The occurrence of non-uniformity of solar and plasma features throughout five solar cycles

Abstract

Interplanetary magnetic field (IMF) magnitude, plasma and solar parameters recorded at 1 AU over a period of 50 years have been studied according to IMF polarity sense. Our results indicated that there is a symmetric in toward and away days which may depend slightly upon the magnetic state of the heliosphere. Statistically insignificant dependence between the magnetic field B and solar activity was deduced. The solar plasma speed (SWS) are faster by about 13 km/s for toward than for away polarity days during the solar cycle 21 and by 16 km/s for toward than for away polarity days during the solar activity cycle 22. In contrast, the SWS are faster by about 17.5 km/s for away than for toward polarity days during the solar activity cycle 23. In addition, the solar plasma was hotter during toward than away days during solar cycles 21, 22, and 24, while it was cooler during toward than away days during solar activity cycles 20 and 23 .Finally, the observed asymmetry phenomena can be used as an indicator for solar activity.