The relationship between low-frequency oscillations in the chromosphere and background magnetic fields

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Chromosphere, Solar Atmosphere, Solar Magnetic Field, Solar Oscillations, Coronal Loops, H Alpha Line, Low Frequencies, Solar Prominences, Solar Spectra, Solar X-Rays

Scientific paper

Results of two-day observations (July 7 and 8, 1988) of low frequency observations in the chromosphere in the wings of the H-alpha line are summarized. The observed low-frequency oscillations have periods of 96, 66, 46, 38, 32, 28, 25, and 21 min. The wavelengths of the oscillations are 600-700 Mm, comparable with the scale of the background magnetic field in the direction parallel to the equator. The amplitude of the low-frequency observations is substantially enhanced in the region of filaments.

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