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tatsuki.washimi - 15:04 Friday 01 March 2024 (28731) Print this report
Lightning stroke noise in the O4a

I investigated the lightning-induced glitches during the O4a, toward a conference next week.
In the Blitzortung.org database, 11 lightning strokes were recorded within 300 km of KAGRA.

The magnetometer near the BS detected all events.
In the strain data, only 2 events (180.8 km and 177.0 km) were found as glitch noises significantly larger than the background level.

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tatsuki.washimi - 15:48 Friday 01 March 2024 (28733) Print this report

I analyzed the lightning glitch noise as PEM injection tests and evaluated the magnetic coupling/projection. 

The projected magnetic noise for the normal time was order 1-2 below.

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tatsuki.washimi - 16:22 Friday 01 March 2024 (28736) Print this report

I plotted the lightning position for O4a.

filled face: found in the strain signal
unfilled face: not found in the strain signal
 

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