@InProceedings{BragaDASKMTDHSAS:2011:CoRaMo,
author = "Braga, Carlos Roberto and Dal Lago, Alisson and Alarcon, Walter
Dem{\'e}trio Gonzalez and Schuch, Nelson Jorge and Kuwabara,
Takao and Munakata, Kazuoki and Tokumaru, Munetoshi and Duldig, M.
D. and Humble, J. E. and Sabbah, Ismail and Al Jassar, H. K. and
Sharma, M. M.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and Bartol Research Insitute and Departament of
Physics and Astronomy,University of Delaware - USA and Faculty of
Science, Shinshu University - Japan and Solar-Terrestrial
Environment Laboratory, Nagoya University - Japan and {Australian
Antarctic Division - Australia} and School of Mathematics and
Physics, University of Tasmania - Australia and Astronomy
Department, Faculty of Science, King Abdulaziz University - Saudi
Arabia and Physics Department, Faculty of Science, Kuwait and
Physics Department, Faculty of Science, Kuwait",
title = "Cosmic ray modulation associated to small and moderate geomagnetic
storms during minimum solar activity",
booktitle = "Proceedings...",
year = "2011",
organization = "School on Cosmic Rays and Astrophysics, 4.",
keywords = "Coronal mass ejections, iInterplanetary magnetic field , Cosmic
rays.",
abstract = "Inhomogeneities in the interplanetary magnetic field produced by
interplanetary disturbances associated with coronal mass ejections
are transmitted fast to remote locations as a directional
anisotropy of high-energy cosmic ray intensity due to the high
speed and long parallel mean free path of energetic particles.
Cosmic ray intensity increases or decreases before the Forbush
decreases have been observed with a single directional channel
especially for strong geomagnetic storms associated with strong
interplanetary shocks. The aim of this work is to study cosmic ray
precursory phenomena of small and moderate geomagnetic storms from
June 26th 2008 to December 31st 2008 (from Bartels rotation number
2387 to 2393), most of them not associated with shocks, by
analyzing data from the Global Muon Detector Network consisting of
four multidirectional muon detectors. By analyzing muon count
rates in 60 directional channels, the pitch angle distribution in
a 48-hour period before the storm sudden commencement was studied
by two different methodologies: one using the hourly count rate
(MPA) and the other using the time derivative of the count rate
(VPA). Possible precursors are clear in 4 of the 7 events
registered in the selected period, generally observed by the
MPA.",
conference-location = "Santo Andr{\'e} - S{\~a}o Paulo - Braz",
conference-year = "25 agosto a 4 setembro",
label = "lattes: 0549130828972280 4 BragaDASKMTDHSAS:2011:CoRaMo",
language = "en",
targetfile = "Braga-CRA School_004[1].pdf",
url = "http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=118",
urlaccessdate = "15 jun. 2024"
}