Current conditions

:Product: Geophysical Alert Message wwv.txt
:Issued: 2026 Sep 13 1805 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
#
#          Geophysical Alert Message
#
Solar-terrestrial indices for 12 September follow.
Solar flux 109 and estimated planetary A-index 7.
The estimated planetary K-index at 1800 UTC on 13 September was 1.00.

No space weather storms were observed for the past 24 hours.

No space weather storms are predicted for the next 24 hours.

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Last 25 or 250 wwv alert messages.

Solar activity and geomagnetic forecast

Geomagnetic 3 days forecast for high latitudes

planetary index (K)

UTC	00-03	03-06	06-09	09-12	12-15	15-18	18-21	21-00
2026 Sep 13	2	2	3	4	4	3	2	2
2026 Sep 14	3	3	4	5	4	4	3	2
2026 Sep 15	3	3	4	5	4	2	2	2

Probability of Geomagnetic conditions at high latitudes

	Active	Minor_Storm	Major-Severe_Storm
2026 Sep 13	15	20	20
2026 Sep 14	15	20	20
2026 Sep 15	15	20	20

Geomagnetic 3 days forecast for mid latitudes

planetary index (K)

UTC	00-03	03-06	06-09	09-12	12-15	15-18	18-21	21-00
2026 Sep 13	2	2	2	2	2	2	2	3
2026 Sep 14	3	3	3	3	3	2	3	3
2026 Sep 15	3	3	3	3	3	2	2	3

Probability of Geomagnetic conditions at mid latitudes

	Active	Minor_Storm	Major-Severe_Storm
2026 Sep 13	20	5	1
2026 Sep 14	30	5	1
2026 Sep 15	25	5	1

24-hour forecast of a polar cap absorption (PCA) event

Green
No active sunspot region on the Sun is likely to produce a PCA event in the 24 hours.

Computed daily at 23h00Utc from datas issued from SEC.
f5len.org (c 2004-2010)

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