Mid-, and long-term periodicities of interplanetary plasma parameters throughout the period (1967-2017): Case Study, the distribution of hemispheric solar activities by using the wavelet analysis

Document Type : Original Article

Authors

1 physics and chemistry, faculty of education, Alexandria university

2 Physics Department, Faculty of Science, Alexandria University. Alexandria, Egypt

3 Physics and Chemistry Dept., Faculty of Education, Alexandria University, Alexandria, Egypt.

4 Physics Dept., Faculty of Science, Alexandria University, Alexandria, Egypt.

Abstract

In this article, mid-, and long-term periodicities of interplanetary plasma parameters (B, V, n, T, and P) aaccording to the distribution of the hemispheric SSAs in solar hemispheres utilizing the wavelet analysis throughout the period 1967-2017 have been examined. The association between the SSAs and each interplanetary plasma parameter can be established if and only if both the SSAs and the daily averages of each interplanetary plasma parameter have been smoothed by a window of a 3-year running average and a particular time-lag has been applied. The solar activity cycle (~ 10.7 yr), that has almost same power, is the most prominent periodicity in BN and BS power spectra. In addition, the wavelet power spectra of SWSN and SWSS displayed a broad variety of periodicities and their temporal evolutions. The GWS of SWSS provided two significant peaks at 9.8 and 15.2-yr, as well as at 13.9- yr, for SWSN. Furthermore, the most prominent peaks are the periodicities at 9.8 and 13.9 years (9.8 and 15.2 years) for TN (TS) spectra. Additionally, the periodicity around 1.5-yr reveals an increase in power throughout the time intervals (1968-1976) and (1982-1987) for TN and (1970-1972), (1975-1983), and (1985-1993) for TS.

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