Viewing archive of Saturday, 25 April 1998
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 1998 Apr 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 115 Issued at 2200Z on 25 APR 1998IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z SOLAR ACTIVITY WAS LOW. REGION 8210 (S16E67) PRODUCED
TWO C-CLASS FLARES, A C3/SF LONG DURATION EVENT AT 25/1439Z AND A
C1/1F AT 25/1806Z WITH AN ASSOCIATED HIGH SPEED SURGE. BOTH FLARES
WERE ACCOMPANIED BY MINOR DISCRETE RADIO ACTIVITY. THIS REGION HAS
GROWN TO A DAO SPOT GROUP, BUT APPEARS TO BE MAGNETICALLY SIMPLE
THUS FAR. A THIRD C-CLASS EVENT, AN UNCORRELATED C1 X-RAY BURST, WAS
DETECTED AT 25/1123Z. NEW REGION 8211 (S22W12), A SIMPLE AXX SPOT,
WAS NUMBERED TODAY. THIS REGION RESIDES IN AN EXTENSIVE PLAGE FIELD
THAT APPEARS RIPE FOR DEVELOPMENT.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGION 8210 HAS A GOOD CHANCE OF PRODUCING FURTHER
C-CLASS ACTIVITY, A FAIR CHANCE OF M-CLASS ACTIVITY, AND A CHANCE OF
ISOLATED X-CLASS ACTIVITY OVER THE ENTIRE FORECAST PERIOD.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO ACTIVE FOR MOST OF THE PERIOD WITH
A SHORT PERIOD OF MINOR STORMING AT THE BEGINNING OF THE UT DAY. THE
GREATER THAN 2 MEV ENERGETIC ELECTRON FLUX REACHED HIGH LEVELS AT
25/1650Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE ENTIRE FORECAST PERIOD.
III. Event Probabilities 26 APR to 28 APR
| Class M | 15% | 20% | 20% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 25 APR 092 Predicted 26 APR-28 APR 094/096/096 90 Day Mean 25 APR 104
V. Geomagnetic A Indices
OBSERVED AFR/AP 24 APR 023/035 ESTIMATED AFR/AP 25 APR 018/015 PREDICTED AFR/AP 26 APR-28 APR 015/012-010/010-005/008
VI. Geomagnetic Activity Probabilities 26 APR to 28 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 15% | 10% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
Latest news
Thursday, 21 November 2024
Major far side eruption, S1 radiation storm
Monday, 11 November 2024
Coronal hole faces Earth
Friday, 1 November 2024
X2.0 solar flare
Latest forum messages
Filaments and prominences 529Strong far side CME 225AR 13901 110AR 13903 1Incoming & Unnumbered Active Regions 1246
More topicsSupport SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!
Space weather facts
| Last X-flare | 2024/11/06 | X2.39 |
| Last M-flare | 2024/11/20 | M1.1 |
| Last geomagnetic storm | 2024/11/10 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| October 2024 | 166.4 +25 |
| November 2024 | 142.7 -23.8 |
| Last 30 days | 156.1 +4.7 |