Viewing archive of Friday, 8 July 2011
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 2011 Jul 08 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 189 Issued at 2200Z on 08 Jul 2011IA. Analysis of Solar Active Regions and Activity from 07-2100Z to 08-2100Z Solar activity has been at low levels for the past 24
hours. New Region 1247 (S18E11) emerged early in period and has
produced four C-class events, the largest being a C3/1N at 1331Z.
Region 1247 continued to grow throughout the period and remains the
most active region on the visible disk. Two other regions were
numbered today, Region 1246 (N14W47) and Region 1248 (N20E53), but
both have remained quiet and stable.
IB. Solar Activity Forecast
Solar activity is expected to be at
low levels with a slight chance for M-class events for the next
three days (09-11 July), as Region 1247 continues to grow and
evolve.
IIA. Geophysical Activity Summary 07-2100Z to 08-2100Z
The geomagnetic field has been mostly quiet for the past 24 hours.
Solar wind speeds, as measured by the ACE spacecraft, have remained
at background levels, ranging from 330 km/s - 380 km/s. The greater
than 2 MeV electron flux at geosynchronous orbit reached high levels
during the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be unsettled with a chance for active conditions on day
one (09 July), as a recurrent coronal hole high-speed stream (CH
HSS) moves into a geoeffective position. Quiet to unsettled levels
are expected on day two (10 July), as the effects of the CH HSS
continue. A return to quiet levels is expected on day three (11
July).
III. Event Probabilities 09 Jul to 11 Jul
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 08 Jul 086 Predicted 09 Jul-11 Jul 088/088/088 90 Day Mean 08 Jul 099
V. Geomagnetic A Indices
Observed Afr/Ap 07 Jul 006/006 Estimated Afr/Ap 08 Jul 007/007 Predicted Afr/Ap 09 Jul-11 Jul 010/010-007/007-005/005
VI. Geomagnetic Activity Probabilities 09 Jul to 11 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 05% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 10% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
Latest news
Tuesday, 15 April 2025
CME arrival, G3 storm watch
Friday, 28 March 2025
X1.1 solar flare
Monday, 24 March 2025
Coronal hole faces Earth
Latest forum messages
AR 14079 70Unspecified geomagnetic activity 2384Short PBS episode on Aurora sounds 6Power transmission for all of us. And why I believe we are better prepared than ever for major solar events 33New satellites - Proba-3, PUNCH, SWFO-L1, GOES-U/19 54
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 | 2025/04/30 | M2.03 |
| Last geomagnetic storm | 2025/05/02 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2025 | 140.6 +6.4 |
| May 2025 | 48.5 -92.1 |
| Last 30 days | 116.9 -13.6 |