Solar flare-related eruptions followed by long-lasting occultation of the emission in the He II 304 A line and in microwaves

Abstract

Plasma with a temperature close to the chromospheric one is ejected in solar eruptions. Such plasma can occult some part of emission of compact sources in active regions as well as quiet solar areas. Absorption phenomena can be observed in the microwave range as the so-called 'negative bursts' and also in the He II 304 A line. The paper considers three eruptive events associated with rather powerful flares. Parameters of absorbing material of an eruption are estimated from multi-frequency records of a 'negative burst' in one event. 'Destruction' of an eruptive filament and its dispersion like a cloud over a huge area observed as a giant depression of the 304 A line emission has been revealed in a few events. One such event out of three ones known to us is considered in this paper. Another event is a possibility.

23 pages, 8 figures, submitted for publication in Astronomy Reports

References in corpus (3)

• X-Ray Jet Dynamics in a Polar Coronal Hole Region
• Absorption Phenomena and a Probable Blast Wave in the 13 July 2004 Eruptive Event
• Causal Relationships between Eruptive Prominences and Coronal Mass Ejections

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• A Challenging Solar Eruptive Event of 18 November 2003 and the Causes of the 20 November Geomagnetic Superstorm. III. Catastrophe of the Eruptive Filament at a Magnetic Null Point and Formation of an Opposite-Handedness CME
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• Microwave Negative Bursts as Indications of Reconnection between Eruptive Filaments and Large-Scale Coronal Magnetic Environment
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