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Simultaneous observation of upstream waves with ISEE and AMPTE
Affiliation:1. Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90024, U.S.A.;2. Blackett Laboratory, Imperial College, London, U.K.;1. West Department of Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, RAS, 236035 Kaliningrad, Russia;2. Immanuel Kant Baltic Federal University, 236016 Kaliningrad, Russia;1. Washera Geospace and Radar Science Research Laboratory, Science College, Bahir Dar University, Ethiopia;2. Institute of Geophysics Space Science and Astronomy (IGSSA), Addis Ababa, University, Ethiopia;1. Institute of Ionosphere, 16 Kyrpychova Str., Kharkiv 61002, Ukraine;2. Institute of Atmospheric Physics of the Czech Academy of Science, Boční II 1401/1A, Prague 14100, Czech Republic;3. State Institution National Antarctic Scientific Center of the Ministry of Education and Science of Ukraine, 16 Taras Shevchenko Blvd., Kyiv 01601, Ukraine;4. Institute of Radio Astronomy of the National Academy of Sciences of Ukraine, 4 Mystetstv Str., Kharkiv 61002, Ukraine;5. University of New Brunswick, 3 Bailey Dr, Fredericton, NB E3B 5A3, Canada
Abstract:Measurements obtained by ISEE-2 and the UKS spacecraft upstream of the Earth's bow shock are examined. simultaneous observations show that upstream waves are excited over a broad frequency range. Even when peaked spectra occur the peaks can occur at different frequencies in different regions of space. Generally the spectra seen at the two locations are most similar at high frequencies and least similar at low frequencies. The position dependent nature of the upstream waves indicates that comparisons between ground-based measurements and in situ observations must be undertaken with some caution.
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