First Observation of the Solar Type III Burst Decay and Its Interpretation

被引：2

作者：

Melnik, V. N. ^{[1
]}

Konovalenko, A. A. ^{[1
]}

Yerin, S. M. ^{[1
]}

Bubnov, I. M. ^{[1
]}

Brazhenko, A. I. ^{[2
]}

Frantsuzenko, A. V. ^{[2
]}

Dorovskyy, V. V. ^{[1
]}

Shevchuk, M. V. ^{[1
]}

Rucker, H. O. ^{[3
]}

机构：

[1] Natl Acad Sci Ukraine, Inst Radio Astron, Kharkov, Ukraine

[2] Gravimetr Observ, Poltava, Ukraine

[3] Austrian Acad Sci, Commiss Astron, Graz, Austria

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 885卷 / 01期

关键词：

plasmas; radiation mechanisms: non-thermal; Sun: corona; Sun: radio radiation; turbulence; waves; BEAM-PLASMA STRUCTURES; ELECTRON-BEAMS; PROPAGATION; CORONA; DYNAMICS; CLOUD;

D O I：

10.3847/1538-4357/ab46aa

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The decay of a Type III burst into two Type III bursts was registered during solar observations by GURT and URAN-2 radio telescopes on 2017 April 18. This was the first time such a phenomenon was observed. Newborn Type III bursts have drift rates smaller than that of a decaying Type III burst. Such decays of Type III bursts were predicted by a gas-dynamic theory of high-energy electron beams propagating through the thermal background plasma. In the frame of this theory Type III sources are beam-plasma structures moving with constant velocities. In our case the sum of velocities of newborn Type III sources equals the velocity of a decaying Type III source. The last one is 0.33c in the case of fundamental radio emission and 0.2c at the harmonic radio emission of a Type III burst. The density ratio of slow and fast newborn Type III sources is about 3.

引用

页数：5

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