Long-term and transient time variation of cosmic ray fluxes detected in Argentina by CARPET cosmic ray detector |
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| Authors: | RRS De Mendonça J-P Raulin FCP Bertoni E Echer VS Makhmutov G Fernandez |
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| Institution: | 1. Centro de Rádio Astronomia e Astrofísica Mackenzie, Escola de Engenharia CRAAM/EE, Universidade Presbiteriana Mackenzie, São Paulo, Brazil;2. National Institute for Space Research, INPE, C.P. 515, CEP 12227-010, São José dos Campos, SP, Brazil;3. Lebedev Physical Institute LPI, Moscow, Russia;4. El Leoncito Astronomical Complex CASLEO, San Juan, Argentina;1. Kazan (Volga Region) Federal University, Kazan, Russia;2. Kazan State Power Engineering University, Kazan, Russia;3. Kazan National Research Technical University named after A.N. Tupolev, Kazan, Russia;1. University of Leeds, United Kingdom;2. Virginia Tech, United States;3. Leibniz-Institute of Atmospheric Physics, Kühlungsborn, Germany;4. German Aerospace Centre-Institute of Atmospheric Physics, Oberpfaffenhofen, Germany;1. Space Research Institute of RAS, Profsoyuznaya Str., 84/32, Moscow 117997, Russia;2. Scobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 1-2 Leninskiye Gory, GSP-1, Moscow, 119991, Russia;3. Higher School of Economics National Research University, 21/4 Staraya Basmannaya Ulitsa, Bld. 1, Moscow, Russia;4. Lomonosov Moscow State University, Faculty of Physics, 1-2 Leninskiye Gory, GSP-1, Moscow, 119991, Russia;5. Space Research and Technologies Institute of BAS, Sofia, Bulgaria |
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| Abstract: | We present results obtained at El Leoncito (CASLEO, San Juan, Argentina) with the CARPET charged particles detector installed in April 2006. The observed modulation of the cosmic ray flux is discussed as a function of its time variability and it is related to longer solar activity variations and to shorter variations during solar and geomagnetic transient activity. Short period (few minutes, few hours) cosmic ray modulation events are observed during rain time (precipitation) and significant variations of the atmospheric electric field. Complementary observations of the atmospheric electric field indicate that its time variations play an important role in the detected cosmic ray event. |
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