Viewing archive of Wednesday, 26 May 1999
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 1999 May 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 146 Issued at 2200Z on 26 MAY 1999IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z SOLAR ACTIVITY WAS MODERATE. THERE WERE A LARGE NUMBER
OF WEAK C-CLASS X-RAY FLARES, TWO OF WHICH WERE LONG DURATION
EVENTS. THE FIRST LDE WAS AN OPTICALLY UNCORRELATED C1 AT 25/2137Z,
THE SECOND A C2/SF FROM REGION 8550 (S14W12) AT 26/0522Z. IN
ADDITION THERE WAS A TYPE II RADIO SWEEP (SPEED 650 KM/S) CORRELATED
TO A C2/SF FROM REGION 8554 (N26E26) AT 26/0230Z. FINALLY, THE
STRONGEST FLARE WAS AN M1/2N FLARE FROM REGION 8552 (N11E41) AT
26/1932Z. ONE REGION, 8555 (N16E75), WAS NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
WITH A CHANCE OF AN ISOLATED M-CLASS FLARE.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED WITH A CHANCE FOR ACTIVE
CONDITIONS LATE TOMORROW. THE INFLUENCE OF A RECURRENT CORONAL HOLE
IS EXPECTED DURING THIS TIME.
III. Event Probabilities 27 MAY to 29 MAY
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 26 MAY 153 Predicted 27 MAY-29 MAY 150/155/160 90 Day Mean 26 MAY 129
V. Geomagnetic A Indices
OBSERVED AFR/AP 25 MAY 014/019 ESTIMATED AFR/AP 26 MAY 008/010 PREDICTED AFR/AP 27 MAY-29 MAY 010/010-010/012-010/012
VI. Geomagnetic Activity Probabilities 27 MAY to 29 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
Latest news
Monday, 22 April 2024
Lot's of sunspots! Big chance for major flare activity?
Saturday, 23 March 2024
X1.1 solar flare with earth-directed CME
Wednesday, 20 March 2024
Sunspot region 3615, G1 watch
Latest forum messages
AR 3637, 3638, 3643 72Space Weather Memes 338Unproven theories 340Filaments and prominences 55Growth of Cycle 25 433
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 | 2024/03/28 | X1.1 |
| Last M-flare | 2024/04/24 | M1.7 |
| Last geomagnetic storm | 2024/04/19 | Kp7 (G3) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2024 | 104.9 -19.8 |
| Last 30 days | 129.9 +24.3 |