Viewing archive of onsdag, 17 februari 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 Feb 17 2200 UTCSkapad av NOAA © SWPC och bearbetad av SpaceWeatherLive.com
USAF/NOAA rapport för sol- och geofysisk aktivitet
SDF Nummer 048 publicerat klockan 2200Z på 17 FEB 1999IA. Analys av solfläcksgrupper och solaktivitet från 16-2100Z till 17-2100Z SOLAR ACTIVITY WAS LOW. OCCASIONAL C-CLASS FLARES MADE
UP THE DAY'S ACTIVITY, THE LARGEST BEING AN UNOBSERVED C6 AT
2029Z.REGION 8462 (N20W27) HAD THE VAST MAJORITY OF THE ASSOCIATED
FLARE ACTIVITY, WITH ITS LARGEST A C5/1N WITH TYPE II SWEEP AT
16/2121Z. REGION 8458 (S23W36) HAD ONLY A FEW C-CLASS FLARES. REGION
8457 (N15W42), ALTHOUGH QUIET, REMAINS BRIGHT IN H-ALPHA. THE
REMAINDER OF THE DISK AND LIMBS WERE QUIET.
IB. Prognos för solaktivitet
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGIONS 8457, 8458 AND 8462 RETAIN THE POTENTIAL FOR
ISOLATED M-CLASS FLARES.
IIA. Sammanfattning av geofysisk aktivitet 16-2100Z till 17-2100Z
THE GEOMAGNETIC FIELD WAS AT QUIET TO MINOR STORM LEVELS. A TRANSIENT
STRUCTURE WAS SEEN TO PASS ACE AROUND 0500Z, WITH ELEVATED SPEED AND
PROLONGED SOUTHWARD BZ. CONDITIONS HAVE SINCE STABILIZED WITH
NOMINAL CONDITIONS NOW OCCURRING. THIS TRANSIENT MAY BE AN EFFECT OF
SOLAR ACTIVITY ON FEBRUARY 12.
IIB. Prognos för geofysisk aktivitet
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE GENERALLY UNSETTLED FOR THE NEXT THREE DAYS. THERE IS
A CHANCE FOR EPISODES OF ELEVATED ACTIVITY IN THE FIRST TWO DAYS,
DUE TO SOLAR ACTIVITY FROM REGION 8458 EARLY ON FEBRUARY 16.
III. Chans för solutbrott från 18 FEB till 20 FEB
| M-klass | 50% | 50% | 50% |
| X-klass | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observerad 17 FEB 190 Prognoserat 18 FEB-20 FEB 185/175/165 90 Day Mean 17 FEB 146
V. Geomagnetiskt A-index
OBSERVED AFR/AP 16 FEB 003/004 ESTIMATED AFR/AP 17 FEB 015/015 PREDICTED AFR/AP 18 FEB-20 FEB 015/010-015/010-010/008
VI. Chanser för geomagnetisk aktivitet från 18 FEB till 20 FEB
| A. Medelhöga breddgrader | |||
|---|---|---|---|
| Aktivt | 40% | 40% | 30% |
| Små stormförhållanden | 20% | 20% | 10% |
| Svåra stormförhållanden | 05% | 05% | 05% |
| B. Höga breddgrader | |||
|---|---|---|---|
| Aktivt | 50% | 50% | 40% |
| Små stormförhållanden | 25% | 25% | 20% |
| Svåra stormförhållanden | 10% | 10% | 05% |
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