Effect of solar heliospheric parameters on different components of daily variation in cosmic rays |
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Authors: | Rekha Agarwal Mishra Rajesh K Mishra |
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Institution: | (1) Department of Physics, Govt. Model Science College (Autonomous), Jabalpur, Madya Pradesh, 482 001, India;(2) Computer and I.T. Section, Tropical Forest Research Institute, Mandla Road, P.O. RFRC, Jabalpur, 482 021, Madya Pradesh, India;(3) Present address: C-4, Anumit Enclave, Phase-I, Pachpedi, Near Maihar House, South Civil Line, Jabalpur, Madya Pradesh, 482 001, India |
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Abstract: | In the present work the data of three different neutron monitoring stations, Deep River, Tokyo and Inuvik located at different
geomagnetic cutoff rigidities and altitudes has been harmonically analysed for the period 1980–1993, 1980–1990 and 1981–1993
respectively to investigate for a comparative study of diurnal, semi-diurnal and tri-diurnal anisotropies in cosmic ray (CR)
intensity in connection with the change in IMF Bz component and solar wind velocity on 60 quietest days. It is observed that
the amplitude of first harmonic is highly anti-correlated to the solar wind velocity during the period of high-speed solar
wind stream (HSSWS) epoch on quiet days for three neutron monitor stations at different geomagnetic rigidity thresholds. During
quiet days the amplitude of all the three harmonics significantly deviates on the onset of HSSWS epoch, whereas the direction
of the anisotropy of all the three harmonics remains time invariant at three different cut off rigidity stations. The amplitude
as well as the direction of anisotropy of all the three harmonics does not have time variation characteristics associated
with Bz component of IMF on geo-magnetically most quiet days. |
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Keywords: | Cosmic rays Diurnal Semi-diurnal Anisotropy Quiet days Interplanetary magnetic field and solar poloidal magnetic field |
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