caa a22 4500 469104821 CHVBK 20180323133054.0 cr unu---uuuuu 170328e19920601xx s 000 0 eng 10.1007/BF01614129 doi (NATIONALLICENCE)springer-10.1007/BF01614129 The "fan” instability as a possible generating mechanism of vlf quarter-gyrofrequency emissions during the recovery phase of a magnetospheric storm [Elektronische Daten] [J. Bošková, P. Tříska, Yu. Omelchenko, V. Shapiro, V. Sotnikov] Summary: VLF quarter-gyrofrequency emissions, whose experimental characteristics differ from those of discrete plasmaspheric emissions usual during active times, have been observed by low-altitude Intercosmos 24 and Magion 2 satellites within the plasmasphere during periods of quieting geomagnetic activity. A new kind of instability is proposed which could lead to the production of these emissions. It is shown that quasi-electrostatic whistler waves can be generated in the eqquatorial region due to the fan instability, with maximum growth rate and spectral energy density in a frequency band below one half of the equatorial electron gyrofrequency. The observations of low-energy electrons and plasma waves in the equatorial region within or in the vicinity of the plasmapause, which could support our hypothesis experimentally, are discussed. Academia, Publishing House of the Czechoslorak Academy of Sciences, 1992 Bošková J. Geophysical Institute, Czechosl. Acad. Sci., Prague aut Tříska P. Geophysical Institute, Czechosl. Acad. Sci., Prague aut Omelchenko Yu Space Research Institute, Russian Acad. Sci., Moscow aut Shapiro V. Space Research Institute, Russian Acad. Sci., Moscow aut Sotnikov V. Space Research Institute, Russian Acad. Sci., Moscow aut Studia Geophysica et Geodaetica Kluwer Academic Publishers 36/2(1992-06-01), 177-187 0039-3169 36:2<177 1992 36 11200 https://doi.org/10.1007/BF01614129 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01614129 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bošková J. Geophysical Institute, Czechosl. Acad. Sci., Prague aut NATIONALLICENCE 700 1- Tříska P. Geophysical Institute, Czechosl. Acad. Sci., Prague aut NATIONALLICENCE 700 1- Omelchenko Yu Space Research Institute, Russian Acad. Sci., Moscow aut NATIONALLICENCE 700 1- Shapiro V. Space Research Institute, Russian Acad. Sci., Moscow aut NATIONALLICENCE 700 1- Sotnikov V. Space Research Institute, Russian Acad. Sci., Moscow aut NATIONALLICENCE 773 0- Studia Geophysica et Geodaetica Kluwer Academic Publishers 36/2(1992-06-01), 177-187 0039-3169 36:2<177 1992 36 11200 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer