Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...122.110k&link_type=abstract
"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,
Physics
Scientific paper
Small-scale fluctuations of the quiet Sun chromosphere brightness is investigated by radio telescope RATAN-600 in a frequency range 6.2 - 13.3 GHz. The 22 frequency channels with a high flux sensitivity and a high accuracy of polarization degree measurements were used. The observations were done during the very low solar activity level in March, 12 - 23, 2008, every 24 minutes from 7 to 11 UT.
The 1-D observational data of RATAN-600 are compared with the 2-D simultaneous data in other frequency diapasons: Fe IX/X, Fe XII, Fe and He II (SOHO), Ca (Meudon, France), H-alpha (Pic du Midi, France). It is shown that the more strong sources of low contrast structures observed with RATAN-600 are associated with the brightest nodes of chromosphere supergranular structure. The spectral and temporal characteristics of the low contrast structures were investigated with different analysis technique including Fourier and wavelet analysis. Small-scale structures of the quiet Sun with characteristic sizes of 20-40 arcsec manifest a high correlation between measurements at all observed frequencies and allowed to estimate average lifetimes with duration of several hours. There is a direct relation between sizes and lifetimes for separate elements (those with large sizes live longer). The spectral and temporal characteristics of an incipient active region and of numerous X-ray bright points are presented. The estimations of magnetic fields are done accordingly to polarization measurements. The daily monitoring with RATAN-600 observations provides possibilities to regularly estimate the state of quiet Sun by emission characteristics of microwave small-scaled structure and to track rises of new centers of activities.
Bogod Vladimir M.
Kaltman T. I.
Korzhavin A. N.
Tokhchukova Kh. S.
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