The jump of reverse drift rate of V-shaped structure and the large-scale inhomogeneity of plasma density in the solar atmosphere

Details The jump of reverse drift rate of V-shaped structure and the large-scale inhomogeneity of plasma density in the solar atmosphere The jump of reverse drift rate of V-shaped structure and the large-scale inhomogeneity of plasma density in the solar atmosphere

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...425..281x&link_type=abstract

Astronomy and Astrophysics, v.425, p.281-285 (2004)

Astronomy and Astrophysics

Astrophysics

4

Sun: Flares, Sun: Radio Radiation

Scientific paper

A rare solar radio V-shaped structure was observed on August 25, 1999 by the 4.5-7.5 GHz spectrograph of the Purple Mountain Observatory, China. It consists of a reverse drift component followed by a normal drift one, which seems to be an unusual frequency drift event because of the jump of reverse drift rate from 3.22 to 1.53 GHz/s and the fastest drift rate of -3.53 GHz/s. According to their different drift rates, the V-shaped structure can be divided into three parts. By the consideration of plasma emission of an electron beam, a three-component solar atmospheric model with large and small scale lengths λ, λ1 and λ2 to describe the equilibrium solar atmosphere and local inhomogeneity as well as the energy loss of the electron beam due to electron-electron collision is proposed. The local scale lengths λ1=5.5× 109, λ 2=7.7× 109 cm and /line{v}1=0.41 c, /line{v}2=0.25 c at Parts 1 and 2 of the reverse drift component are obtained. The variations of scale length of λ 1<λ2 and /line{v}1>/line{v}2, especially /line{v}1>/line{v}2, could be responsible for the jump of drift rate. The normal drift rate would be interpreted as the increase of average energy E' of the electron beam at the mirror due to the decrease in electrons of lower energy via energy loss of collision. The three-component solar atmospheric model and the energy loss of the electron beam are discussed.

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