Independent Global Modes of Solar Magnetic Field Fluctuations

Details Independent Global Modes of Solar Magnetic Field Fluctuations Independent Global Modes of Solar Magnetic Field Fluctuations

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005soph..226..359c&link_type=abstract

Solar Physics, Volume 226, Issue 2, pp.359-376

Physics

17

Scientific paper

Observed solar, interplanetary and geomagnetic time series contain quasi periodicities on scales of 1 2.5 years. The further discovery of 1.3 year fluctuations in helioseismic observations suggests that a variety of signals may be related to the underlying dynamo in the Sun. We use independent component analysis to study the temporal and spatial variations of a few statistically independent global modes of the axisymmetric solar magnetic field over a period of 25 years. Five modes capture the salient properties of the data. Two modes describe the polar and high latitude fields, and present 1 1.5 year quasi periodicities. The other three modes correspond to low and mid-latitude phenomena and show both 1.3 and 1.7-year variations. By comparing the characteristic time scales, dates of occurrence and heliocentric latitudes of these modes, we connect them to their manifestations in heliospheric time series.

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