Abstract: we have analysed the relation between cosmic ray decrease , solar activity and geomagnetic indices for the duration of solar cycle 24 in magnetic field of Sun. we used CR-Fds and SSN as most reliable parameter. In this studies we taken data of CR-Fds and SSN as a solar parameter for short-term of Solar cycle-24. We calculate the correlation FDs vs SSN and Fds-Dst and FDs-Ap for positive era of solar magnetic field. However, significant difference are found positive era then relation are found during the magnetic field of solar cycle-24.

Keyword: Forbush Decrese (FDs), Sunspot Numbers, Geomagnetic indices (Dst).

| DOI: 10.17148/IARJSET.2023.10657