Viewing archive of Friday, 13 August 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 Aug 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 225 Issued at 2200Z on 13 AUG 1999IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z SOLAR ACTIVITY WAS LOW. REGION 8662 (S16W33) PRODUCED
SEVERAL C-CLASS FLARES, THE LARGEST OF WHICH WAS A C4/SF AT
13/1559UT. DECAY, PARTICULARLY IN THE TRAILER SUNSPOTS, IS
CONTINUING. NEW REGION 8668 (N21E75) IS ROTATING AROUND THE EAST
LIMB.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. C-CLASS FLARES ARE EXPECTED IN REGION 8662. A LOW-LEVEL
M-CLASS FLARE IS ALSO POSSIBLE IN THIS REGION.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO ACTIVE. A SINGLE ACTIVE
PERIOD OCCURRED FROM 13/0300-0600UT.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 14 AUG to 16 AUG
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 13 AUG 127 Predicted 14 AUG-16 AUG 128/130/132 90 Day Mean 13 AUG 163
V. Geomagnetic A Indices
OBSERVED AFR/AP 12 AUG 008/010 ESTIMATED AFR/AP 13 AUG 010/010 PREDICTED AFR/AP 14 AUG-16 AUG 010/010-010/008-010/008
VI. Geomagnetic Activity Probabilities 14 AUG to 16 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
Latest news
Monday, 11 November 2024
Coronal hole faces Earth
Friday, 1 November 2024
X2.0 solar flare
Wednesday, 9 October 2024
X1.8 solar flare, severe geomagnetic storm watch
Latest forum messages
sun goes blank 41AR13883 2024/11/04 CME 41Incoming & Unnumbered Active Regions 1204AR 3878 176Space Weather Memes 561
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 | 2024/11/11 | M1.3 |
| 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 | 175.7 +9.3 |
| Last 30 days | 164.2 +19.1 |