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CONCERNING SPIKES IN EMISSION AND ABSORPTION IN MICROWAVE RANGE
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Gennady Chernov Submitted: 2012-07-03 05:16
In some events weak fast solar bursts (near the quiet Sun level) were observed at the background of numerous spikes in emission and absorption. In such a case the background contains the noise signals of the receiver. In the events 16 September 2005 and 14 April 2002 the solar origin of fast busts was confirmed by simultaneous registration of the bursts in several remote observatories. The background noisy pixels in emission and absorption can be excluded by more high subtracted level of continuum during construction of spectra. The wavelet spectrum, noisy profiles in different polarization channels and the spectrum with greater subtracting zero level of the continuum prove a noisy character of shortest pixels in emission and absorption. Thus, in each case, in order to judge the solar origin of all spikes, it is necessary to determine the level of continuum against the background of which the solar bursts are observed. Several models of microwave spikes are discussed. The ECM emission mechanism runs into serious problems with the interpretation the microwave millisecond spikes: the main obstacles are too high values of the magnetic field strength in the source (w_Pe < w_Be). The probable mechanism is the interaction of plasma Langmuir waves with ion-sound waves (l+s -->t) in a source related with shock fronts in the reconnection region.
Authors: G.P.Chernov, R.A.Sych, G.L.Huang, H.S. Ji, Y.H.Yan, and C.M.Tan
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Publication Status: Accepted in Research in Astron. Astrophys. http://arxiv.org/submit/505638/process
Last Modified: 2012-07-04 04:29
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