Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh31a0692b&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH31A-0692
Astronomy and Astrophysics
Astrophysics
1
2100 Interplanetary Physics, 2780 Solar Wind Interactions With Unmagnetized Bodies, 6954 Radio Astronomy, 7500 Solar Physics, Astrophysics, And Astronomy
Scientific paper
The daily values of solar flux and radio bursts at 2800 MHz (10.7 cm wavelength) are known to be closely related to various manifestations of solar activity. The flux values, which vary slowly with time, have long been used as indicators of solar activity. Also, the number of radio bursts shows a variation with the phase of the solar cycle. The close relationships between the 2800 MHz bursts, the associated flares and geophysical phenomena such as shortwave fadeouts have been studied extensively and were established as early as the 1960s. Therefore, a constant monitoring of the Sun at this frequency would enable us to forecast the terrestrial disturbances following the solar activity. Moreover, a detailed study based on past data would help understand solar activity phenomena as well as the origin of these burst events. In the present analysis, we are revisiting some of these points by carrying out an analysis of 40 year data of solar radio bursts with special emphasis on 2800 MHz bursts. A scatter plot of the intensity vs duration shows that the distribution is not completely random but is double--pronged. This result is consistent with earlier works (e.g., Covington, 1959). The two-pronged distribution suggests the existence of two distinct types of burst events: impulsive and gradual rise and fall. The mechanisms that cause the emission of the two types of bursts are also different: the former due to nonthermal processes and the latter due to thermal processes. Our present analysis shows that the intensity--duration plot has a significant variation with the phase of the solar cycle. In addition to this, we present the behaviour of risetime vs duration as well as the frequency distribution of peak flux of these events. The analysis has also been extended to high frequency (> 10 GHz) bursts and the behaviour is contrasted to that of 2800 MHz bursts.
Balachandran Balakumar
Gary Dale E.
Lanzerotti Louis J.
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