Speaker
PRAVATA MOHANTY
(Tata Institute of Fundamental Research, Mumbai, India)
Description
A large area (560~m$^2$) tracking muon detector operating in the GRAPES-3
experiment at Ooty in India has been recording cosmic ray muons at a rate of
1.7$\times$ 10$^8$ h$^{-1}$ since 2000. The high statistics data have enabled
sensitive measurement of several solar phenomena to be made including the
solar and sidereal anisotropy and Forbush decreases following coronal mass
ejections. Prior to studies of any of these phenomena, an important task is
to correct the variation in measured muon rates due to atmospheric pressure.
Unfortunately, the pressure coefficient usually deduced from the observed
data is not very reliable due to the presence of various solar phenomena
listed above. Here, we present an alternative method which avoids complications
arising from solar effects. Since the pressure at Ooty displays a 12 h
periodicity, using which we could separate its contribution from other
effects in the muon data though a power spectrum analysis using fast Fourier
transform technique. The method yielded a clear dependence of muon rate on
pressure providing an accurate estimate of the pressure coefficient almost
independent of the solar modulation effects.
| Registration number following "ICRC2015-I/" | 38 |
|---|---|
| Collaboration | -- not specified -- |
Primary authors
PRAVATA MOHANTY
(Tata Institute of Fundamental Research, Mumbai, India)
Prof.
Prasad Subramanian
((Indian Institute of Science Education and Research, Sai Trinity Building, Pashan, Pune 411021, India)
Co-authors
Dr
Akitoshi Oshima
(College of Engineering, Chubu University, Kasugai, Aichi 487-8501, Japan)
Mr
Atul Jain
(Tata Institute of Fundamental Research, Mumbai, India)
Mr
B. Hariharan
(Tata Institute of Fundamental Reseach, Mumbai)
Mr
B.S. Rao
(Tata Institute of Fundamental Research, Mumbai, India)
Prof.
H. Kojima
(Faculty of Engineering, Aichi Institute of Technology, Toyota City, Japan)
Prof.
H.M. Antia
(Tata Institute of Fundamental Reseach, Mumbai)
Prof.
K. Tanaka
(Faculty of Information Sciences, Hiroshima City University, Hiroshima 731-3194, Japan)
Dr
K.P. ARUNBABU
(Tata Institute of Fundamental Research, Mumbai, India)
Mr
P. Jagadeesan
(Tata Institute of Fundamental Research, Mumbai, India)
Dr
P.K. Nayak
(Tata Institute of Fundamental Research, Mumbai, India)
Prof.
Saburo Kawakami
(Gratuate School of Sciences, Osaka City University, Osaka, Japan)
Mr
Samuel Morris
(Tata Institute of Fundamental Research, Mumbai, India)
Shashi Dugad
(Tata Inst. of Fundamental Research (IN))
Prof.
Shoichi Shibata
(College of Engineering, Chubu University, Kasugai, Aichi 487-8501, Japan)
Prof.
Sunil Gupta
(Tata Institute of Fundamental Reseach, Mumbai, India)
Dr
T. Nonaka
(ICRR, Tokyo, Japan)
Prof.
Yoshio Hayashi
(Graduate School of Sciences, Osaka City University, Osaka, Japan)
