North–South asymmetry in cosmic ray fluxes as measured in the stratosphere and in selected solar wind parameters in the near-Earth space |
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Institution: | Lebedev Physical Institute, Russian Academy of Sciences, 53, Leninsky prospect, Moscow 119991, Russian Federation;School of Physics, Venter Street, Potchefstroom Campus, North West University, 2520 Potchefstroom, South Africa |
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Abstract: | North–South asymmetry in the cosmic ray fluxes as resulted from the long-term balloon measurements in the northern and southern polar stratosphere does not agree with that found from the neutron monitor data. In order to reveal possible sources of the observed asymmetry, selected interplanetary parameters were examined. North–South asymmetry relative to the heliospheric neutral sheet was considered for solar wind velocity, plasma density and some other solar plasma parameters. It is shown that North–South asymmetry of the solar wind velocity and plasma density depends on the Earth’s heliolatitude and the phase of the 11-year solar activity cycle. This may be relevant to the results of cosmic ray measurements in the stratosphere. |
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