Formation of polarization jet during injection of ions into the inner magnetosphere
Статья в сборнике трудов конференций
Библиогр. в конце ст. (15 назв.)
поляризационная струя; инжекция ионов; магнитосфера; polarization jet; injection of ions; magnetosphere
Physics of auroral phenomena
Apatity, Kola science centre
Physics of auroral phenomena : proceedings of the 25th annual seminar, 26 February – 1 March 2002 / Russian academy of sciences, Kola science centre, Polar Geophysical Institute ; the editorial board: A. G. Yahnin, N. V. Semenova, V. V. Shabalin. – Apatity : Kola science centre, Russian Academy of Sciences, 2002. – 168 p.
Long-lasting ground based measurements of a polarization jet (PJ) by the latitudinal chain of ionospheric stations in Yakutia (3 < L < 5; MLT = UT + 9 h) and by 5 subauroral Russian stations were analyzed. A number of cases were found when PJ was recorded simultaneously with energetic ion observations by AMPTE/CCE and INTERBALL 2. The data comparison shows that at least in the considered cases of strong magnetic substorms, PJ was accompanied by strong injection of ions with the energy of ~20-50 keV and intensity of ~10 cm-² c-¹ sr-¹keV-¹. Close to the injection region in the near midnight sector no ion dispersion was observed, but in the evening sector nose events were detected. In accordance with the mechanism suggested by Southwood and Wolf (JGR, 1978, 83, 5227) PJ was observed near the equatorial boundary of energetic ion penetration into the magnetosphere. Measurements by ionosonds at different longitudes show that the westward velocity of the frontt of PJ development is close to the gradient drift velocity of 20 keV ions (forming nose events). Thus, the physical mechanism of PJ formation due to energetic ion injection during a strong substorm burst is experimentally confirmed. Satellite measurements show that in the near midnight sector energetic ions reach the shell L=3.0 in 20-30 minutes after a substorm commencement with AE>500 nT.
Formation of polarization jet during injection of ions into the inner magnetosphere / V. L. Khalipov, Yu. I. Galperin, A. E. Stepanov, E. D. Bondar // Physics of auroral phenomena : proceedings of the 25th annual seminar, Apatity, 26 February – 1 March 2002. – 2002. – P. 43-46.
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