{"id":798567,"date":"2025-10-02T04:02:30","date_gmt":"2025-10-02T09:02:30","guid":{"rendered":"https:\/\/spaceweekly.com\/?p=798567"},"modified":"2025-10-02T04:02:30","modified_gmt":"2025-10-02T09:02:30","slug":"positive-polarity-ch-hss-sparks-g3-strong-geomagnetic-storm","status":"publish","type":"post","link":"https:\/\/spaceweekly.com\/?p=798567","title":{"rendered":"Positive polarity CH HSS sparks G3 – Strong geomagnetic storm"},"content":{"rendered":"


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Solar wind speeds remained elevated at 700\u2013800 km\/s on October 1, with a maximum of 880 km\/s (547 miles\/s) at 17:00 UTC. Overnight into October 2, solar wind speeds remained elevated and reached over 900 and up to 1 045 km\/s on occasions.<\/p>\n

The interplanetary magnetic field (IMF) showed total field strengths of 8\u201310 nT, with the north\u2013south component (Bz) fluctuating between \u00b18 nT.<\/p>\n

Elevated geomagnetic activity began at 08:55 UTC on September 29 and has persisted since, enhanced by Earth\u2019s orientation near the fall equinox. Conditions intensified to G3 \u2013 Strong levels on multiple occasions.<\/p>\n

The latest G3 storming event started at 05:59 UTC on October 2.<\/p>\n

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Credit: NASA\/SDO, The Watchers<\/figcaption><\/figure>\n<\/div>\n

According to NOAA\u2019s space weather scales, G3 \u2013 Strong geomagnetic storms can cause power-system voltage irregularities and false alarms on protection devices. Satellites may experience surface charging, orientation problems, and increased drag in low Earth orbit.<\/p>\n

High-frequency radio may be intermittent, and GPS navigation can show increased range error or temporary signal loss. Aurora visibility during G3 storming extends significantly equatorward, with reports possible as far south as Pennsylvania, Iowa, and Oregon.<\/p>\n

SWPC\u2019s current forecast suggests active to G1\u2013G2 levels may persist beyond the warning window, with continued disturbance expected through October 4 as Earth remains connected to the coronal hole.<\/p>\n

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\u2014 \u6cb9\u4e95 \u4e80\u7f8e\u4e5f\u3000Kimiya.Yui (@Astro_Kimiya) September 30, 2025<\/a><\/p><\/blockquote>\n

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Solar activity has been at moderate levels in 24 hours to 00:30 UTC on October 2, with several M-class flares observed from Region 4232 (beta-gamma-delta).<\/p>\n

A Type II radio emission was detected at 02:09 UTC on October 2, with an estimated shock velocity of ~508 km\/s, typically associated with coronal mass ejections (CME). The CME was confirmed as farsided and is not expected to affect Earth.<\/p>\n

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Sunspots on October 2, 2025. Credit: NASA SDO\/HMI<\/figcaption><\/figure>\n<\/div>\n

A continued alert is in effect for elevated >2 MeV electron flux, which exceeded 1 000 pfu beginning at 13:25 UTC on October 1. Fluxes reached a maximum of 3 601 pfu yesterday, increasing the risk of spacecraft charging. Proton flux remains near background levels, and the probability of an S1 \u2013 Minor solar radiation storm remains low.<\/p>\n


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