Viewing archive of Sunday, 1 May 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 May 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 121 Issued at 2200Z on 01 May 2011IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 01-2100Z Solar activity was low. Region 1195 (S16W99) produced
the sole event of the period, a C1 flare at 01/0814Z.
IB. Solar Activity Forecast
Solar activity is forecast to be very
low to low for the next 3 days (2-4 May).
IIA. Geophysical Activity Summary 30-2100Z to 01-2100Z
The geomagnetic field was unsettled to active at mid latitudes. Minor
to major storm conditions occurred at high latitudes due to Coronal
Hole (CH) high-speed stream (HSS) effects. Solar winds speeds were
sustained above 620 km/s during the period. 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 mostly unsettled to active with a chance for a minor
storm on day 1 (2 May). Conditions are forecast to be unsettled to
active on day 2 (3 May) and return to quiet on day 3 (4 May) as CH
HSS effects are expected to subside.
III. Event Probabilities 02 May to 04 May
| Class M | 10% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 01 May 106 Predicted 02 May-04 May 105/100/100 90 Day Mean 01 May 108
V. Geomagnetic A Indices
Observed Afr/Ap 30 Apr 017/024 Estimated Afr/Ap 01 May 016/022 Predicted Afr/Ap 02 May-04 May 012/015-008/010-005/005
VI. Geomagnetic Activity Probabilities 02 May to 04 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 30% | 20% |
| Minor storm | 30% | 10% | 01% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 50% | 40% | 20% |
| Minor storm | 25% | 15% | 01% |
| Major-severe storm | 10% | 01% | 01% |
Latest news
Monday, 13 May 2024
M6.6 solar flare with earth-directed CME
Sunday, 12 May 2024
Small CME impact, Record visitor amount
Saturday, 11 May 2024
Strongest geomagnetic storm since 2003, X5.8 solar flare
Latest forum messages
Unproven theories 428Total Beginner 3May 2024 Geomagnetic Storms from AR 13664 (2) 289AR3664 860Space Weather Memes 355
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 | 2024/05/14 | X1.6 |
| Last M-flare | 2024/05/14 | M2.5 |
| Last geomagnetic storm | 2024/05/13 | Kp6 (G2) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2024 | 136.5 +31.6 |
| May 2024 | 149.2 +12.7 |
| Last 30 days | 177.1 +82.7 |