Long-Term and Medium-Term Variations of Solar Radio Emissions at Different frequencies

Details Long-Term and Medium-Term Variations of Solar Radio Emissions at Different frequencies Long-Term and Medium-Term Variations of Solar Radio Emissions at Different frequencies

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004soph..219..357k&link_type=abstract

Solar Physics, v. 219, Issue 2, p. 357-365 (2004).

Physics

2

Scientific paper

Plots of 12-month moving averages of the radio emission values for 1947 2002 indicated that the ratios (maximum/minimum) of the solar cycles 19 23 were low (˜ 1.2) in the upper chromosphere and lower corona (frequencies near 15 000 MHz), rose to maximum levels of ˜ 3.5 in the middle corona (frequencies ˜ 2000±500 MHz), and dropped thereafter to ˜ 2.5. In some cycles, there were two maxima separated by about 2 years. In cycles 20 and 23, mostly the second maximum was larger than the first maximum, but in cycles 21 and 22, some parameters showed the first maximum larger while others showed the second maximum larger. There was no systematic shift from first maximum to second maximum, with frequency or temperature (or altitude).

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