L. H. Deng
Articles written in Journal of Astrophysics and Astronomy
Volume 32 Issue 3 September 2011 pp 401-409
The monthly sunspot numbers compiled by Temmer
Volume 33 Issue 2 June 2012 pp 221-226
In this paper, the north–south (N–S) asymmetry of the polar faculae at relatively low (RLLs), relatively high (RHLs) as well as total latitudes (TLs) respectively, are investigated. It is found that
the polar faculae behave in a different asymmetrical way at different latitudinal bands;
the asymmetry of solar activity may be a function of latitudes, which is present not only in the low-latitude solar activity but also in the high-latitude solar activity;
the N–S asymmetry of the polar faculae at TLs depends on that at RHLs, and the asymmetry of the polar faculae at RLLs only plays a modulatory role.
Volume 33 Issue 4 December 2012 pp 387-397
To understand better the variation of solar activity indicators originated at different layers of the solar atmosphere with respect to sunspot cycles, we carried out a study of phase relationship between sunspot number, flare index and solar radio flux at 2800 MHz from January 1966 to May 2008 by using cross-correlation analysis. The main results are as follows:
The flare index and sunspot number have synchronous phase for cycles 21 and 22 in the northern hemisphere and for cycle 20 in the southern hemisphere.
The flare index has a noticeable time lead with respect to sunspot number for cycles 20 and 23 in the northern hemisphere and for cycles 22 and 23 in the southern hemisphere.
For the entire Sun, the flare index has a noticeable time lead for cycles 20 and 23, a time lag for cycle 21, and no time lag or time lead for cycle 22 with respect to sunspot number.
The solar radio flux has a time lag for cycles 22 and 23 and no time lag or time lead for cycles 20 and 21 with respect to sunspot number.
For the four cycles, the sunspot number and flare index in the northern hemisphere are all leading to the ones in the southern hemisphere.
These results may be instructive to the physical processes of flare energy storage and dissipation.
Volume 40 | Issue 3
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