Ephemeral periodicities in the solar activity

Details Ephemeral periodicities in the solar activity Ephemeral periodicities in the solar activity

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..537p&link_type=abstract

In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun

Computer Science

2

Solar Activity

Scientific paper

We have carried out a spectral analysis of Hα flares and CMEs during the rising phase of solar cycle 23. The temporal behavior as well as the spatial distribution on the solar disk is examined. We study short-term periodicities of solar activity using wavelet analysis. The time profiles expressed by an analytical relation as a network of periods of enhanced activity computing their amplitudes and phases using the SA methiod. A mixture of stable and ephemeral periodicities (present only for limited time intervals) have been found. Many models and speculations have been published especially after the reported 154 days periodicity. A "clock mechanism" and the superposition of a stochastic behavior on the photospheric magnetic field with various sizes and time scales, have been proposed. The existence of north-south and east-west asymmetries of the flares and CMEs is examined.

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