What international geomagnetic activity index is sometimes used by individuals tracking personal health logs against space weather calendars?

Answer

Kp-index

Individuals creating localized data collections often compare personal logs, such as headache frequency, against the established international geomagnetic activity index, known as the Kp-index, to correlate activity levels.

What international geomagnetic activity index is sometimes used by individuals tracking personal health logs against space weather calendars?
effectsspace weathergeomagnetic stormsEarth's magnetic fieldhuman behavior