Viewing archive of torsdag, 18 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 18 2200 UTCSkapad av NOAA © SWPC och bearbetad av SpaceWeatherLive.com
USAF/NOAA rapport för sol- och geofysisk aktivitet
SDF Nummer 049 publicerat klockan 2200Z på 18 FEB 1999IA. Analys av solfläcksgrupper och solaktivitet från 17-2100Z till 18-2100Z SOLAR ACTIVITY WAS LOW. THE DAY'S LARGEST EVENT WAS A
C5 XRAY BURST AT 0329Z. THERE WAS NO ASSOCIATED OPTICAL FLARE.
REGION 8462 (N20W40) PRODUCED MOST OF THE C-CLASS EVENTS OBSERVED,
AND REGIONS 8458 (S23W36) AND 8459 (S29W80) SPLIT THE REMAINDER. IN
GENERAL, ALL SPOTTED REGIONS WERE STABLE OR DECAYING AND THE 10.7 CM
RADIO FLUX DROPPED SUBSTANTIALLY FROM YESTERDAY. THE LIMBS WERE
QUIET.
IB. Prognos för solaktivitet
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGIONS 8458 AND 8462 ARE POTENTIAL SITES FOR M-CLASS
ACTIVITY, SHOULD AN INSTABILITY DEVELOP.
IIA. Sammanfattning av geofysisk aktivitet 17-2100Z till 18-2100Z
THE GEOMAGNETIC FIELD WAS AT ACTIVE TO SEVERE STORM LEVELS THROUGHOUT
THE PERIOD. A SUDDEN STORM COMMENCEMENT MEASURING 43 NANOTESLAS AT
BOULDER, OCCURRED AT 0250Z. THE ACE SPACECRAFT MEASURED SOLAR WIND
VELOCITIES NEAR 700 KM/S, AND SOUTHWARD IMF OF APPROXIMATELY 20 NT,
FOR HOURS FOLLOWING THE PASSAGE OF THE SHOCK. THE SOLAR ORIGIN OF
THIS ACTIVITY IS THOUGHT TO BE THE LONG-DURATION M-CLASS EVENT FROM
NEAR CENTER DISK, EARLY ON FEBRUARY 16. A FORBUSH DECREASE BEGAN
EARLY IN THE DAY, AS SEEN IN NEUTRON MONITOR DATA.
IIB. Prognos för geofysisk aktivitet
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT ACTIVE TO MINOR STORM LEVELS FOR THE NEXT 24
HOURS. THE CURRENT STORM SHOULD GRADUALLY WEAKEN, ALTHOUGH EPISODES
OF MAJOR STORM MAY OCCUR DURING LOCAL NIGHTTIMES. THE SOLAR WIND
SPEED AT ACE IS STILL ABOVE 600 KM/S, BUT THE SOUTHWARD COMPONENT OF
THE IMF IS NOW NEAR ZERO. THE RETURN TO MORE BENIGN CONDITIONS
SHOULD BRING QUIET TO UNSETTLED LEVELS BY FEBRUARY 21.
III. Chans för solutbrott från 19 FEB till 21 FEB
| M-klass | 50% | 50% | 50% |
| X-klass | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observerad 18 FEB 168 Prognoserat 19 FEB-21 FEB 160/155/150 90 Day Mean 18 FEB 146
V. Geomagnetiskt A-index
OBSERVED AFR/AP 17 FEB 015/016 ESTIMATED AFR/AP 18 FEB 060/050 PREDICTED AFR/AP 19 FEB-21 FEB 030/030-015/015-005/010
VI. Chanser för geomagnetisk aktivitet från 19 FEB till 21 FEB
| A. Medelhöga breddgrader | |||
|---|---|---|---|
| Aktivt | 10% | 40% | 10% |
| Små stormförhållanden | 60% | 20% | 05% |
| Svåra stormförhållanden | 25% | 05% | 01% |
| B. Höga breddgrader | |||
|---|---|---|---|
| Aktivt | 10% | 50% | 20% |
| Små stormförhållanden | 60% | 30% | 10% |
| Svåra stormförhållanden | 30% | 10% | 01% |
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