Geomagnetic storms in San Antonio on September 18, 2026

September 18, 2026

San Antonio change region

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Maximum Kp index on September 18, 2026

Kp = 3-

The Earth's magnetosphere was quiet

Kp = 3-

Changes in the geomagnetic index Kp from September 16 to 18, 2026 for mid latitudes

Time zone — UTC−05 — summer time (San Antonio | geographic coordinates — 29.46 N 98.52 W)

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PNG API: JSON | TXT

Changes in the maximum daily geomagnetic index Kp in September 2026 for mid latitudes

Time zone — UTC−05 — summer time (San Antonio | geographic coordinates — 29.46 N 98.52 W)

August 2026 October 2026

PNG API: JSON | TXT

Geomagnetic index A_p	5
Solar radio flux F10.7	96