Short-Period Features of the Interplanetary Plasma and Their Evolution

Details Short-Period Features of the Interplanetary Plasma and Their Evolution Short-Period Features of the Interplanetary Plasma and Their Evolution

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001soph..201..405p&link_type=abstract

Solar Physics, v. 201, Issue 2, p. 405-417 (2001).

Physics

10

Scientific paper

The solar wind plasma exhibits many features of the solar surface passed on to the interplanetary medium as temporal variations due to the solar rotation. The yearly average values of solar wind velocity, and geomagnetic index A p during 1965 1999 were found to exhibit long period evolution. They were found to peak around the declining phase of each solar cycle. While the solar wind velocity peaks around the second half of the declining phase, the IMF field strength increases around the first half of the declining phase of each solar cycle. The power spectrum of these parameters shows peaks around 37-day, 30-day, 27-day, 13.5-day, 9-day, and 7-day periods. The temporal evolution of the power spectrum of the solar wind plasma parameters and the geomagnetic activity index A p are also studied in detail and presented with the help of contour graphs. These studies indicate that the strength of the quasi-periodicities in the interplanetary medium evolves with time.

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