Return-path: X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson Received: from hogtown.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 ; Fri, 12 Apr 91 01:37:40 -0400 (EDT) Message-ID: Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Fri, 12 Apr 91 01:37:34 -0400 (EDT) Subject: SPACE Digest V13 #396 SPACE Digest Volume 13 : Issue 396 Today's Topics: Administrivia: Submissions to the SPACE Digest/sci.space should be mailed to space+@andrew.cmu.edu. Other mail, esp. [un]subscription requests, should be sent to space-request+@andrew.cmu.edu, or, if urgent, to tm2b+@andrew.cmu.edu ---------------------------------------------------------------------- Date: Thu, 11 Apr 91 14:35:11 EDT From: oler%HG.ULeth.CA@BITNET.CC.CMU.EDU Eceived: from HG.ULeth.CA by Ucnet.UCalgary.CA via DECNET ; Thu, 11 Apr 91 02:49:31 MDT Ate: Thu, 11 Apr 91 02:49:13 MDT Rom: oler <@BITNET.CC.CMU.EDU:oler@HG.ULeth.CA> (CARY OLER) Ubject: SOLAR TERRESTRIAL FORECAST AND REVIEW O: space+@ANDREW.CMU.EDU Essage-Id: <910411024913.23e03d74@HG.ULeth.CA> -St-Vmsmail-To: st%"space+@andrew.cmu.edu" Apparently-To:  --- SOLAR TERRESTRIAL FORECAST AND REVIEW --- April 10 to April 20, 1991 Report Based In-Part from Data Obtained from the Space Environment Services Center Boulder Colorado -------- SOLAR TERRESTRIAL REVIEW FOR 31 MARCH TO 10 APRIL Solar activity during the period from 31 March to 10 April was high to low. Region 6555 managed to spawn several major flares shortly before it disappeared behind the eastern limb on 31 March/01 April. On 02 April, Region 6562 spawned an M6.1/3B flare at 23:27 UT. This major flare was associated with a strong Type IV sweep emission and was associated with a SID/SWF. The optical counterpart of this flare was also impressive, exhibiting a significant loop prominence system. Parallel ribbons were also observed with this flare. Since 02 April, solar activity became dormant. No M-class flares were observed until late in the period. On 09 April, a weak class M1.0/1B flare was observed from Region 6566 at 18:49 UT. Region 6566 was a small bipolar region with very little complexity. However, new flux emergence within this region increased activity and is believed responsible for producing the M-class flare. A satellite proton event at greater than 10 MeV began at 08:15 UT on 03 April and reached a peak flux of 52 pfu on 04 April. A Polar Cap Absorption (PCA) event began at 08:45 UT on 04 April and reached a peak absorption level of 2.2 dB's before ending shortly thereafter at 17:50 UT on 04 April. The major class M6.1/3B flare of 02 April is believed responsible for these events. The proton event decayed thereafter and ended at 06:45 UT on 06 April. The geomagnetic field was at mostly unsettled to active levels throughout the period. The only significant exception was on 04 April when all latitudes experienced several periods of major geomagnetic storming, most likely caused by the major class M6.1/3B flare of 02 April. Since 04 April, geomagnetic conditions have been generally unsettled with isolated periods of active conditions being observed over all latitudes. An impressive display of auroral activity was observed on 04 April, coincident with the sudden increase in geomagnetic activity due to the major flare of 02 April. The activity was relatively short-lived, however. The most intense activity was observed shortly after the SSC on 04 April for several hours. Activity was not intense enough to be viewed over the lower latitudes, although some isolated and unconfirmed reports of possible very weak auroral activity was reported from a few low latitude stations on 04 April. Continual low to moderate auroral activity has been observed over the northerly middle and high latitudes. Coronal-induced activity is most likely the cause of this prolonged geomagnetic and auroral activity over these regions. HF radio propagation conditions have been generally good throughout the period. The exception is 04 April, when some degradation was observed over all latitudes. Sporadic and isolated substorm activity has produced localized degraded conditions over several middle and low latitude regions recently, particularly over the southern hemispheric regions. Some isolated VHF auroral backscatter communications were reported on 04 April, coincident with the increased geomagnetic and auroral activity. Since then, conditions have been unfavorable for auroral communications on the VHF bands. SID enhancements were not possible due to the dormant nature of the solar activity since 03 April. SHORT TERM SOLAR TERRESTRIAL FORECAST Solar activity is on the rise again. There are many small and relatively inactive regions on the surface of the sun at the present time. Region 6583 (N10E73 on 11 April) just recently rotated into view from the east limb and is proving the be the most energetic region visible. It has produced several low-level M-class flares lately. The two most recent occurred at 03:44 UT and 20:30 UT on 10 April, reaching classes M1.3/1N and M1.9/SF ratings respectively. This region also produced a weak Type II sweep, apparently associated with a weak subflare. Region 6583 is still too near to the eastern limb to discern any significant detail. However, it appears to be a relatively small region with a slight amount of complexity associated with it. It is expected to continue to develope and evolve, and does not appear capable of producing any major flaring at the present time. Region 6555 (the potent region which produced the plethora of X-class flares late in March and was also responsible for the major geomagnetic storm on 24-26 March) is due to return on 13 April. There is a possibility this region could return in a form capable of producing occassional M-class flaring. However, we believe that this region has probably decayed to the point where flaring should be weak and of little significance. The east limb will be monitored closely for the return of this region. Geomagnetic activity is expected to remain at generally quiet to unsettled levels over the next three days. An increase to unsettled to active levels is possible beginning on 13 April, due to recurrent activity and an expected reversal in the direction of the interplanetary magnetic field. A southward directed field is expected to materialize over the next several days (if it hasn't already materialized). Increased geomagnetic instability is expected to occur thereafter. No middle latitude storming is expected this week, barring any significant solar activity. Auroral activity should become relatively dormant over the next week, except over the high latitudes where low level auroral activity should persist, mixed in with isolated periods of moderate activity. Some northerly middle latitude areas should witness this weak auroral activity low over the northern horizon under a dark sky. Activity should become slightly enhanced beginning on or near 13 April due to recurrent solar corpuscular emissions and also due in part to the expected change in interplanetary magnetic field direction. SUMMARY OF ALL ACTIVE REGIONS VISIBLE ON THE SOLAR DISK AS OF 11 APRIL Region # Location LO Area Class LL Spots Magnetic Type -------- -------- --- ---- ----- -- ----- ------------- 6565 N09W82 037 0270 HSX 02 002 ALPHA 6566 S21W35 350 0270 DAO 10 021 BETA 6567 S11W44 359 0000 AXX 00 001 ALPHA 6568 S12W34 349 0060 CRO 04 005 BETA 6569 N05W16 331 0300 HSX 02 001 ALPHA 6570 S11W20 335 0030 BXO 04 004 BETA 6572 S20W71 026 0480 DAO 08 007 BETA 6577 N09W21 338 0030 AXX 01 001 ALPHA 6578 S19E07 308 0030 BXO 04 003 BETA 6579 N06E07 308 0060 CRO 05 005 BETA 6580 N29E28 287 0690 DAO 05 011 BETA 6581 N15E46 269 0090 CRO 06 003 BETA 6582 S25E57 258 0300 CSO 08 010 BETA 6583 N10E73 242 0660 CAO 04 007 BETA 6584 S13W55 010 0030 BXO 03 003 BETA 6585 S26E45 270 0000 AXX 00 001 ALPHA 6586 S25W10 325 0030 BXO 05 005 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: "oler@hg.uleth.ca". H-ALPHA PLAGES WITHOUT SPOTS. LOCATIONS VALID AS OF 00:00 UT ON 11 APRIL REGION LOCATION LO COMMENTS (IF ANY) ------ -------- --- ------------------------------- 6573 S51W68 023 NONE 6575 S08W59 014 ACTIVE REGIONS DUE TO RETURN BETWEEN 11 APRIL AND 13 APRIL Region Latitude Longitude (Helio.) ------ -------- --------- 6555 S24 186 6556 S12 191 NOTES: For definitions regarding the above, request the "Glossary of Solar Terrestrial Terms" from "oler@hg.uleth.ca". GRAPHICAL ANALYSIS OF RECENT PLANETARY (GLOBAL) GEOMAGNETIC ACTIVITY Cumulative Geomagnetic Activity History Peak Planetary Geomagnetic Activity during the past 96 hours ____________________________________________________________________ | EXTREMELY SEVERE | | | | | HIGH | | VERY SEVERE STORM | | | | | HIGH | | SEVERE STORM | | | | | MODERATE | | MAJOR STORM | | | | | LOW - MOD. | | MINOR STORM | | | | | LOW | | VERY ACTIVE | | | | * | NONE | | ACTIVE |*** * | ** | ****** | **** | NONE | | UNSETTLED |********|********|********|********| NONE | | QUIET |********|********|********|********| NONE | | VERY QUIET |********|********|********|********| NONE | |-------------------|--------|--------|--------|--------|------------| | Geomagnetic Field | Sun. | Mon. | Tue. | Wed. | Anomaly | | Conditions | Given in 3-hourly UT intervals | Intensity | |____________________________________________________________________| NOTES: The data above represents planetary geomagnetic activity. Data from many magnetic observatories around the world are used in constructing the above chart. The first graph line for each day represents geomagnetic activity which occurred between 00 UT and 03 UT. The second graph line represents activity which occurred between 03 UT and 06 UT, etc. For information regarding the interpretation and/or use of these charts, send a request for the document "Understanding Solar Terrestrial Reports" to: oler@hg.uleth.ca. PLANETARY 10-DAY GEOMAGNETIC ACTIVITY OUTLOOK (11 APRIL - 20 APRIL) ________________________________________________________________________ | EXTREMELY SEVERE | | | | | | | | | | | HIGH | | VERY SEVERE STORM | | | | | | | | | | | HIGH | | SEVERE STORM | | | | | | | | | | | MODERATE | | MAJOR STORM | | | | | | | | | | | LOW - MOD. | | MINOR STORM | | | | | | | | | | | LOW | | VERY ACTIVE | | | | | | | | | | | NONE | | ACTIVE | | | | | | | | * |** |** | NONE | | UNSETTLED | * | * |***|***|***|***|***|***|***|***| NONE | | QUIET |***|***|***|***|***|***|***|***|***|***| NONE | | VERY QUIET |***|***|***|***|***|***|***|***|***|***| NONE | |-------------------|---|---|---|---|---|---|---|---|---|---|------------| | Geomagnetic Field |Thu|Fri|Sat|Sun|Mon|Tue|Wed|Thu|Fri|Sat| Anomaly | | Conditions | Given in 8-hour intervals | Intensity | |________________________________________________________________________| CONFIDENCE LEVEL: 70% 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 ____________________________________________________________ 310| *F | HIGH 300| ****F F = Major Flare(s) | HIGH 289| ****F | HIGH 279| *****F | HIGH 269| *****F* F | HIGH 258| *******F* FF F * | HIGH 248| *******F** FFFFFFF * | Moderate 237| *******F** FF*FFFFFFF *F | Moderate 227| *******F*** F FFF*FFFFFFFF*FF | Moderate 217| *******F**** F ***FFF*FFFFFFFF*FF *| Moderate 206| *********F******FF*FF***FFF*FFFFFFFF*FF *| Moderate 196| *********F******FF*FF***FFF*FFFFFFFF*FF** * *** **| Moderate 185| *************F******FF*FF***FFF*FFFFFFFF*FF**F*F*F***** **| Low 175|***************F******FF*FF***FFF*FFFFFFFF*FF**F*F*F********| Low 165|***************F******FF*FF***FFF*FFFFFFFF*FF**F*F*F********| Low ------------------------------------------------------------ Cumulative 60 day Solar Activity Record Start Date: February 10, 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 _________________________________________________________________ | 260 | | | | | | | | | | | | | | | | | | | | | | 255 | | | | | | | |**|**| | | | | | | | | | | | | 250 | | | | | |**|**| | |**|**| | | | | | | | | | | 245 | | | |**|**| | | | | | |**|**| | | | | | | | | 240 | | |**| | | | | | | | | | |**| | | | | | | | 235 | |**| | | | | | | | | | | | |**| | | | | | | 230 |**| | | | | | | | | | | | | | |**| | | | | | 225 | | | | | | | | | | | | | | | | |**| | | | | 220 | | | | | | | | | | | | | | | | | |**| | | | 215 | | | | | | | | | | | | | | | | | | |**| | | 210 | | | | | | | | | | | | | | | | | | | |**| | 205 | | | | | | | | | | | | | | | | | | | | | | 200 | | | | | | | | | | | | | | | | | | | | | |-----|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--| |Solar|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|01| |Flux | April | ----------------------------------------------------------------- CONFIDENCE LEVEL: 60% HF RADIO SIGNAL PROPAGATION PREDICTIONS (11 APRIL - 20 APRIL) High Latitude Paths ________________________________________________________ | EXTREMELY GOOD | | | | | | | | | | | | VERY GOOD | | | | | | | | | | | CONFIDENCE | GOOD | | | | | | | | | | | LEVEL | FAIR |***|***|***|***|***|***|* *|* *|* *| *| ------- | POOR | | | | | | | * | * | * |** | 65% | VERY POOR | | | | | | | | | | | | EXTREMELY POOR | | | | | | | | | | | |----------------|---|---|---|---|---|---|---|---|---|---| | PROPAGATION |Thu|Fri|Sat|Sun|Mon|Tue|Wed|Thu|Fri|Sat| | QUALITY | Given in 8-Hour UT Intervals | -------------------------------------------------------- Middle Latitude Paths ________________________________________________________ | EXTREMELY GOOD | | | | | | | | | | | | VERY GOOD | | | | | | | | | | | CONFIDENCE | GOOD |***|***|***|***|***|***|* *|* *|* *|* *| LEVEL | FAIR | | | | | | | * | * | * | * | ------- | POOR | | | | | | | | | | | 65% | VERY POOR | | | | | | | | | | | | EXTREMELY POOR | | | | | | | | | | | |----------------|---|---|---|---|---|---|---|---|---|---| | PROPAGATION |Thu|Fri|Sat|Sun|Mon|Tue|Wed|Thu|Fri|Sat| | QUALITY | Given in 8-Hour UT Intervals | -------------------------------------------------------- Low Latitude Paths ________________________________________________________ | EXTREMELY GOOD | | | | | | | | | | | | VERY GOOD | *| *| *| | | | | | | | CONFIDENCE | GOOD |** |** |** |***|***|***|***|***|* *|* *| LEVEL | FAIR | | | | | | | | | * | * | ------- | POOR | | | | | | | | | | | 70% | VERY POOR | | | | | | | | | | | | EXTREMELY POOR | | | | | | | | | | | |----------------|---|---|---|---|---|---|---|---|---|---| | PROPAGATION |Thu|Fri|Sat|Sun|Mon|Tue|Wed|Thu|Fri|Sat| | 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 (11 APRIL - 20 APRIL) INCLUDES SID AND AURORAL BACKSCATTER ENHANCEMENT PREDICTIONS HIGH LATITUDES __________________________________________________ ___________________ | SIGNAL | Given in 8 hour local time intervals | | SID ENHANCEMENT | | QUALITY |Thu|Fri|Sat|Sun|Mon|Tue|Wed|Thu|Fri|Sat| |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 |Thu|Fri|Sat|Sun|Mon|Tue|Wed|Thu|Fri|Sat| |T|F|S|S|M|T|W|T|F|S| | VHF DX | Given in 8 hour local time intervals | |AURORAL BACKSCATTER| |__________|_______________________________________| |___________________| MIDDLE LATITUDES __________________________________________________ ___________________ | SIGNAL | Given in 8 hour local time intervals | | SID ENHANCEMENT | | QUALITY |Thu|Fri|Sat|Sun|Mon|Tue|Wed|Thu|Fri|Sat| |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 |Thu|Fri|Sat|Sun|Mon|Tue|Wed|Thu|Fri|Sat| |T|F|S|S|M|T|W|T|F|S| | VHF DX | Given in 8 hour local time intervals | |AURORAL BACKSCATTER| |__________|_______________________________________| |___________________| LOW LATITUDES __________________________________________________ ___________________ | SIGNAL | Given in 8 hour local time intervals | | SID ENHANCEMENT | | QUALITY |Thu|Fri|Sat|Sun|Mon|Tue|Wed|Thu|Fri|Sat| |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 |Thu|Fri|Sat|Sun|Mon|Tue|Wed|Thu|Fri|Sat| |T|F|S|S|M|T|W|T|F|S| | VHF DX | Given in 8 hour local time intervals | |AURORAL BACKSCATTER| |__________|_______________________________________| |___________________| NOTES: These VHF DX prediction charts are defined for the 50 MHz to 150 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: "oler@hg.uleth.ca". AURORAL ACTIVITY PREDICTIONS (11 APRIL - 20 APRIL) High Latitude Locations ________________________________________________________ | EXTREMELY HIGH | | | | | | | | | | | CONFIDENCE | VERY HIGH | | | | | | | | | | | LEVEL | HIGH | | | | | | | | | | | ------- | MODERATE | | | * | * | * | * |***|***|***|***| 75% | LOW |***|***|***|***|***|***|***|***|***|***| | NOT VISIBLE |***|***|***|***|***|***|***|***|***|***| |----------------|---|---|---|---|---|---|---|---|---|---| | AURORAL |Thu|Fri|Sat|Sun|Mon|Tue|Wed|Thu|Fri|Sat| | INTENSITY | Eve.Twilight/Midnight/Morn.Twilight | -------------------------------------------------------- Middle Latitude Locations ________________________________________________________ | EXTREMELY HIGH | | | | | | | | | | | CONFIDENCE | VERY HIGH | | | | | | | | | | | LEVEL | HIGH | | | | | | | | | | | ------- | MODERATE | | | | | | | | | * | * | 75% | LOW | * | * | * | * | * | * |***|***|***|***| | NOT VISIBLE |***|***|***|***|***|***|***|***|***|***| |----------------|---|---|---|---|---|---|---|---|---|---| | AURORAL |Thu|Fri|Sat|Sun|Mon|Tue|Wed|Thu|Fri|Sat| | INTENSITY | Eve.Twilight/Midnight/Morn.Twilight | -------------------------------------------------------- Low Latitude Locations ________________________________________________________ | EXTREMELY HIGH | | | | | | | | | | | CONFIDENCE | VERY HIGH | | | | | | | | | | | LEVEL | HIGH | | | | | | | | | | | ------- | MODERATE | | | | | | | | | | | 90% | LOW | | | | | | | | | | | | NOT VISIBLE |***|***|***|***|***|***|***|***|***|***| |----------------|---|---|---|---|---|---|---|---|---|---| | AURORAL |Thu|Fri|Sat|Sun|Mon|Tue|Wed|Thu|Fri|Sat| | INTENSITY | Eve.Twilight/Midnight/Morn.Twilight | -------------------------------------------------------- NOTE: For more information regarding these charts, send a request for the document, "Understanding Solar Terrestrial Reports" to: oler@hg.uleth.ca. ** End of Report ** ------------------------------ End of SPACE Digest V13 #396 *******************