Viewing archive of onsdag, 20 april 2005
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 2005 Apr 20 2210 UTC# Prepared jointly by the U.S. Dept. of Commerce, NOAA, #Space Environment Center and the U.S. Air Force. #
USAF/NOAA rapport för sol- och geofysisk aktivitet
SDF Nummer 110 publicerat klockan 2200Z på 20 Apr 2005IA. Analys av solfläcksgrupper och solaktivitet från 19-2100Z till 20-2100Z Solar activity was very low. Region 755 (S12E37)
produced a B 8 flare at 19/2217 UTC with an associated Type II radio
sweep (estimated speed of 1128 km/s) and a CME with an estimated
speed of 776 km/s. The CME was directed to the east and is not
expected to be geoeffective. No new regions were numbered today.
IB. Prognos för solaktivitet
Solar activity is expected to be very
low with a slight chance for an isolated C-flare.
IIA. Sammanfattning av geofysisk aktivitet 19-2100Z till 20-2100Z
The geomagnetic field was at quiet to minor storm levels. Heightened
activity was due to a solar sector boundary followed by the onset of
a coronal hole high speed stream. Solar wind speed at ACE increased
from approximately 350 km/s to 600 km/s. By the end of the period,
solar wind speed had decreased to approximately 450 km/s.
IIB. Prognos för geofysisk aktivitet
The geomagnetic field is
expected to be quiet to unsettled with isolated active conditions
possible on 21 April. On 22 April, conditions are expected to
increase to unsettled to active with minor storm periods possible as
another coronal hole high speed stream is expected to become
geoeffective. On 23 April, unsettled to active conditions are
expected.
III. Chans för solutbrott från 21 Apr till 23 Apr
| M-klass | 01% | 01% | 01% |
| X-klass | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observerad 20 Apr 077 Prognoserat 21 Apr-23 Apr 080/080/080 90 Day Mean 20 Apr 091
V. Geomagnetiskt A-index
Observerad Afr/Ap 19 Apr 006/008 Förväntat Afr/Ap 20 Apr 015/020 Prognoserat Afr/Ap 21 Apr-23 Apr 010/015-015/018-012/015
VI. Chanser för geomagnetisk aktivitet från 21 Apr till 23 Apr
| A. Medelhöga breddgrader | |||
|---|---|---|---|
| Aktivt | 25% | 30% | 25% |
| Små stormförhållanden | 10% | 15% | 10% |
| Svåra stormförhållanden | 01% | 05% | 05% |
| B. Höga breddgrader | |||
|---|---|---|---|
| Aktivt | 30% | 30% | 30% |
| Små stormförhållanden | 15% | 15% | 15% |
| Svåra stormförhållanden | 05% | 05% | 05% |
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