New mechanism for the formation of discrete stripes in the solar radio spectrum

被引:21
作者
Laptukhov, A. I. [1 ]
Chernov, G. P. [1 ]
机构
[1] Russian Acad Sci, Pushkov Inst Terr Magnetism Ionosphere & Radio Wa, Troitsk 142092, Russia
基金
俄罗斯基础研究基金会;
关键词
D O I
10.1134/S1063780X06100060
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Dispersion relations are derived for the eigenfrequency spectrum of a spatially periodic nonlinear plasma resonators created in the solar atmosphere due to the development of thermal instability. The eigenfrequency spectra of such resonators are calculated, and it is shown that they are capable of generating tens of discrete stripes (a so-called zebra structure) the number of which is independent of the ratio of the plasma frequency to the gyrofrequency in the source. This may help to overcome all difficulties in explaining the large number of stripes in the zebra structure, as well as the small magnitude of the magnetic field. The spatially periodic plasma resonators under consideration act as a filter with numerous transparency windows separated from one another by opaque regions. The number of stripes and their frequencies in the zebra structure depend on the spatial period of plasma nonuniformity, which is equal to meters or decameters for conditions typical of the solar atmosphere. The high brightness temperature of radio emission in the zebra structure is attributed to coherent emission from a large number of identical small-scale plasma sources. Some regular properties of the observed zebra structure are explained.
引用
收藏
页码:866 / 871
页数:6
相关论文
共 14 条
  • [1] [Anonymous], 1959, GEWOHNLICHE DIFFEREN
  • [2] Blatt F. J., 1968, PHYS ELECT CONDUCTIO
  • [3] Chernov G. P., 1976, Soviet Astronomy, V20, P582
  • [4] Manifestation of quasilinear diffusion on whistlers in the fine-structure radio sources of solar radio bursts
    Chernov, GP
    [J]. PLASMA PHYSICS REPORTS, 2005, 31 (04) : 314 - 324
  • [5] CHERNOV GP, 1976, ASTRON REP, V48, P853
  • [6] CHERNOV GP, 1990, SOL PHYS, V130, P234
  • [7] Ginzburg V. L., 1975, WAVES MAGNETOACTIVE, VSecond
  • [8] KOVALEV VA, 1990, KINEMATIKA FIZ NEBES, V6, P38
  • [9] A model of zebra emission in solar type IV radio bursts
    LaBelle, J
    Treumann, RA
    Yoon, PH
    Karlicky, M
    [J]. ASTROPHYSICAL JOURNAL, 2003, 593 (02) : 1195 - 1207
  • [10] LAPTUKHOV AI, 1991, INTERPLANETARY MEDIU