Viewing archive of Saturday, 14 April 2001
Solar activity report
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.
Report of Solar-Geophysical Activity 2001 Apr 14 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 104 Issued at 2200Z on 14 Apr 2001IA. Analysis of Solar Active Regions and Activity from 13-2100Z to 14-2100Z Solar activity was moderate. Region 9415 (S22W72)
produced an M1/SF event during 14/1715-1828 UTC. Peak x-ray flux
occurred at 14/1811 UTC, after an extended and variable rise in flux
levels. Also observed were an associated Type-II sweep, 150 sfu
tenflare, eruptive prominence and bright surging on the limb.
Imagery from SOHO/LASCO indicated a subsequent CME, however not
appearing earth-directed. Region 9418 (N26W59) also produced a
subfaint flare during the event, and now exhibits some increase in
areal coverage and magnetic complexity. Two new regions were
numbered today: 9428 (N14W39) and 9429 (N09E62).
IB. Solar Activity Forecast
Solar activity is expected to be low
to moderate. Regions 9415 and 9418 remain potential sources of
isolated major flares.
IIA. Geophysical Activity Summary 13-2100Z to 14-2100Z
The geomagnetic field was at unsettled to active levels, primarily
due to lingering effects of the geomagnetic storm that commenced on
13 April. Greater-than-2 MeV electron flux at geosynchronous orbit
reached high levels at 1415 UTC, and remained above threshold
through the end of the period.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to increase, with major storm levels possible during the
next 24 hours, due to an expected shock arrival from CME activity
observed on 12 April. Storm activity is expected to wane during the
following two days, with quiet to unsettled levels expected by the
end of the period.
III. Event Probabilities 15 Apr to 17 Apr
| Class M | 70% | 60% | 50% |
| Class X | 20% | 10% | 10% |
| Proton | 20% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 14 Apr 139 Predicted 15 Apr-17 Apr 140/145/150 90 Day Mean 14 Apr 166
V. Geomagnetic A Indices
Observed Afr/Ap 13 Apr 031/036 Estimated Afr/Ap 14 Apr 020/020 Predicted Afr/Ap 15 Apr-17 Apr 030/040-020/030-010/020
VI. Geomagnetic Activity Probabilities 15 Apr to 17 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 25% | 20% |
| Minor storm | 15% | 10% | 05% |
| Major-severe storm | 10% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 30% |
| Minor storm | 25% | 20% | 10% |
| Major-severe storm | 20% | 10% | 05% |
All times in UTC
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