The H-alpha development of an intense limb flare and associated flaring arches

Physics

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Coronal Loops, H Alpha Line, Solar Flares, Solar Limb, Solar Prominences, Chromosphere, Radio Emission, Solar Activity Effects

Scientific paper

The H-alpha analysis of the development of the strong impulsive and faint gradual phase of the June 26, 1983 flare indicates the following: the flare originated from two microprominences on the southeast border of NOAA 4227; and the main flare structure was a flare cone, which consisted of a bright surge-like stream, elevated above two flare ribbons (located in the cone's base). The flare cone had a height of about 40,000 km and lasted 4 min in H-alpha. The upper part of the cone was terminated by a very fine loop, which was bent to the west, where later a chromospheric brightening occurred at the footpoint of a flaring arch. A 300 keV burst and radio spikes were observed during the maximum flare phase. The flaring arch system, with its apex at a height of about 48,000 km, formed the skeleton for the coronal helmet structure. The velocity of the plasma moving along the flaring arch was between 3500 km/s and 6900 km/s during the first brightening (14:07 UT).

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