Response of the topside ionosphere over Arecibo to a moderate geomagnetic storm |
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| Authors: | Diana Prado Garzón Christiano G.M. Brum Ezequiel Echer Néstor Aponte Michael P. Sulzer Sixto A. González Robert B. Kerr Lara Waldrop |
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| Affiliation: | 1. National Astronomy and Ionosphere Center, Arecibo Observatory, HC3 Box 53995, Arecibo 00612, Puerto Rico;2. University of Puerto Rico, Mayaguez Campus, P.O. Box 9000, Mayagüez 00681-9000, Puerto Rico;3. National Institute for Space Research, Av dos Astronautas, 1.758, Jd. Granja—CEP: 12227-010, São José dos Campos, SP, Brazil;4. University of Illinois, 306 Coordinated Science Laboratory, MC-228 1308 W Main Street, Urbana, IL 61801, USA;5. Scientific Solutions Inc., 55 Middlesex Street, Unit 210 North Chelmsford, MA 01863-1561, USA;1. Department of Earth Science, National Cheng Kung University, Tainan, Taiwan;2. Earth Dynamic System Research Center, National Cheng Kung University, Tainan, Taiwan;3. Institute of Space Science, National Central University, Chung-Li, Taiwan;4. National Space Organization, Hsin Chu, Taiwan;1. German Aerospace Center (DLR), German Remote Sensing Data Center (DFD), 82234 Wessling, Germany;2. Augsburg University, 86135 Augsburg, Germany;1. Department of Electrical Engineering, Frederick University, 7 Filokyprou St, Palouriotissa, Nicosia 1036, Cyprus;2. Frederick Research Centre, 7 Filokyprou St, Palouriotissa, Nicosia 1036, Cyprus;1. Divisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, 12227-010 São Paulo, Brazil;2. University of Sheffield, Sheffield, England, United Kingdom;1. Institute of Meteorology and Ocean, PLA Univ. of Sci. & Tech., Nanjing 211101, PR China;2. State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, PR China |
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| Abstract: | We analyze the data obtained using the Arecibo incoherent scatter radar to examine the response of the topside ionosphere to a moderate geomagnetic storm that occurred during the period March 7–11, 2008. During this time period a magnetic storm with a non-monotonic main phase decrease in the Dst index occurred. The recovery phase also exhibited a secondary Dst decrease. During the initial phase of the storm, Te and Ti increased coincident with the arrival of the solar wind. The main phase registered an increase in proton concentration proportional to Ne while temperatures reached the lowest values. Variations in O+ concentration were not significant but a reduction in helium fraction was observed. Soon after the peak of the storm, the transition height between the topside ionosphere and the protonosphere, where H+ ions dominate composition, was lower than would be expected during quiet conditions and this behavior lasted for approximately 12 h. |
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