Story perspectives
Mother's Day Superstorm Disrupts HF Radio Across Northern Hemisphere
10/2/2025
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Story summary
- May 10-12, 2024: a G5 geomagnetic storm caused 98% depletion of ionospheric electron density over China and the Northern Hemisphere, disrupting HF radio.
- Kp reached 9; Dst was -412 nT, highlighting HF radio vulnerabilities.
- Dubbed the Mother's Day Superstorm, the Southern Hemisphere saw increased densities.
- Recovery began May 13; researchers are updating models to account for hemispheric differences.
