Viewing archive of tisdag, 18 augusti 1998
Solaktivitetsrapport
Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Rapport för sol- och geofysisk aktivitet 1998 Aug 18 2200 UTCSkapad av NOAA © SWPC och bearbetad av SpaceWeatherLive.com
USAF/NOAA rapport för sol- och geofysisk aktivitet
SDF Nummer 230 publicerat klockan 2200Z på 18 AUG 1998IA. Analys av solfläcksgrupper och solaktivitet från 17-2100Z till 18-2100Z SOLAR ACTIVITY HAS BEEN HIGH. TWO X LEVEL (1.2 AT
17/2120UT AND 2.8 AT 18/0818UT)AND ONE M LEVEL (1.5 AT 18/0414UT)
X-RAY EVENTS HAVE OCCURRED IN THE LAST 24 HOURS. THEY ARE BEING
ASSOCIATED WITH REGION 8307 (N30E77) WHICH IS IN THE PROCESS OF
CROSSING THE LIMB. OPTICAL AND X-RAY SENSORS HAVE SHOWN CORONAL
LOOPS AND RAIN AS WELL AS ACTIVE SURGES AND BRIGHTENINGS. A SINGLE
SPOT HAS COME OVER THE LIMB AT TIME OF ISSUE, BUT OF UNKNOWN TYPE.
SUB-FAINT FLARES HAVE OCCURRED IN REGIONS 8297 (N32W80) AND 8299
(N16W69). A TYPE IV AND 10CM BURST WERE ASSOCIATED WITH THE X2.8
FLARE WHICH OCCURRED AT 0818UT. NO PARTICLE, PCA, OR GLE EVENTS
HAVE TAKEN PLACE, AND THEY ARE NOT EXPECTED TO OCCUR.
IB. Prognos för solaktivitet
SOLAR ACTIVITY IS EXPECTED TO BE
MODERATE TO HIGH.
IIA. Sammanfattning av geofysisk aktivitet 17-2100Z till 18-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET. A CORONAL HOLE WHICH EXTENDS
FROM THE NORTHERN POLE TO ALMOST N30 IS BELIEVED TO BE MOVING ACROSS
THE CENTRAL MERIDIAN AND INTO A GEOEFFECTIVE POSITION. THREE DSFS
OCCURRED IN THE LAST 24 HOURS. THE SIZES AND LOCATIONS WERE 9 DEG
AT S30E22 ENDING AT 17/2332, 15 DEG AT N44W38 ENDING AT 17/2332, AND
10 DEG AT S51E16 ENDING AT 18/1150. THESE COMBINED WITH AN EXPECTED
HIGH SPEED STREAM ARE CAUSE FOR EXPECTING HIGHER GEOMAGNETIC
ACTIVITY IN THE NEXT 3 DAYS.
IIB. Prognos för geofysisk aktivitet
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE WITH ISOLATED MINOR STORM
CONDITIONS AT HIGHER LATITUDES NEAR THE END OF THE DAY AND LATER IN
THE PERIOD.
III. Chans för solutbrott från 19 AUG till 21 AUG
| M-klass | 75% | 75% | 75% |
| X-klass | 25% | 30% | 30% |
| Proton | 10% | 10% | 15% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observerad 18 AUG 133 Prognoserat 19 AUG-21 AUG 140/140/145 90 Day Mean 18 AUG 114
V. Geomagnetiskt A-index
OBSERVED AFR/AP 17 AUG 001/005 ESTIMATED AFR/AP 18 AUG 005/010 PREDICTED AFR/AP 19 AUG-21 AUG 010/015-015/020-020/020
VI. Chanser för geomagnetisk aktivitet från 19 AUG till 21 AUG
| A. Medelhöga breddgrader | |||
|---|---|---|---|
| Aktivt | 10% | 20% | 20% |
| Små stormförhållanden | 05% | 10% | 10% |
| Svåra stormförhållanden | 01% | 05% | 05% |
| B. Höga breddgrader | |||
|---|---|---|---|
| Aktivt | 15% | 25% | 25% |
| Små stormförhållanden | 05% | 10% | 15% |
| Svåra stormförhållanden | 01% | 05% | 05% |
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