Viewing archive of Sunday, 28 March 2004
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 2004 Mar 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 088 Issued at 2200Z on 28 Mar 2004IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z
Solar activity was low. Today's activity consisted of a
few, low-level C-class flares. Most of these were from Region 582
(N15E30) which is the largest region on the disk and appears to be
growing slowly. New Region 587 (S13E73) rotated into view today as a
bright, moderately sized (110 millionths) bipolar region.
IB. Solar Activity Forecast
Solar activity is expected to be low,
but there is a chance for an isolated M-class event sometime during
the next three days (28-30 March) with Region 582 the most likely
source for energetic activity.
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic field was mostly unsettled to active, with a minor
storm period from 0300-0600 UTC. Solar wind data show the continued
presence of a high speed stream. There was an overall decreasing
trend in solar wind velocity: initial speeds around 900 km/s
declined to around 650 km/s by forecast issue time. Fluctuations in
the interplanetary magnetic field were weak (-6 to + 6 nT), and
disappeared altogether between 1300-2000 UTC. The greater than 2 MeV
electron fluxes reached high levels during the past 24 hours.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be unsettled to active for the next two days (28-29
March). A decrease to predominantly unsettled is expected by the
third day (30 March).
III. Event Probabilities 29 Mar to 31 Mar
| Class M | 35% | 35% | 35% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Mar 129 Predicted 29 Mar-31 Mar 125/120/120 90 Day Mean 28 Mar 111
V. Geomagnetic A Indices
Observed Afr/Ap 27 Mar 012/014 Estimated Afr/Ap 28 Mar 018/020 Predicted Afr/Ap 29 Mar-31 Mar 015/020-015/015-010/010
VI. Geomagnetic Activity Probabilities 29 Mar to 31 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 25% | 25% | 20% |
| Major-severe storm | 10% | 10% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 25% | 25% | 20% |
| Major-severe storm | 20% | 20% | 10% |
All times in UTC
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