On the Periodicity of High Speed Solar Wind Streams |
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Authors: | Verma VK |
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Institution: | (1) Uttar Pradesh State Observatory, NainiTal, 263129, India |
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Abstract: | In the paper we have investigated the periodicity of high speed solar wind (HSSW) streams using the technique of power spectrum
analysis. The data for HSSW streams has been taken from the papers by Lindblad and Lundstedt (1981, 1983) and Lindblad et al. (1989) The power spectrum analysis of the daily HSSW streams events for the period 1964–1975 (solar cycle 20) shows peaks
of 14, 7, 2.9 and 2.6 days, and daily HSSW events for the period 1976–1982 (solar cycle 21) shows peaks of 15.4, 7, 2.9 and
2.6 days. The HSSW events for period 1964–1982 (solar cycles 20-21) shows peaks of 15.4, 7, 3.7, 2.9 and 2.6 days. The common
periods from above study are 7, 2.9 and 2.6 days. The 2.9, 2.6 days and other periods are folding frequency. The 7 days periodicity
is close to the
th of solar rotation which may be the time for energy build up for coronal holes to produce HSSW streams.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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