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Radio Emission of Flares and Coronal Mass Ejections

Solar Physics, 2008
International audienceWe review recent progress on our understanding of radio emission from solar flares and coronal mass ejections (CMEs) with emphasis on those aspects of the subject that help us address questions about energy release and its ...
Alexander Nindos, G Trottet, K -L Klein
exaly   +2 more sources

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Unusually low coronal radio emission at the solar minimum

Solar Physics, 1992
We present two-dimensional observations of the quiet Sun at 73.8, 50.0, and 38.5 MHz obtained with the Clark Lake Radioheliograph during the sunspot minimum period of September 1986. The observed peak brightness temperatures during the entire period of sunspot minimum are found to be extremely low, lying in the range (0.6 × 105 K − 2.5 × 105 K).
G. Thejappa, M. R. Kundu
openaire   +1 more source

Oscillations of coronal loops and second pulsations of solar radio emission

Astronomy Letters, 2007
The dispersion properties of the sausage eigenmodes of oscillations in a thin magnetic flux tube are numerically analyzed in terms of ideal magnetohydrodynamics (MHD). The period of the modes accompanied by the emission of MHD waves into the surrounding medium, which leads to acoustic damping of oscillations, is determined by the radius of the tube ...
Yu. G. Kopylova, A. V. Melnikov, A. V. Stepanov, Yu. T. Tsap, T. B. Goldvarg   +4 more
openaire   +1 more source

Statistical Links between Solar Cosmic Rays, Type-II Radio Emission, and Coronal Mass Ejections

Geomagnetism and Aeronomy, 2021
Type-II radio emission often accompanies events in solar cosmic rays and is an indicator of the propagation of a shock wave in the solar corona. Conversely, the shock wave associated with coronal mass ejections plays an important role in the acceleration of solar protons.
G. A. Bazilevskaya, Yu. I. Logachev, E. I. Daibog, N. A. Vlasova, E. A. Ginzburg, V. N. Ishkov, L. L. Lazutin, M. D. Nguyen, G. M. Surova, O. S. Yakovchuk   +9 more
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Density Depletion in a Coronal Flux Tube Associated With Solar Radio Emission

Solar Physics, 2006
A discussion, which is motivated by recent study of solar radio emission, is presented to address the issue under what conditions the depletion of plasma density in a flux tube in the corona may take place. Two particular situations are of interest: One is that density is depleted due to the presence of beams of energetic particles, and the other is ...
C. S. Wu, C. B. Wang, Q. M. Lu
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Estimating the Lateral Speed of a Fast Shock Driven by a Coronal Mass Ejection at the Location of Solar Radio Emissions

Astronomy and Astrophysics
Context. Fast coronal mass ejections (CMEs) can drive shock waves capable of accelerating electrons to high energies. These shock-accelerated electrons act as sources of electromagnetic radiation, often in the form of solar radio bursts. Recent findings suggest that radio imaging of solar radio bursts can provide a means to estimate the lateral ...
Emilia Kilpua, Diana E Morosan, Jens Pomoell   +2 more
exaly   +4 more sources

Specific Features of Radio Emissions of Coronal Holes Based on Eclipse and Noneclipse Observations at a Solar Activity Minimum

Geomagnetism and Aeronomy, 2012
Solar coronal holes (CHs) at a minimum of the 23rd activity cycle were investigated using Solar and Heliospheric Observatory (SOHO) data, ground-based observational data from the radio telescopes of the Kislovodsk Solar Station, Pulkovo Observatory (KSS PO), Russian Academy of Sciences, and radioheliograph data from the Nobeyama Observatory (Japan ...
Svetlana Guseva, A D Shramko
exaly   +2 more sources

A study of solar radio emission in the light of Sengupta's model of coronal active regions

Solar Physics, 1973
Daily solar radio flux at six different frequencies in dm, cm and mm wavelength regions has been studied for 182 days from December 1, 1970 to May 30, 1971. It is found that the slowly varying component of the centimeter wave emission correlates well with the physical model of the coronal active regions derived by Sengupta (Sengupta, 1971b) from which,
P. R. Sengupta, A. K. Chakraborty
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Physical characteristics of the radio emission of solar coronal holes

Geomagnetism and Aeronomy, 2016
This paper presents a brief overview of works dedicated to the studies of solar coronal holes (CH). Special attention is paid to CH studies at millimeter and centimeter wavelengths. The observational data in the millimeter range, combined with satellite observations in the ultraviolet and soft X-ray range, as well as solar eclipse observations of March
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Periodicities in the Time Series of Solar Coronal Radio Emissions and Chromospheric uv Emission Lines

Solar Physics, 2002
A spectral analysis of the time series of daily values of ten solar coronal radio emissions in the range 275–1755 MHz, the 2800 MHz radio flux, several UV emission lines in the chromosphere and in the transition region, and sunspot number, for six successive intervals of 132 days each, during June 1997–July 1999 (26 months) showed that the spectral ...
openaire   +1 more source