Abstract Details
| Name: Bhupendra Kumar Tiwari Affiliation: A.P.S. University Rewa M.P. Conference ID: ASI2017_422 Title : Dependence of Heliospheric and Cosmic Rays Modulation on Solar Activity Authors and Co-Authors : B.K.Tiwari A.P.S.university Rewa M.P. Abstract Type : Oral Abstract Category : Sun and the Solar System Abstract : We sturdy the changes of Cosmic Rays (CRs) intensity for the ending period of the solar cycle 23 and the beginning of the solar cycle 24 using neutron monitors experimental data, we show that an increase of the CRs intensity in 2009 is generally related with decrease of solar wind velocity V (<450 Km/sec), strength of B of the interplanetary magnetic field, and the drift in negative (A<0) polarity epoch. Solar variability controls the structure of the heliosphere and produce changes in CRs intensity. Based on the observation from Omniweb data centre for solar- interplanetary data and yearly mean count rate of cosmic ray intensity (CRI) variation data from Oulu / Moscow neutron monitors (Rc = 0.80 GV & Rc = 2.42 GV) during 1996-2016 . It is observed that the sun is remarkably quiet and the strength of the interplanetary magnetic field has been falling off to new low levels , reduces the CR entering inner- heliosphere and it is high anti-correlation ( r = -0.78) between sunspot number & CR flux. We find, during this unusual minimum, the correlation of CR intensity is poor with sunspot number(r = -0.40), better with IMF (r = -0.78) and SWV (r = -0.80) and much better with the tilt angle of the heliospheric current sheet (r = -0.90). It is also found that 10.7 cm solar radio flux, velocity of solar wind and the strength and turbulence of the interplanetary magnetic field were positive correlated with each other and inverse correlated with count rate of cosmic ray intensity. Keywords- Interplanetary Magnetic Field (IMF), Cosmic Rays (CRs), Solar Wind Velocity (SWV). |