Low-frequency modulations in the solar microwave radiation as a possible indicator of inductive interaction of coronal magnetic loops

Details Low-frequency modulations in the solar microwave radiation as a possible indicator of inductive interaction of coronal magnetic loops Low-frequency modulations in the solar microwave radiation as a possible indicator of inductive interaction of coronal magnetic loops

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...433..691k&link_type=abstract

Astronomy and Astrophysics, Volume 433, Issue 2, April II 2005, pp.691-699

Astronomy and Astrophysics

Astrophysics

11

Sun: Corona, Sun: Flares, Sun: Magnetic Fields, Sun: Oscillations, Sun: Radio Radiation

Scientific paper

Low-frequency (LF) modulations of 37GHz microwave radiation
during solar flares, recorded at the Metsähovi Radio Observatory,
are considered. A fast Fourier
transformation with a sliding window is used to obtain the dynamic spectra of the
LF pulsations. We pay attention to the LFdynamic spectra having
a specific multi-track structure, which is supposed to be an
indication of a complex multi-loop composition of a flaring region.
Application of the equivalent electric circuit models of the loops
including the effects of electromagnetic inductive interaction in
groups of slowly growing current-carrying magnetic loops allows
us to explain and reproduce the main dynamical features of the observed
LF modulation dynamic spectra. Each loop is considered as an equivalent
electric circuit with variable parameters (resistance, capacitance
and inductive coefficients) which depend on shape, scale, position
of the loop with respect to other loops, as well as on the plasma
parameters and value of the total longitudinal current in the magnetic
tube.

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