Recurrent geomagnetic disturbances and coronal holes as observed in Fe XIV lambda 5303 A

Astronomy and Astrophysics – Astronomy

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Coronal Holes, Geomagnetism, Magnetic Disturbances, Solar Activity Effects, Solar Terrestrial Interactions, Astronomical Observatories, Astronomical Photometry, Data Correlation, Twenty-Seven Day Variation

Scientific paper

We present data obtained with the Fe XIV 5303-A-wavelength coronal photometer of the Sacramento Peak Observatory for the period October 3 to December 22, 1976. During this period there was a pattern of three coronal holes and three emission regions near the solar equator. Recurrent geomagnetic disturbances were associated with two of these three holes. We propose a simple method for predicting recurrent geomagnetic disturbances at times of low solar activity based on coronal brightness and test it on our data. We show that the method gives correct results 72% of the time, compared with 64% for 27-day recurrence.

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