Influence of solar heliospheric parameters on cosmic rays anisotropy

Authors: Agarwal Mishra, Rekha; Mishra, Rajesh

Source: Astrophysics, Volume 49, Number 4, October 2006 , pp. 555-566(12)

Publisher: Springer

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Abstract:

In the present work the cosmic ray data of three different neutron monitoring stations, Deep River, Inuvik, and Tokyo, located at different geomagnetic cutoff rigidities and altitudes have been harmonically analyzed for the period 1980-95 for a comparative study of diurnal semi-diurnal and tri-diurnal anisotropies in cosmic ray intensity in connection with the change in interplanetary magnetic field Bz component and solar wind velocity on 60 quietest days. It is observed that the amplitudes of all the three harmonics increase during the period 1982-84 at all the stations during the high speed solar wind stream epoch and remain low during the declining phase of the stream. The amplitudes of the three harmonics have no obvious characteristics associated with the time variation of magnitude of the Bz component. The phases of all the three harmonics have no time variation characteristics associated with solar wind velocity and Bz.

Keywords: cosmic rays; anisotropy; interplanetary magnetic field; solar poloidal magnetic field

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10511-006-0054-7

Publication date: 2006-10-01