Viewing archive of Sunday, 29 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 29 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 119 Issued at 2200Z on 29 Apr 2001IA. Analysis of Solar Active Regions and Activity from 28-2100Z to 29-2100Z Solar activity remained low. Region 9433 (N18W63)
produced isolated C-class subflares as it continued to show gradual
decay in its lead and intermediate spots. However, no significant
changes occurred within its trailer spots, where a magnetic delta
configuration persisted. Region 9441 (N07E11) continued a gradual
growth phase, but remained simply structured. Region 9444 (S11E52)
showed minor spot and penumbral development. Region 9445 (N24E61)
also exhibited minor spot and penumbral development and produced
isolated C-class subflares late in the period. New Region 9446
(S05W22) was numbered.
IB. Solar Activity Forecast
Solar activity is expected to be at
moderate to high levels. Region 9433 is expected to produce isolated
low-level M-class flares during the period. It may also produce an
isolated major flare before crossing the west limb on 02 May.
IIA. Geophysical Activity Summary 28-2100Z to 29-2100Z
Geomagnetic field activity ranged from quiet to active levels. The
geomagnetic field disturbance that began yesterday subsided to quiet
to unsettled levels after 29/0600 UTC.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be at quiet to unsettled levels during the period.
Region 9433 could produce a proton flare before crossing the west
limb on 02 May.
III. Event Probabilities 30 Apr to 02 May
| Class M | 70% | 70% | 70% |
| Class X | 20% | 20% | 20% |
| Proton | 20% | 20% | 20% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 29 Apr 192 Predicted 30 Apr-02 May 190/185/180 90 Day Mean 29 Apr 168
V. Geomagnetic A Indices
Observed Afr/Ap 28 Apr 034/028 Estimated Afr/Ap 29 Apr 015/015 Predicted Afr/Ap 30 Apr-02 May 010/010-010/010-010/012
VI. Geomagnetic Activity Probabilities 30 Apr to 02 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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