Propagation and Space Weather….

SFI = 116

A index = 24

K index = 5

SSN = 87

SURPRISE GEOMAGNETIC STORM: solar wind stream hit Earth on August 7th. At first, the stream’s velocity was low, but during the day it sped up to more than 600 km/s, ultimately causing a moderately strong G2-class geomagnetic storm. This event was not in the forecast. Although the storm is subsiding now, it could flare up again on August 8th as the solar wind continues to blow.

All of these sunspots have stable magnetic fields that pose little immediate threat for strong flares. Credit: SDO/HMI


:Product: Geophysical Alert Message wwv.txt
:Issued: 2022 Aug 08 0605 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Geophysical Alert Message
Solar-terrestrial indices for 07 August follow.
Solar flux 116 and estimated planetary A-index 24.
The estimated planetary K-index at 0600 UTC on 08 August was 5.

Space weather for the past 24 hours has been moderate.
Geomagnetic storms reaching the G2 level occurred.

Space weather for the next 24 hours is predicted to be minor.
Geomagnetic storms reaching the G1 level are expected.

NOAA Alerts

Space Weather Message Code: ALTK05
Serial Number: 1379
Issue Time: 2022 Aug 08 0607 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2022 Aug 08 0559 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 – Minor

NOAA Space Weather Scale descriptions can be found at

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents – Weak power grid fluctuations can occur.
Spacecraft – Minor impact on satellite operations possible.
Aurora – Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.