Viewing archive of Tuesday, 11 April 2000
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 2000 Apr 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 102 Issued at 2200Z on 11 APR 2000IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z
SOLAR ACTIVITY WAS MODERATE. REGION 8948 (S15W12) PRODUCED
TODAY'S ONLY M-CLASS EVENT, AN M1/1N AT 1810Z. THE REGION PRODUCED
ADDITIONAL SUBFLARES AND CONTINUES TO BE THE DOMINATE REGION ON THE
DISK. THERE HAS BEEN A SLOW DECLINE AND SIMPLIFICATION IN THE REGION
AND THE DELTA CONFIGURATION OF THE LAST FEW DAYS APPEARS TO BE GONE.
NEW REGION 8958 (N17E66) ROTATED IN TO VIEW TODAY AS A SIMPLE B-TYPE
REGION.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. THERE IS A FAIR-TO-GOOD CHANCE FOR CONTINUED M-CLASS
FLARES FROM REGION 8948. HOWEVER, THE RECENT DECLINING TREND IN THE
REGION WILL LIKELY LEAD TO A GRADUAL REDUCTION IN INTENSITY AND
FREQUENCY OF FLARES FROM THIS REGION.
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
THE GEOMAGNETIC FIELD WAS MOSTLY QUIET TO UNSETTLED FOR THE PAST 24
HOURS. THE GREATER THAN 2 MEV ELECTRON FLUXES ATTAINED HIGH LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BECOME ACTIVE SOMETIME OVER THE NEXT 24-48 HOURS. A MORE
DETAILED ANALYSIS OF YESTERDAY'S CORONAGRAPH DATA SHOWED THAT IN
FACT A VERY FAINT HALO CORONAL MASS EJECTION COULD BE ASSOCIATED
WITH THE M3 FLARE OF 9 APRIL FROM 8948. WHILE FAR FROM A CERTAINTY,
THERE IS A FAIR CHANCE FOR THE CME TO PASS BY EARTH AND ENHANCE
ACTIVITY LEVELS SOMETIME DURING THE NEXT 1-2 DAYS. CONDITIONS ARE
EXPECTED TO RETURN TO QUIET TO UNSETTLED BY THE THIRD DAY.
III. Event Probabilities 12 APR to 14 APR
| Class M | 50% | 45% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 11 APR 182 Predicted 12 APR-14 APR 185/190/190 90 Day Mean 11 APR 186
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 APR 014/020 ESTIMATED AFR/AP 11 APR 010/012 PREDICTED AFR/AP 12 APR-14 APR 020/020-020/015-010/007
VI. Geomagnetic Activity Probabilities 12 APR to 14 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 25% |
| Minor storm | 20% | 20% | 10% |
| Major-severe storm | 15% | 15% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 25% | 25% | 15% |
| Major-severe storm | 20% | 20% | 05% |
All times in UTC
Latest news
Wednesday, 14 May 2025
Another X-flare! Potent sunspot region 4087!
Tuesday, 13 May 2025
X1.1 solar flare from sunspot region 4086
Tuesday, 15 April 2025
CME arrival, G3 storm watch
Latest forum messages
AR 14098 14Strong far side CME 407Filaments and prominences 178Unspecified geomagnetic activity 2511Solar Transit, Artifacts, or Radiation 21
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 | 2025/05/14 | X2.7 |
| Last M-flare | 2025/05/21 | M1.2 |
| Last geomagnetic storm | 2025/05/17 | Kp6+ (G2) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2025 | 140.6 +6.4 |
| May 2025 | 73.1 -67.5 |
| Last 30 days | 84.8 -31 |