naa a22 4500 510768105 CHVBK 20180411083203.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1007/s12043-013-0561-0 doi (NATIONALLICENCE)springer-10.1007/s12043-013-0561-0 Solar diurnal anisotropy measured using muons in GRAPES-3 experiment in 2006 [Elektronische Daten] [P MOHANTY, D ATRI, S DUGAD, S GUPTA, B HARIHARAN, Y HAYASHI, A JAIN, S KAWAKAMI, S MORRIS, P NAYAK, A OSHIMA, B RAO] The GRAPES-3 experiment at Ooty contains a large-area (560m2) tracking muon detector. This detector consists of 16 modules, each 35m2 in area, that are grouped into four supermodules of 140m2 each. The threshold energy of muons is sec(θ)GeV along a direction with zenith angle θ and the angular resolution of the muon detector is 6°. Typically, it records ~4×109 muons every day. The muon detector has been operating uninterruptedly since 2001, thus providing a high statistics record of the cosmic ray flux as a function of time over one decade. However, prior to using these data, the muon rate has to be corrected for two important atmospheric effects, namely, variations in atmospheric pressure and temperature. Because of the near equatorial location of Ooty (11.4°N), the seasonal variations in the atmospheric temperature are relatively small and shall be ignored here. Due to proximity to the equator, the pressure changes at Ooty display a dominant 12h periodic behaviour in addition to other seasonal changes. Here, we discuss various aspects of a novel method for accurate pressure measurement and subsequent corrections applied to the GRAPES-3 muon data to correct these pressure-induced variations. The pressure-corrected muon data are used to measure the profile of the solar diurnal anisotropy during 2006. The data, when divided into four segments, display significant variation both in the amplitude (~45%) and phase (~42m) of the solar diurnal anisotropy during 2006, which was a period of relatively low solar activity. Indian Academy of Sciences, 2013 Cosmic rays nationallicence muons nationallicence muon detector nationallicence MOHANTY P. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut ATRI D. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut DUGAD S. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut GUPTA S. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut HARIHARAN B. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut HAYASHI Y. Graduate School of Science, Osaka City University, 558-8585, Osaka, Japan aut JAIN A. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut KAWAKAMI S. Graduate School of Science, Osaka City University, 558-8585, Osaka, Japan aut MORRIS S. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut NAYAK P. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut OSHIMA A. Graduate School of Science, Osaka City University, 558-8585, Osaka, Japan aut RAO B. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut Pramana Springer India 81/2(2013-08-01), 343-357 0304-4289 81:2<343 2013 81 12043 https://doi.org/10.1007/s12043-013-0561-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12043-013-0561-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- MOHANTY P. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut NATIONALLICENCE 700 1- ATRI D. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut NATIONALLICENCE 700 1- DUGAD S. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut NATIONALLICENCE 700 1- GUPTA S. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut NATIONALLICENCE 700 1- HARIHARAN B. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut NATIONALLICENCE 700 1- HAYASHI Y. Graduate School of Science, Osaka City University, 558-8585, Osaka, Japan aut NATIONALLICENCE 700 1- JAIN A. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut NATIONALLICENCE 700 1- KAWAKAMI S. Graduate School of Science, Osaka City University, 558-8585, Osaka, Japan aut NATIONALLICENCE 700 1- MORRIS S. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut NATIONALLICENCE 700 1- NAYAK P. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut NATIONALLICENCE 700 1- OSHIMA A. Graduate School of Science, Osaka City University, 558-8585, Osaka, Japan aut NATIONALLICENCE 700 1- RAO B. HECR Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India and GRAPES-3 Experiment, Cosmic Ray Laboratory, 643 001, Ooty, India aut NATIONALLICENCE 773 0- Pramana Springer India 81/2(2013-08-01), 343-357 0304-4289 81:2<343 2013 81 12043 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer