991 03:48:48 -0500 (EST) Message-ID: Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Tue, 1 Jan 1991 03:47:30 -0500 (EST) Subject: SPACE Digest V12 #707 SPACE Digest Volume 12 : Issue 707 Today's Topics: NASA leadership meets with task force (Forwarded) SOLAR TERRESTRIAL FORECAST AND REVIEW Administrivia: Submissions to the SPACE Digest/sci.space should be mailed to space+@andrew.cmu.edu. Other mail, esp. [un]subscription notices, should be sent to space-request+@andrew.cmu.edu, or, if urgent, to tm2b+@andrew.cmu.edu ---------------------------------------------------------------------- Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 17 Dec 90 21:19:27 GMT From: trident.arc.nasa.gov!yee@ames.arc.nasa.gov (Peter E. Yee) Organization: NASA Ames Research Center, Moffett Field, CA Subject: NASA leadership meets with task force (Forwarded) Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu Jeff Vincent Headquarters, Washington, D.C. December 17, 1990 (Phone: 202/453-8369) 2 P.M. EST RELEASE: 90-161 NASA LEADERSHIP MEETS WITH TASK FORCE NASA Administrator Richard H. Truly and his senior managers from across the agency met Sat., Dec. 15, with Chairman Norman R. Augustine and a majority of the other members of the Advisory Committee on the Future of the U.S. Space Program. The advisory committee issues its full report this week. "The meeting was candid and very constructive," said Truly following the 3-hour, closed-door session in Easton, Md. "We find the committee's report to be extremely supportive of NASA and the civil space program, and we clarified a number of points during our meeting that will help us move forward quickly." The report makes 15 specific recommendations and a number of suggestions for changes in the direction and scope of future U.S. initiatives in space. Truly also announced he had named Donald R. Puddy, Director of the Flight Crew Operations Directorate at the Johnson Space Center, Houston, to head a small team to assist him in determining how best to implement those recommendations in the report under the purview of NASA. "Many of the report's recommendations are consistent with initiatives already underway at NASA," Truly said. "Others can be put in place fairly soon, while some, by their very nature, will take longer. Many of the most important recommendations are interrelated and resource-dependent and will depend on the strong support of not only NASA, but also the White House and Congress." Truly plans a holiday message to all NASA employees at noon (EST) tomorrow on NASA Select television, including a report on the weekend meeting. The session with the advisory committee members took place at the end of a 2-day NASA Senior Management Meeting (which had been previously scheduled) comprising the top managers from NASA Headquarters and the Directors and Deputy Directors of all NASA centers. The first day of the meeting was devoted to an in-depth discussion among the agency's leaders. The advisory committee members who joined the meeting the next day included Augustine, Edward C. (Pete) Aldridge, Jr., D. James Baker, Daniel J. Fink, Robert T. Herres, David T. Kearns and Louis J. Lanzerotti. ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: Mon, 17 Dec 90 14:53:28 MST From: std_oler%HG.ULeth.CA@vma.cc.cmu.edu (Cary Oler) Subject: SOLAR TERRESTRIAL FORECAST AND REVIEW To: space+%andrew.cmu.edu@vma.cc.cmu.edu X-St-Vmsmail-To: ST%"space+@andrew.cmu.edu" /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ Please Note: The document "Understanding Solar Terrestrial Reports" was distributed over the nets earlier this week. It is hoped that those of you who requested the document received it without too many problems. If any of you failed to receive the document, you may request it from "std_oler@hg.uleth.ca". If you are unable to establish contact using this address, or if you fail to receive a reply after one week, try resending the request or locate someone who has already obtained the document. There have been some problems in getting mail from hg.uleth.ca to some of those people who have requested information. Also, if any of you have placed the document on an anonymous FTP site, please notify std_oler@hg.uleth.ca. A public note may also be appreciated by those who have been unable to obtain the document through other routes. /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ --- SOLAR TERRESTRIAL FORECAST AND REVIEW --- December 16 to December 25, 1990 Report Based In-Part from Data Obtained from the Space Environment Services Center Boulder Colorado -------- SOLAR TERRESTRIAL REVIEW FOR 09 DECEMBER TO 15 DECEMBER. Flare activity this week was significantly enhanced. Four major flares occurred in three days. Not since early May has more frequent major flaring been observed. The major flaring began with the eruption of a class M5.8/2B flare from Region 6398 at 07:54 UT on 10 December. This flare was significant in that strong Type II and IV radio sweeps were observed during this flare. The Type II shock speed was estimated at 1400 km/second. The interplanetary shockwave from this flare was not as significant as was first expected, but it did produce minor geomagnetic storming over high latitudes and active conditions over most middle latitudes. A sudden magnetic impulse was observed near 21:46 UT on 12 December, corresponding to the impact of the shockwave. Radio propagation conditions immediately degenerated to poor levels over high latitudes and fair to poor levels over middle and some low latitudes. Increased signal flutter, absorption, noise, and distortion as well as increased geomagnetic and auroral activity were observed for the following 12 to 15 hours. Conditions quickly improved, however, to near-normal levels approximately 18 to 24 hours after the flare effects hit and have remained at near normal levels since then. The second major flare occurred from Region 6402 at 20:52 UT on 11 December. This flare was rated a class M6.5 x-ray flare, but only attained a very small SB (brilliant subflare) optical class. This flare was accompanied by only weak discrete radio bursts. The most severe terrestrial impact produced by this flare was a moderate intensity, moderate-duration SID/SWF which affected short wave frequencies up to 13 MHz for about 70 minutes over the sunlit portions of the earth. The third major flare was rated a class M5.1 x-ray flare. Like the second flare, this third flare was optically weak. At its peak intensity, it was rated only a meager SF (faint subflare) optical class. The flare originated from Region 6398 at 08:03 UT on 12 December. It's only terrestrial effect was a SID/SWF. The final major flare of the week occurred from Region 6398 on 12 December and was the most significant x-ray flare of the week. This flare attained a class M8.9 x-ray intensity at 14:10 UT, but like the other flares, only attained a weak faint sublare optical intensity. The duration of this flare was a respectable 71 minutes and was associated with a moderate intensity, moderate duration SID/SWF. This was the only significant terrestrial impact observed from this flare. The cluster of regions which produced this weeks activity quickly rotated out of view between 12 December and 14 December. Their disappearance produced a steep decrease in the solar flux. By 14 December, the solar flux had dropped 32 points from 236 on 12 December to 204 on 14 December. This cluster of sunspot activity will begin to return near 26/27 December. Models currently suggest that the active sunspot forming regions will likely remain intact during their transit on the far side of the sun, but magnetic complexity and flaring is expected to drop before it returns near 26/27 December, barring any new developments of complex active regions in that area. M-class flaring will probably still be possible, but major flaring is not too likely. If the models are correct, a moderate to strong increase in the solar flux should accompany the return of these regions back into view between 26 and 28 December. Since the disappearance of the active regions beyond the west limb, attention has been focused primarily on Region 6410 and 6412. Region 6410 had exhibited significant growth and increased flaring earlier this week, but has since shown signs of slight decay and decreased flare output. This region will probably begin a more rapid decay within the next 2 to 4 days. Region 6412 (which was old Region 6368 on its last rotation) is the largest system on the solar disk at the present time. It has retained a relatively complex configuration capable of producing M-class flares. A total of 45 spots are encompassed in this region, which covers an area of near 4,230 million square kilometers (1,650 million square miles). Although old Region 6368 was associated with several magnetically complex areas within it's boundary, it has degenerated and presently consists only of a type Beta magnetic configuration. In all, there were over 17 M-class flares this week, almost all attributed to the active cluster of regions which were in the northwest solar quadrant before rotating out of view this week. Of the regions which were active, Region 6398 was the most active, producing near 50% of the flare activity observed this week. About 40% of the remaining activity was attributed to Region 6399 which showed a dramatic and intensive burst of M-class flaring on 12 December. The remaining 10% was shared by the other less-active regions on the solar disk. This week was full of SID/SWF's. At least 14 SID/SWF's were suspected this week due to the solar flaring. Short-wave radio experienced frequent periods of degraded signal quality during these SWF periods. No significant proton enhancements were observed, despite the increased solar activity. However, the background X-ray flux increased notably during the week to levels near class C2.1. It has since declined to levels near B9.1. SHORT TERM SOLAR TERRESTRIAL FORECAST Solar activity is expected to remain mostly low to moderate over the coming week. The most active regions currently on the solar disk are just passing the central meridian as of 16/17 December and will begin rotating out of view near 22 December. Region 6412, which is the most significant easterly region, will rotate out of view around mid-day on 24 December. Although M-class flaring is possible from Region 6412, no significant major flaring or increases in activity are expected, barring the appearance of any new major active centers. Geomagnetic activity is expected to remain mostly quiet to unsettled this week. Auroral activity will likewise remain quiet and not visible. HF radio propagation conditions are expected to be normal this week, but with an increased risk for SWF's during the local daylight hours. VHF will remain normal this week with no significant opportunities for DX expected. The MUF has decreased by about 10 MHz since the early part of this week, and is expected to decrease further as the week progresses. However, widespread openings on 10 meters should remain possible throughout this week. No significant openings are expected above 50 MHz. SUMMARY OF ALL ACTIVE REGIONS VISIBLE ON THE SOLAR DISK AS OF 17 DECEMBER Region # Location LO Area Class LL Spots Magnetic Type -------- -------- --- ---- ----- -- ----- ------------- 6405 S16W73 103 0000 AXX 00 001 ALPHA 6409 N27W24 054 0060 HRX 01 002 ALPHA 6410 N05W18 048 1320 EAO 15 027 BETA 6412 N17E10 020 4230 FKI 18 045 BETA 6413 N23W03 033 0060 HRX 01 003 ALPHA 6415 N10W05 035 0090 CAO 04 007 BETA 6416 S06E22 008 0060 DRO 03 005 BETA NOTES: Area is in million square kilometers. Angular extent (LL) and solar longitude (LO) are in degree's. For more information regarding the terminology used above, request the Glossary of Solar Terrestrial Terms from: "std_oler@hg.uleth.ca". H-ALPHA PLAGES WITHOUT SPOTS. LOCATIONS VALID AS OF 24:00 UT ON 16 DECEMBER. REGION LOCATION LO COMMENTS (IF ANY) ------ -------- --- ------------------------------- 6406 S27W71 101 NONE 6411 S24W27 057 ACTIVE REGIONS DUE TO RETURN BETWEEN 17 AND 19 DECEMBER Region Latitude Longitude (Helio.) ------ -------- --------- 6394 N06 287 6379 S06 264 6396 S22 262 NOTES: For definitions regarding the above, request the "Glossary of Solar Terrestrial Terms" from "std_oler@hg.uleth.ca". GRAPHICAL ANALYSIS OF RECENT GEOMAGNETIC ACTIVITY - BOULDER COLORADO Cumulative Geomagnetic Activity History Peak Geomagnetic Activity during the past 87 hours _________________________________________________________________ | EXTREMELY SEVERE | | | | | VERY HIGH! | | VERY SEVERE STORM | | | | | HIGH | | SEVERE STORM | | | | | MODERATE | | MAJOR STORM | | | | | MODERATE | | MINOR STORM | | | | | LOW | | VERY ACTIVE | * | | | | NONE - LOW | | ACTIVE |*** |* | | **| NONE | | UNSETTLED |***** *|* * |* * |* ***| NONE | | QUIET |***** **|********|********|*****| NONE | | VERY QUIET |********|********|********|*****| NONE | |-------------------|--------|--------|--------|-----|------------| | Geomagnetic Field | Thu. | Fri. | Sat. | Sun.| Anomaly | | Conditions | Given in 3-hour intervals | Intensity | |_________________________________________________________________| NOTES: This graph ONLY depicts geomagnetic conditions observed at Boulder, Colorado for the past 87 hours. Conditions to the north of Boulder will generally have slightly higher activity than Boulder, while conditions to the south of Boulder will likely have lower activity than those depicted here. However, the plots should present a good approximate average of planetary geomagnetic conditions. For information regarding the interpretation and/or use of these charts, send a request for the document "Understanding Solar Terrestrial Reports" to: std_oler@hg.uleth.ca. PLANETARY 10-DAY GEOMAGNETIC ACTIVITY OUTLOOK (16 DECEMBER - 25 DECEMBER) ________________________________________________________________________ | EXTREMELY SEVERE | | | | | | | | | | | VERY HIGH! | | VERY SEVERE STORM | | | | | | | | | | | HIGH | | SEVERE STORM | | | | | | | | | | | MODERATE | | MAJOR STORM | | | | | | | | | | | MODERATE | | MINOR STORM | | | | | | | | | | | LOW | | VERY ACTIVE | | | | | | | | | | | NONE - LOW | | ACTIVE | | | | | | | | | | | NONE | | UNSETTLED | | *| *| | *| | | *| **| **| NONE | | QUIET |***|***|***|***|***|***|***|***|***|***| NONE | | VERY QUIET |***|***|***|***|***|***|***|***|***|***| NONE | |-------------------|---|---|---|---|---|---|---|---|---|---|------------| | Geomagnetic Field |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| Anomaly | | Conditions | Given in 8-hour intervals | Intensity | |________________________________________________________________________| NOTES: Predicted geomagnetic activity is based heavily on recurrent phenomena. Transient energetic solar events cannot be predicted reliably over periods in excess of several days. Hence, there may be some deviations from the predictions due to the unpredictable transient solar component. GRAPHICAL ANALYSIS OF SOLAR ACTIVITY OVER THE PAST 60 DAYS Cumulative Graphical Analysis of Solar Activity ____________________________________________________________ 249| | MOD. 241| F = Major Flare(s) | MOD. 233| *FFF | MOD. 225| ****FFF | MOD. 217| * * *****FFF* | MOD. 209| * ** *** *****FFF* | MOD. 201| * *** ***** F*****FFF** | MOD. 193|**F ******* ****** *F*****FFF*** | MOD. 186|**F* *************** *F*****FFF****| LOW 178|**F* ***************** **F*****FFF****| LOW 170|**F* ******************** * ****F*****FFF****| LOW 162|**F*** * * ********************* ******F*****FFF****| LOW 154|**F******* ** **********************F*******F*****FFF****| LOW 146|**F********** ***********************F*******F*****FFF****| LOW 138|**F************************************F*******F*****FFF****| LOW ------------------------------------------------------------ Cumulative 60 day Solar Activity Record Start Date: October 18, 1990 NOTES: Left-hand column digits represent the 10.7 cm solar radio flux obtained from Ottawa. The right-hand column describes the relative solar activity for that period based on the average number of major and minor flares that can be expected for related solar flux values. Plot lines labeled with the letter "F" represent days where at least one major flare occurred (ie. class M5 or greater flare). GRAPHICAL 20-DAY SOLAR ACTIVITY PREDICTION Solar Activity _________________________________________________________________ | 250 | | | | | | | | | | | | | | | \ | | | | | | 243 | | | | | | | | | | | | | | | / | | | | | | 236 | | | | | | | | | | | | | | | \ | | | | | | 229 | | | | | | | | | | | | | | | / | | | | | | 223 | | | | | | | | | | | | | | | \**|**| | | | | 216 | | | | | | | | | | | | | |**|**/ | |**| | | | 209 | | | | | | | | | | | | |**| | \ | | |**|**| | 202 | | | | | | | | | | | | | | | / | | | | | | 195 |**|**| | | | | | | | | |**| | | \ | | | | | | 188 | | |**|**| | | | | | | | | | | / | | | | | | 181 | | | | |**| | | | | | | | | | \ | | | | | | 174 | | | | | |**| | | | |**| | | | / | | | | | | 168 | | | | | | |**| | | | | | | | \ | | | | | | 161 | | | | | | | |**| |**| | | | | / | | | | | | 154 | | | | | | | | |**| | | | | | \ | | | | | | 146 | | | | | | | | | | | | | | | / | | | | | |-----|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--\--|--|--|--|--| |Solar|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31/01|02|03|04|05| |Flux | December 1990 \ January 1991 | ----------------------------------------------------------------- HF RADIO SIGNAL PROPAGATION PREDICTIONS (16 DECEMBER - 25 DECEMBER) High Latitude Paths ________________________________________________________ | EXTREMELY GOOD | | | | | | | | | | | | VERY GOOD | | | | | | | | | | | | GOOD |* *|* *|* *|* *|* *|* *|* *|* *| *| *| | FAIR | * | * | * | * | * | * | * | * |** |** | | POOR | | | | | | | | | | | | VERY POOR | | | | | | | | | | | | EXTREMELY POOR | | | | | | | | | | | |----------------|---|---|---|---|---|---|---|---|---|---| | PROPAGATION |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| | QUALITY | Given in 8-Hour UT Intervals | -------------------------------------------------------- Middle Latitude Paths ________________________________________________________ | EXTREMELY GOOD | | | | | | | | | | | | VERY GOOD |* *|* *|* *|* *|* *|* *|***|* *| *| *| | GOOD | * | * | * | * | * | * | | * |** |** | | FAIR | | | | | | | | | | | | POOR | | | | | | | | | | | | VERY POOR | | | | | | | | | | | | EXTREMELY POOR | | | | | | | | | | | |----------------|---|---|---|---|---|---|---|---|---|---| | PROPAGATION |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| | QUALITY | Given in 8-Hour UT Intervals | -------------------------------------------------------- Low Latitude Paths ________________________________________________________ | EXTREMELY GOOD | | | | | | | | | | | | VERY GOOD |***|***|***|* *|* *|***|***|* *|* *|* *| | GOOD | | | | * | * | | | * | * | * | | FAIR | | | | | | | | | | | | POOR | | | | | | | | | | | | VERY POOR | | | | | | | | | | | | EXTREMELY POOR | | | | | | | | | | | |----------------|---|---|---|---|---|---|---|---|---|---| | PROPAGATION |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| | QUALITY | Given in 8-Hour UT Intervals | -------------------------------------------------------- NOTES: High latitudes >= 55 degree's north latitude Middle latitudes >= 40 < 55 degree's north latitude Low latitudes < 40 degree's north latitude POTENTIAL VHF DX PROPAGATION PREDICTIONS (16 DECEMBER - 25 DECEMBER) INCLUDES SID AND AURORAL BACKSCATTER ENHANCEMENT PREDICTIONS HIGH LATITUDES __________________________________________________ ___________________ | SIGNAL | Given in 8 hour local time intervals | | SID ENHANCEMENT | | QUALITY |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| |S|M|T|W|T|F|S|S|M|T| |__________|___|___|___|___|___|___|___|___|___|___| |-|-|-|-|-|-|-|-|-|-| | VERY GOOD| | | | | | | | | | | 0%|*|*|*|*|*|*|*|*|*|*| |ABOVE NORM| | | | | | | | | | | 20%|*|*|*|*|*|*|*|*|*|*| | NORMAL|***|***|***|***|***|***|***|***|***|***| 40%| | | | | | | | | | | |BELOW NORM| | | | | | | | | | | 60%| | | | | | | | | | | | VERY POOR| | | | | | | | | | | 80%| | | | | | | | | | | | BLACKOUT| | | | | | | | | | |100%| | | | | | | | | | | |==========|===|===|===|===|===|===|===|===|===|===| |-------------------| | 100% | | | | | | | | | | |100%| | | | | | | | | | | | 80% | | | | | | | | | | | 80%| | | | | | | | | | | | 60% | | | | | | | | | | | 60%| | | | | | | | | | | | 40% | | | | | | | | | | | 40%| | | | | | | | | | | | 20% | | | | | | |* *|* *|* *|* *| 20%| | | | | | | |*|*|*| | 0% |***|***|***|***|***|***|***|***|***|***| 0%|*|*|*|*|*|*|*|*|*|*| |----------+---|---|---|---|---|---|---|---|---|---| |-|-|-|-|-|-|-|-|-|-| |CHANCE OF |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| |S|M|T|W|T|F|S|S|M|T| | VHF DX | Given in 8 hour local time intervals | |AURORAL BACKSCATTER| |__________|_______________________________________| |___________________| MIDDLE LATITUDES __________________________________________________ ___________________ | SIGNAL | Given in 8 hour local time intervals | | SID ENHANCEMENT | | QUALITY |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| |S|M|T|W|T|F|S|S|M|T| |__________|___|___|___|___|___|___|___|___|___|___| |-|-|-|-|-|-|-|-|-|-| | VERY GOOD| | | | | | | | | | | 0%|*|*|*|*|*|*|*|*|*|*| |ABOVE NORM| | | | | | | | | | | 20%|*|*|*|*|*|*|*|*|*|*| | NORMAL|***|***|***|***|***|***|***|***|***|***| 40%| |*|*|*|*|*|*|*|*|*| |BELOW NORM| | | | | | | | | | | 60%| | | | | | | | | | | | VERY POOR| | | | | | | | | | | 80%| | | | | | | | | | | | BLACKOUT| | | | | | | | | | |100%| | | | | | | | | | | |==========|===|===|===|===|===|===|===|===|===|===| |-------------------| | 100% | | | | | | | | | | |100%| | | | | | | | | | | | 80% | | | | | | | | | | | 80%| | | | | | | | | | | | 60% | | | | | | | | | | | 60%| | | | | | | | | | | | 40% | | * | * | * | * | * | * | * | * | * | 40%| | | | | | | | | | | | 20% | **| **| **| **| **| **| **| **|***|***| 20%| | | | | | | | |*|*| | 0% |***|***|***|***|***|***|***|***|***|***| 0%|*|*|*|*|*|*|*|*|*|*| |----------+---|---|---|---|---|---|---|---|---|---| |-|-|-|-|-|-|-|-|-|-| |CHANCE OF |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| |S|M|T|W|T|F|S|S|M|T| | VHF DX | Given in 8 hour local time intervals | |AURORAL BACKSCATTER| |__________|_______________________________________| |___________________| LOW LATITUDES __________________________________________________ ___________________ | SIGNAL | Given in 8 hour local time intervals | | SID ENHANCEMENT | | QUALITY |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| |S|M|T|W|T|F|S|S|M|T| |__________|___|___|___|___|___|___|___|___|___|___| |-|-|-|-|-|-|-|-|-|-| | VERY GOOD| | | | | | | | | | | 0%|*|*|*|*|*|*|*|*|*|*| |ABOVE NORM| | | | | | | | | | | 20%|*|*|*|*|*|*|*|*|*|*| | NORMAL|***|***|***|***|***|***|***|***|***|***| 40%| |*|*|*|*|*|*|*|*|*| |BELOW NORM| | | | | | | | | | | 60%| | | | | | | | | | | | VERY POOR| | | | | | | | | | | 80%| | | | | | | | | | | | BLACKOUT| | | | | | | | | | |100%| | | | | | | | | | | |==========|===|===|===|===|===|===|===|===|===|===| |-------------------| | 100% | | | | | | | | | | |100%| | | | | | | | | | | | 80% | | | | | | | | | | | 80%| | | | | | | | | | | | 60% | | | | | | | | | | | 60%| | | | | | | | | | | | 40% | * | * | * | * | * | * | * | * | * | * | 40%| | | | | | | | | | | | 20% | **| **| **| **| **| **| **| **| **| **| 20%| | | | | | | | | | | | 0% |***|***|***|***|***|***|***|***|***|***| 0%|*|*|*|*|*|*|*|*|*|*| |----------+---|---|---|---|---|---|---|---|---|---| |-|-|-|-|-|-|-|-|-|-| |CHANCE OF |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| |S|M|T|W|T|F|S|S|M|T| | VHF DX | Given in 8 hour local time intervals | |AURORAL BACKSCATTER| |__________|_______________________________________| |___________________| NOTES: These VHF DX prediction charts are defined for the 50 MHz to 220 MHz bands. They are based primarily on phenomena which can affect VHF DX propagation globally. They should be used only as a guide to potential DX conditions on VHF bands. Latitudinal boundaries are the same as those for the HF predictions charts. For more information, request the document "Understanding Solar Terrestrial Reports" from: "std_oler@hg.uleth.ca". AURORAL ACTIVITY PREDICTIONS (16 DECEMBER - 25 DECEMBER) High Latitude Locations ________________________________________________________ | EXTREMELY HIGH | | | | | | | | | | | | VERY HIGH | | | | | | | | | | | | HIGH | | | | | | | | | | | | MODERATE | | | | | | | | | | | | LOW | | | | | | | | * | * |***| | NOT VISIBLE |***|***|***|***|***|***|***|***|***|***| |----------------|---|---|---|---|---|---|---|---|---|---| | AURORAL |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| | INTENSITY | Eve.Twilight/Midnight/Morn.Twilight | -------------------------------------------------------- Middle Latitude Locations ________________________________________________________ | EXTREMELY HIGH | | | | | | | | | | | | VERY HIGH | | | | | | | | | | | | HIGH | | | | | | | | | | | | MODERATE | | | | | | | | | | | | LOW | | | | | | | | | | * | | NOT VISIBLE |***|***|***|***|***|***|***|***|***|***| |----------------|---|---|---|---|---|---|---|---|---|---| | AURORAL |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| | INTENSITY | Eve.Twilight/Midnight/Morn.Twilight | -------------------------------------------------------- Low Latitude Locations ________________________________________________________ | EXTREMELY HIGH | | | | | | | | | | | | VERY HIGH | | | | | | | | | | | | HIGH | | | | | | | | | | | | MODERATE | | | | | | | | | | | | LOW | | | | | | | | | | | | NOT VISIBLE |***|***|***|***|***|***|***|***|***|***| |----------------|---|---|---|---|---|---|---|---|---|---| | AURORAL |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| | INTENSITY | Eve.Twilight/Midnight/Morn.Twilight | -------------------------------------------------------- NOTE: For more information regarding these charts, send a request for the document, "Understanding Solar Terrestrial Reports" to: std_oler@hg.uleth.ca. ** End of Report ** ------------------------------ End of SPACE Digest V12 #707 *******************