Quasi-periodic pulsations in solar flares
Nakariakov, V. M. (Valery M.) and Melnikov, V. F. (2009) Quasi-periodic pulsations in solar flares. Space Science Reviews, Vol.149 (No.1-4). pp. 119-151. ISSN 0038-6308Full text not available from this repository.
Official URL: http://dx.doi.org/10.1007/s11214-009-9536-3
Quasi-periodic pulsations (QPP) are a common feature of flaring energy releases in the solar atmosphere, observed in all bands, from radio to hard X-ray. In this review we concentrate on QPP with the periods longer than one second. Physical mechanisms responsible for the generation of long QPP split into two groups: "load/unload" mechanisms and MHD oscillations. Load/unload mechanisms are repetitive regimes of flaring energy releases by magnetic reconnection or by other means. MHD oscillations can affect all elements of the flaring emission generation: triggering of reconnection and modulation of its rate, acceleration and dynamics of non-thermal electrons, and physical conditions in the emitting plasmas. In the case of MHD oscillations, the periodicity of QPP is determined either by the presence of some resonances, e.g. standing modes of plasma structures, or by wave dispersion. Periods and other parameters of QPP are linked with properties of flaring plasmas and their morphology. Observational investigation of the QPP generation mechanisms based upon the use of spatial information, broadband spectral coverage and multi-periodicity is discussed.
|Item Type:||Journal Item|
|Subjects:||Q Science > QB Astronomy|
|Divisions:||Faculty of Science > Physics|
|Journal or Publication Title:||Space Science Reviews|
|Official Date:||December 2009|
|Number of Pages:||33|
|Page Range:||pp. 119-151|
|Access rights to Published version:||Restricted or Subscription Access|
|Funder:||Royal Society (Great Britain), Royal Society British-Russian Research Collaboration|
|Grant number:||07-02-01066, 08-02-92228, 09-02-00624|
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