A phase/frequency modulation model for the annual and solar rotation periodicities in IMF

Details A phase/frequency modulation model for the annual and solar rotation periodicities in IMF A phase/frequency modulation model for the annual and solar rotation periodicities in IMF

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506...63t&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

Solar Rotation, Periods, Interplanetary Magnetic Field

Scientific paper

We study the annual periodicity and the solar rotation periodicity of the Bx component of the interplanetary magnetic field (IMF). It is known since long that the annual periodicity undergoes a phase reversal in 11 years, reflecting the 22-year Hale cycle of the solar magnetic field. We construct a simple model where the annual periodicity of the IMF components is phase/frequency modulated by the Hale cycle, and show that this model can outstandingly well reproduce the observed properties of the annual periodicity. We show that the solar rotation periodicity depicts an analogous nodal structrure and a phase reversal with a period of about 3.2 years. This implies a new periodicity in the phase properties of the interplanetary magnetic field. We demonstrate that, using the observed spectral width, the phase/frequency modulation model can satisfactorily explain this structure. We also note that taking into account the observed phase reversal in the solar rotation periodicity implies that the most persistent synodic solar rotation period in Bx is 27.6 days, i.e., somewhat longer than recently suggested.

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