Viewing archive of Wednesday, 18 August 2010
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 2010 Aug 18 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 230 Issued at 2200Z on 18 Aug 2010IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z
Solar activity was low. Region 1099 (N17W110) produced
two C-class flares during the period. The largest of these was a
long-duration C4 flare at 18/0548Z, with an associated Type-II radio
sweep with an estimated velocity of 545 km/s. SOHO C3 imagery
observed a partial-halo CME at 18/0600Z. This CME is not expected to
be Earth-directed. No new regions were numbered.
IB. Solar Activity Forecast
Solar activity is expected to be very
low, with a slight chance for a C-class flare.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic field was predominantly quiet, with an unsettled
period observed at 18/0600Z. An enhancement of the greater than 10
MeV proton flux at geosynchronous orbit began at around 18/0800Z and
was associated with the long-duration C4 flare at 18/0548Z. The
enhancement peaked around mid-period, then gradually decreased.
Todays Penticton 10.7 cm Flux value was estimated.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be predominantly quiet for the next three days (19-21
August).
III. Event Probabilities 19 Aug to 21 Aug
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Aug 081 Predicted 19 Aug-21 Aug 081/080/080 90 Day Mean 18 Aug 077
V. Geomagnetic A Indices
Observed Afr/Ap 17 Aug 003/005 Estimated Afr/Ap 18 Aug 004/005 Predicted Afr/Ap 19 Aug-21 Aug 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 19 Aug to 21 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
Latest news
Friday, 28 March 2025
X1.1 solar flare
Monday, 24 March 2025
Coronal hole faces Earth
Saturday, 22 March 2025
Strong G3 geomagnetic storm watch for 23 March
Latest forum messages
Unspecified geomagnetic activity 2171Temporary Topic - Ongoing Solar Proton Events 4Similar AR 3664 vs AR 4048 ??? 5AR4048 54NOAA space weather enthusiasts darhboard 4
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 | 2025/03/28 | X1.1 |
| Last M-flare | 2025/03/31 | M1.2 |
| Last geomagnetic storm | 2025/03/27 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| February 2025 | 154.6 +17.6 |
| Last 30 days | 128.5 -22.7 |