Periodicities of a few months in solar indices

Details Periodicities of a few months in solar indices Periodicities of a few months in solar indices

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jastp..65..979k&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 65, Issue 8, p. 979-986.

Physics

3

Scientific paper

The periodic structure in the time series of a number of solar indices is examined for the interval 1992-2000. The de-trended values of the 27-day moving averages of various solar indices indicated substantial oscillations (ranges up to 35% or more), but the spacings in successive peaks varied considerably (100-600 days). A spectral analysis indicated prominent peaks at /~360 and 670 days, with minor peaks at 120-230 days. The ranges (peak to trough) were large (15-20%) for solar indices sunspots and magnetic fields, but very small (1-3%) for lines in lower chromosphere, increasing to /~10% in the middle and upper chromosphere, decreasing /(~5%) in the lower transition region, rising rapidly (up to 35%) in the middle corona, and decreasing thereafter to /~20%. The peaks at different solar altitudes generally tallied, indicating that the structures spread above the photosphere into the chromosphere and corona in phase, though the magnitudes were different at different altitudes.

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