Speakers
Prof.
Karel Kudela
(Institute of Experimental Physics, Slovak Academy of Sciences)Dr
PARTHA CHOWDHURY
(Kyung Hee University)Prof.
Y.-J Moon
(Kyung Hee University)
Description
Galactic cosmic rays (GCRs) encounter an outward-moving solar wind with cyclic magnetic-field fluctuation and turbulence. This causes convection and diffusion in the heliosphere. The GCR counts from the ground-based neutron monitor stations show intensity changes that are anti-correlated with the sunspot numbers with a lag of a few months. In this paper, we make a detailed correlative study between GCRs intensity (Lomnicky stit neutron monitor station) and different solar/interplanetary parameters for cycles 21-24. We find a clear asymmetry in the cross-correlation between GCRs and solar/heliospheric activity indicators for both odd and even-numbered solar cycles. The time-lags between GCRs and solar/heliospheric parameters are found different in different solar cycles as well as in the opposite polarity states (A < 0 and A > 0) within the same solar cycle. Further, we have studied the mid-term periodicities of GCRs and found the presence of well –known Rieger ; Rieger type and quasi-biennial oscillations (QBOs) in our power spectrum. Possible explanations of the observed results are discussed in light of modulation models, including drift effects.
| Registration number following "ICRC2015-I/" | 255 |
|---|---|
| Collaboration | -- not specified -- |
Author
Dr
PARTHA CHOWDHURY
(Kyung Hee University)
Co-authors
Prof.
Karel Kudela
(Institute of Experimental Physics, Slovak Academy of Sciences)
Prof.
Y.-J Moon
(Kyung Hee University)
