SFI = 133
A index = 7
K index = 1
SSN = 129
GEOMAGNETIC STORM WATCH: For the next 3 days, minor G1-class geomagnetic storms are likely, according to NOAA forecasters. The action could begin later today, July 21st, when a slow-moving CME is expected to hit Earth’s magnetic field; it was hurled into space by a solar eruption on July 15th. Forecasters believe a high-speed stream of solar wind is following close behind the CME. Its arrival on July 22nd could amplify any storm the CME creates, prolonging the unrest through July 23rd.
SOLAR TSUNAMI AND CME: Sunspot AR3060 exploded during the early hours of July 21st (0100 UT), producing a C5-class solar flare and a solar tsunami. The “tsunami” is the shadowy shock wave seen racing away from the blast site in this extreme ultraviolet movie from NASA’s Solar Dynamics Observatory:
Soon after the explosion, the US Air Force reported a Type II solar radio burst–a natural form of radio noise produced by shock waves in the leading edge of a CME. This means we can expect a CME to emerge from the blast site.
NOAA STI
:Product: Geophysical Alert Message wwv.txt
:Issued: 2022 Jul 21 0905 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
#
# Geophysical Alert Message
#
Solar-terrestrial indices for 20 July follow.
Solar flux 133 and estimated planetary A-index 7.
The estimated planetary K-index at 0900 UTC on 21 July was 2.
No space weather storms were observed for the past 24 hours.
Space weather for the next 24 hours is predicted to be minor.
Geomagnetic storms reaching the G1 level are likely.
NOAA Alerts
Space Weather Message Code: WARK04
Serial Number: 4141
Issue Time: 2022 Jul 21 1107 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2022 Jul 21 1107 UTC
Valid To: 2022 Jul 21 1800 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents – Weak power grid fluctuations can occur.
Aurora – Aurora may be visible at high latitudes such as Canada and Alaska.