Viewing archive of Wednesday, 21 September 2005

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 2005 Sep 21 2204 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 264 Issued at 2200Z on 21 Sep 2005

IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z

Solar activity was very low. Region 810 (N08E21) is the only region with spots on the visible disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low to low.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic field was quiet to unsettled. The greater then 2 MeV electron flux at geosynchronous orbit was high again today.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be quiet to unsettled.
III. Event Probabilities 22 Sep to 24 Sep
Class M10%10%10%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       21 Sep 086
  Predicted   22 Sep-24 Sep  085/080/080
  90 Day Mean        21 Sep 093
V. Geomagnetic A Indices
  Observed Afr/Ap 20 Sep  003/006
  Estimated     Afr/Ap 21 Sep  003/012
  Predicted    Afr/Ap 22 Sep-24 Sep  005/010-005/010-005/010
VI. Geomagnetic Activity Probabilities 22 Sep to 24 Sep
A. Middle Latitudes
Active10%10%10%
Minor storm05%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active20%20%20%
Minor storm10%10%10%
Major-severe storm05%05%05%

All times in UTC

<< Go to daily overview page

Current data suggests there is a moderate possibility for aurora to appear at the following high latitude regions in the near future

Reykjavik

Current data suggests there is a slight possibility for aurora to appear at the following high latitude regions in the near future

Tórshavn
Oulu
Trondheim
Luleå, Sundsvall, Umeå
The direction of the interplanetary magnetic field is slightly South (-5.27nT).
The maximum X-ray flux of the past two hours is:
C9.32
A southern hemisphere coronal hole was detected in an earth-facing position on Tuesday, 8 April 2025

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!

Donate SpaceWeatherLive Pro
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Tuesday, 8 April 2025
23:57 UTC - Hemispheric Power Index

The OVATION model predicts the Hemispheric Power Index to reach 50GW at 00:44 UTC


22:42 UTC - Solar flare

Moderate M1.57 flare

alert


22:24 UTC - Radio Blackout

Minor R1 radio blackout in progress (≥M1 - current: M1.52)


15:15 UTC - Geomagnetic activity

Minor G1 geomagnetic storm (Kp5) Threshold Reached: 14:59 UTC

alert


06:30 UTC - Type II Radio Emission

Begin Time: 08/04/2025 05:53 UTC Estimated Velocity: 456km/sec.


Get instant alerts!

Space weather facts

Last X-flare2025/03/28X1.1
Last M-flare2025/04/08M1.5
Last geomagnetic storm2025/04/06Kp5 (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
March 2025134.2 -20.4
April 2025151.3 +17.1
Last 30 days137.4 +0.1

This day in history*

Solar flares
12000M2.97
22023M2.9
32000M2.66
42015M2.06
51999M1.66
DstG
11995-102G1
21984-99G2
32000-87
41959-71G1
51960-64
*since 1994

Social networks