Viewing archive of fredag, 30 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 30 2200 UTCSkapad av NOAA © SWPC och bearbetad av SpaceWeatherLive.com
USAF/NOAA rapport för sol- och geofysisk aktivitet
SDF Nummer 120 publicerat klockan 2200Z på 30 APR 1999IA. Analys av solfläcksgrupper och solaktivitet från 29-2100Z till 30-2100Z SOLAR ACTIVITY WAS LOW. CONTINUING DEVELOPMENT IN
REGION 8524 (N21W28) RESULTED IN ITS MERGER WITH NEARBY REGION 8522,
FORMING ONE LARGE BIPOLE. REGION 8524 PRODUCED A NUMBER OF C-CLASS
EVENTS, THE LARGEST BEING A C8/1F FLARE AT 1221Z. ONE NEW REGION,
8527 (N27E68), ROTATED FULLY INTO VIEW NEAR EAST LIMB, WHERE ANOTHER
REGION MAY BE SOON TO APPEAR NEAR S10. REGION 8525 (N16E59),
ALTHOUGH QUIET, HAS PATCHES OF BRIGHT PLAGE.
IB. Prognos för solaktivitet
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGION 8524 IS THE MOST PROMISING SITE OF M-CLASS
ACTIVITY. REGION 8525 MAY ALSO CONTRIBUTE SHOULD FURTHER DEVELOPMENT
OCCUR.
IIA. Sammanfattning av geofysisk aktivitet 29-2100Z till 30-2100Z
THE GEOMAGNETIC FIELD WAS GENERALLY ACTIVE. A HIGH SPEED SOLAR WIND
STREAM, AT TIMES REACHING MORE THAN 650 KM/S AT THE ACE SPACECRAFT,
DROVE THE FIELD TO EPISODES OF MINOR STORM ACTIVITY DURING THE
PERIOD. THE GREATER THAN 2 MEV ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT
ATTAINED HIGH LEVELS FROM ABOUT 1300 TO 2100Z.
IIB. Prognos för geofysisk aktivitet
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT ACTIVE TO MINOR STORM LEVELS FOR THE NEXT THREE
DAYS. THE HIGH SPEED STREAM SHOULD ABATE BY THE LATTER PART OF THE
PERIOD. A CME, RELATED TO YESTERDAY'S M1 EVENT, MAY IMPACT THE FIELD
AT THE END OF THE FORECAST INTERVAL.
III. Chans för solutbrott från 01 MAY till 03 MAY
| M-klass | 30% | 30% | 30% |
| X-klass | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observerad 30 APR 124 Prognoserat 01 MAY-03 MAY 130/135/140 90 Day Mean 30 APR 128
V. Geomagnetiskt A-index
OBSERVED AFR/AP 29 APR 018/019 ESTIMATED AFR/AP 30 APR 023/025 PREDICTED AFR/AP 01 MAY-03 MAY 015/030-015/030-015/025
VI. Chanser för geomagnetisk aktivitet från 01 MAY till 03 MAY
| A. Medelhöga breddgrader | |||
|---|---|---|---|
| Aktivt | 30% | 30% | 30% |
| Små stormförhållanden | 10% | 10% | 10% |
| Svåra stormförhållanden | 01% | 01% | 01% |
| B. Höga breddgrader | |||
|---|---|---|---|
| Aktivt | 40% | 40% | 40% |
| Små stormförhållanden | 15% | 15% | 15% |
| Svåra stormförhållanden | 01% | 01% | 01% |
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