Pulsations of type IV solar radio emission: The bounce-resonance effects

B. I. Meerson; P. V. Sasorov; A. V. Stepanov

doi:10.1007/BF00152562

Pulsations of type IV solar radio emission: The bounce-resonance effects

B. I. Meerson^*
, P. V. Sasorov
, A. V. Stepanov

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

73 Scopus citations

Abstract

A mechanism of excitation of radial oscillations of a 'magnetic tube' is proposed for the interpretation of a periodic modulation of type IV radio burst intensity in the meter and decimeter range. After the flare a configuration with denser plasma extended along the magnetic field can be formed in the corona. Eigenoscillations of such a system are damped by MHD-wave emission into the external coronal plasma. However, if high energy protons with β ≳ 0.2 are trapped by this configuration, the damping of oscillations can be made up for by an amplification due to bounce-resonant plasma instability. The regularity of the pulse period is explained by presence of a maximum in the wave growth rate dependence on the frequency.

Original language	English
Pages (from-to)	165-179
Number of pages	15
Journal	Solar Physics
Volume	58
Issue number	1
DOIs	https://doi.org/10.1007/BF00152562
State	Published - Jun 1978
Externally published	Yes

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abstract = "A mechanism of excitation of radial oscillations of a 'magnetic tube' is proposed for the interpretation of a periodic modulation of type IV radio burst intensity in the meter and decimeter range. After the flare a configuration with denser plasma extended along the magnetic field can be formed in the corona. Eigenoscillations of such a system are damped by MHD-wave emission into the external coronal plasma. However, if high energy protons with β ≳ 0.2 are trapped by this configuration, the damping of oscillations can be made up for by an amplification due to bounce-resonant plasma instability. The regularity of the pulse period is explained by presence of a maximum in the wave growth rate dependence on the frequency.",

author = "Meerson, \{B. I.\} and Sasorov, \{P. V.\} and Stepanov, \{A. V.\}",

year = "1978",

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AU - Sasorov, P. V.

AU - Stepanov, A. V.

PY - 1978/6

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AB - A mechanism of excitation of radial oscillations of a 'magnetic tube' is proposed for the interpretation of a periodic modulation of type IV radio burst intensity in the meter and decimeter range. After the flare a configuration with denser plasma extended along the magnetic field can be formed in the corona. Eigenoscillations of such a system are damped by MHD-wave emission into the external coronal plasma. However, if high energy protons with β ≳ 0.2 are trapped by this configuration, the damping of oscillations can be made up for by an amplification due to bounce-resonant plasma instability. The regularity of the pulse period is explained by presence of a maximum in the wave growth rate dependence on the frequency.

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Pulsations of type IV solar radio emission: The bounce-resonance effects

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