Daytime efficiency and characteristic time scale of interplanetary electric fields penetration to equatorial latitude ionosphere |
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| Authors: | CM Denardini HC Aveiro PDSC Almeida LCA Resende LM Guizelli J Moro JHA Sobral MA Abdu |
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| Institution: | 1. Aeronomy Division, National Institute for Space Research, P.O. Box 515, S. J. Campos, SP, Brazil;2. Earth and Atmospheric Science, Cornell University, Ithaca, NY, USA;3. Department of Electrical Engineering, Universidade de Taubaté, Taubaté, SP, Brazil;1. Department of Physics, West Virginia University, Morgantown, WV 26506, USA;2. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;3. Southwest Research Institute, San Antonio, TX 78228, USA;4. University of Texas at San Antonio, San Antonio, TX 78249, USA;1. INAF-Istituto di Astrofisica e Planetologia Spaziali, Via del Fosso del Cavaliere 100, 00133, Roma, Italy;2. Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Roma, Italy;1. West Department of Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS, Pobedy Av., 41, Kaliningrad 236017, Russia;2. Institute of Solar-Terrestrial Physics, 126a Lermontov St., P.O. Box 291, Irkutsk 664033, Russia;1. Institute of Space Science, National Central University, 300 Jungda Rd., Jhongli, Taoyuan 32001, Taiwan;2. Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 1/2 Leninskie Gory, Moscow 119234, Russia;3. Center for Space and Remote Sensing Research, National Central University, 300 Jungda Rd., Jhongli, Taoyuan 32001, Taiwan;4. Institute of Solar-Terrestrial Physics of Siberian Branch of Russian Academy of Science, 126a Lermontov St., Irkutsk 664033, Russia |
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| Abstract: | We analyze the daytime efficiency of the interplanetary electric field (IEF) penetration to the equatorial ionosphere based on a correlation analysis carried out between different levels of decomposition applied to IEF intensity measured at the ACE spacecraft and ionospheric electric field intensity inferred from ground based magnetometers located in the equatorial region in Brazil. We compare the time variations of those two electric field intensities by means of a scale-by-scale decomposed time series through wavelet multi-resolution analysis. Efficiency is here defined as the fraction of the variation of the IEF intensity that has penetrated into the equatorial region, and it increases with increasing fraction. Two cases of prompt penetration electric fields (PPEF) are analyzed: one occurring on March 31, 2001, and other on April 17, 2002. Our results show that the penetration effect with time scale ranging around 1 h is maximized in relation to other scales. |
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