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 UTC
Prepared 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 2011

IA. 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 M10%01%01%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
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
Active40%30%20%
Minor storm30%10%01%
Major-severe storm05%01%01%
B. High Latitudes
Active50%40%20%
Minor storm25%15%01%
Major-severe storm10%01%01%

All times in UTC

<< Go to daily overview page

Latest news

Support 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!

100%
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2024/11/06X2.39
Last M-flare2024/11/13M1.0
Last geomagnetic storm2024/11/10Kp5+ (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
October 2024166.4 +25
November 2024170.8 +4.3
Last 30 days164.5 +20

This day in history*

Solar flares
12012M8.59
22012M4.14
32005M3.59
42012M3.56
52003M2.36
DstG
11960-339G5
21998-131G2
31989-121G1
41999-106G2
51979-92G1
*since 1994

Social networks