Viewing archive of söndag, 18 april 1999
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 1999 Apr 18 2200 UTCSkapad av NOAA © SWPC och bearbetad av SpaceWeatherLive.com
USAF/NOAA rapport för sol- och geofysisk aktivitet
SDF Nummer 108 publicerat klockan 2200Z på 18 APR 1999IA. Analys av solfläcksgrupper och solaktivitet från 17-2100Z till 18-2100Z SOLAR ACTIVITY REMAINED AT VERY LOW LEVELS. ISOLATED
B-CLASS X-RAY FLARES OCCURRED, TWO OF WHICH WERE OPTICALLY TIED TO
REGION 8514 (S33W69). THIS REGION SHOWED GRADUAL DECAY AS IT
APPROACHED THE WEST LIMB. ALL THE REMAINING REGIONS WERE EITHER
STABLE OR DECLINING SLOWLY. A 21-DEGREE FILAMENT, LAST SEEN CENTERED
NEAR N19E03, DISAPPEARED EARLY IN THE PERIOD. A PARTIAL-HALO CME WAS
OBSERVED AROUND 17/0600Z. NO NEW REGIONS WERE ASSIGNED.
IB. Prognos för solaktivitet
SOLAR ACTIVITY IS EXPECTED TO REMAIN
AT VERY LOW LEVELS.
IIA. Sammanfattning av geofysisk aktivitet 17-2100Z till 18-2100Z
THE GEOMAGNETIC FIELD WAS MOSTLY QUIET WITH BRIEF UNSETTLED INTERVALS
AT ALL LATITUDES.
IIB. Prognos för geofysisk aktivitet
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT QUIET TO UNSETTLED LEVELS DURING THE FIRST TWO
DAYS, THEN INCREASE TO ACTIVE LEVELS ON THE THIRD DAY IN RESPONSE TO
THE CME MENTIONED ABOVE.
III. Chans för solutbrott från 19 APR till 21 APR
| M-klass | 10% | 10% | 10% |
| X-klass | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observerad 18 APR 113 Prognoserat 19 APR-21 APR 110/110/110 90 Day Mean 18 APR 134
V. Geomagnetiskt A-index
OBSERVED AFR/AP 17 APR 030/047 ESTIMATED AFR/AP 18 APR 008/010 PREDICTED AFR/AP 19 APR-21 APR 005/008-010/012-020/015
VI. Chanser för geomagnetisk aktivitet från 19 APR till 21 APR
| A. Medelhöga breddgrader | |||
|---|---|---|---|
| Aktivt | 10% | 15% | 50% |
| Små stormförhållanden | 05% | 05% | 10% |
| Svåra stormförhållanden | 01% | 01% | 05% |
| B. Höga breddgrader | |||
|---|---|---|---|
| Aktivt | 15% | 20% | 50% |
| Små stormförhållanden | 10% | 10% | 20% |
| Svåra stormförhållanden | 01% | 01% | 05% |
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