ANGEO Annales Geophysicae ANGEO Ann. Geophys. 1432-0576 Copernicus Publications Göttingen, Germany 10.5194/angeo-26-2053-2008 Pc5 waves generated by substorm injection: a case study Zolotukhina N. A. 1 Mager P. N. 1 Klimushkin D. Yu. 1 Institute of Solar-Terrestrial Physics, P.O. Box 291, 664033 Irkutsk, Russia 28 07 2008 26 7 2053 2059 Copyright: © 2008 N. A. Zolotukhina et al. 2008 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://angeo.copernicus.org/articles/26/2053/2008/angeo-26-2053-2008.html The full text article is available as a PDF file from https://angeo.copernicus.org/articles/26/2053/2008/angeo-26-2053-2008.pdf

We analyzed the spectral-polarized characteristics of Pc5 ULF waves observed on 17 September 2000 after the 03:20:25 UT substorm onset with the satellites GOES 8 and 10 located east and west of the onset location. In the course of the event, the wave polarization changed from mixed (between toroidal and poloidal) to poloidal, and then to mixed again. The hodogram of magnetic field oscillations rotated counterclockwise at GOES 8, and clockwise at GOES 10. It is suggested that the satellites detected the waves generated by the substorm injected clouds of the charged particles drifting in the magnetosphere in the opposite azimuthal directions: GOES 8 (located east of the substorm onset) detected the wave generated by an electron cloud, and GOES 10 (west of the onset) detected the wave generated by a positive ion cloud. This interpretation is confirmed by the energetic particles data recorded by LANL satellites.

 References Anderson, B J., Potemra, T A., Zanetti, L J., and Engebretson, M J.: Statistical correlation between Pc3–5 pulsations and solar wind/IMF parameters and geomagnetic indices, in: Physics of Space Plasmas (1990) SPI Conference Proceedings and Reprint Series, vol. 10, edited by: Chang, T., Crew, G B., and Jasperse, J B., Scientific Publishers Inc., Cambridge, Massachusetts, pp. 419–429, 1991. Eriksson, P T I., Blomberg, L G., Walker, A D M., and Glassmeier, K.-H.: Poloidal ULF oscillations in the dayside magnetosphere: a Cluster study, Ann. Geophys., 23, 2679–2686, 2005. Frey, H U., Mende, S B., Angelopoulos, V., and Donovan, E F.: Substorm onset observations by IMAGE-FUV, J. Geophys. Res., 109, A10304, https://doi.org/10.1029/2004JA010607, 2004. Guglielmi, A V. and Zolotukhina, N A.: Excitation of Alfvén oscillations of the magnetosphere by the asymmetric ring current, Issled. Geomagn. Aeron. i Fiz. Solntsa, 50, 129–137, 1980 (in Russian). Hasegawa, A.: Drift mirror instability in the magnetosphere, Phys. Pluids. 12, 2642–2650, 1969. Karpman, V I., Meerson, B I., Mikhailovsky, A B., and Pokhotelov, O A.: The effects of bounce resonances on wave growth rates in the magnetosphere, Planet. Space. Sci., 25, 573–585, 1977. Kim, K.-H., Cattell, C A., Lee, D.-H., Takahashi, K., Yumoto, K., Shiokawa, K., Mozer, F S., and Andre, M.: Magnetospheric responses to sudden and quasiperiodic solar wind variations, J. Geophys. Res., 107(A11), 1406, https://doi.org/10.1029/2002JA009342, 2002. Klimushkin, D Yu.: How energetic particles construct and destroy poloidal high-$m$ Alfvén waves in the magnetosphere, Planet. Space Sci., 55, 722–730, 2007. Klimushkin, D Yu. and Chen, L.: Eigenmode stability analysis of drift-mirror modes in nonuniform plasmas, Ann. Geophys., 24, 2435–2439, 2006. Leonovich, A S. and Mazur, V A.: Standing Alfvén waves in an axisymmetric magnetosphere excited by a non-stationary source, Ann. Geophys., 16, 914–920, 1998. Mager, P N. and Klimushkin, D Yu.: Spatial localization and azimuthal wave numbers of Alfvén waves generated by drift-bounce resonance in the magnetosphere, Ann. Geophys., 23, 3775–3784, 2005. Mager, P N. and Klimushkin, D Yu.: Generation of Alfvén waves by a plasma inhomogeneity moving in the Earth's magnetosphere, Plasma Physics Reports, 33, 391–398, 2007. Mager, P N. and Klimushkin, D Yu.: Alfvén ship waves: high-$m$ ULF pulsations in the magnetosphere, generated by a moving plasma inhomogeneity, Ann. Geophys., 26, 1653–1663, 2008. Mann, I R. and Wright, A N.: Finite lifetimes of ideal poloidal Alfvén waves, J. Geophys. Res., 100, 23 677–23 686, 1995. Marmet, P.: New digital filter for the analysis of experimental data, Rev. Sci. Instr., 50, 79–83, 1979. Pokhotelov, O A., Pilipenko, V A., Nezlina, Yu M., Woch, J., Kremser, G., Korth, A., and Amata, E.: Excitation of high-beta plasma instabilities at the geostationary orbit: theory and observations, Planet. Space Sci., 34, 695–712, 1986. Rankin, D. and Kurtz, R.: Statistical study of micropulsation polarizations, J. Geophys. Res., 75, 5444–5458, 1970. Roederer, J G.: Dynamics of geomagnetically trapped radiation, Springer-Verlag, New York, 1970. Rostoker, G. and Lam, H.-L.: A generation mechanism for Pc5 micropulsations in the morning sector, Planet. Space Sci., 26, 493–505, 1978. Saka, O., Iijima, T., Yamagishi, H., Sato, N., and Baker, D N.: Excitation of Pc 5 pulsations in the morning sector by a local injection of particles in the magnetosphere, J. Geophys. Res., 97, 10 693–10 701, 1992. Southwood, D J.: Low frequency pulsation generation by energetic particles, J. Geomagn. Geoelectr., Suppl. II, 32, 75–88, 1980. Schäfer, S, Glassmeier, K.-H., Eriksson, P T I., Pierrard, V., Fornasson, K.-H., and Blomberg, L G.: Spatial and temporal characteristics of poloidal waves in the terrestrial plasmasphere: A CLUSTER Case Study, Ann. Geophys., 25, 1011–1024, 2007. Wright, D M., Yeoman, T K., Rae, I J., Storey, J., Stockton-Chalk, A B., Roeder, J L., and Trattner, K J.: Ground-based and Polar spacecraft observations of a giant (Pg) pulsation and its associated source mechanism, J. Geophys. Res., 106, 10 837–10 852, 2001. Yeoman, T K., Wright, D M., Chapman, P J., and Stockton-Chalk, A B.: High-latitude observations of ULF waves with large azimuthal wavenumbers, J. Geophys. Res., 105, 5453–5462, 2000. Zolotukhina, N A.: On excitation of Alfvén waves in the magnetosphere by a moving source, Issled. Geomagn. Aeron. i Fiz. Solntsa, 34, 20–23, 1974 (in Russian).