Are 'negative bursts' due to absorption

Details Are 'negative bursts' due to absorption Are 'negative bursts' due to absorption

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...51..203s&link_type=abstract

Solar Physics, vol. 51, Jan.-Feb. 1977, p. 203-215.

Physics

5

Astronomical Models, H Alpha Line, Microwave Attenuation, Solar Corona, Solar Flares, Solar Radio Bursts, Centimeter Waves, Microwave Emission, Optical Thickness, Solar Activity, Solar Limb

Scientific paper

Although optical activity near the time of two microwave negative bursts is distinctive enough to demonstrate a real relationship, it does not occur simultaneously with the radio events. This form of association between microwave flux decreases and H-alpha prominence or filament activity is typical of a sample of 23 negative bursts. A model of a microwave-occulting cloud differs from that of an H-alpha absorber because the H-alpha dark flocculus is relatively low, dense, and compact, while the microwave occulter is higher in the corona, larger, and more completely ionized. While the two types of absorption are not expected simultaneously, they might be separate phases of an ejection of chromospheric material into the corona. Evidence for microwave decreases resulting from absorption is discussed. The tendency of decrease-associated activity to be toward the east limb is considered.

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