Effects in the Geomagnetic Field and Absorption of Cosmic Radio Emission Caused by the Negative Pressure Discontinuity of the Solar Wind: Analysis of a Particular Event
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An abrupt decrease in the solar wind pressure and its effect on the magnetosphere and ionosphere during the event occurring on April 4, 1971, are studied. This event differs fundamentally from a typical sudden commencement (SC) of a geomagnetic storm or from a positive sudden impulse (SI+) and is determined as a negative sudden impulse (SI–). The geomagnetic variations at different latitudes and the cosmic radio emission in the auroral zone are analyzed. From the data of low-latitude geomagnetic observatories, several subsequent negative impulses observed with a periodicity of ~45 min were found. At the same time, a sudden decrease in the absorption of cosmic radio emission in the auroral zone was revealed. Possible physical explanations of the observed changes are discussed.
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- Belakhovsky, V.B., Safargaleev, V.V., and Yagodkina, O.I., Response of morning auroras and cosmic noise absorption to the negative solar wind pressure pulse: A case study, Opt. Pura Apl., 2011, vol. 44, no. 4, pp. 611–615.Google Scholar
- Driatskii, V.N., Priroda anomal’nogo pogloshcheniya kosmicheskogo radioizlucheniya v nizhnei ionosfere vysokikh shirot (The Nature of Abnormal Absorption of Cosmic Radio Radiation in the Lower Ionosphere of High Latitudes), Leningrad: Gidrometeoizdat, 1974.Google Scholar
- Huang, C.-S., Sofko, G.J., and Kustov, A.V., MacDougal, J.W., Andre, D.A, Hughes, W.J., and Papitashvili, V.O., Quasi-periodic ionospheric disturbances with a 40-min period during prolonged northward interplanetary magnetic field, Geophys. Res. Lett., 2000, vol. 27, no. 12, pp. 1795–1798.CrossRefGoogle Scholar
- Kleimenova, N.G., Sudden commencements of magnetic storms as a way of solar wind energy transfer into the Earth’s magnetosphere, Phys. Solar Terr., Potdsdam no. 23, 1984, pp. 59–82.Google Scholar
- Kleimenova, N.G. and Osepyan, A.R., VLF-emissions during sudden commencements of magnetic storms, Geomagn. Aeron., 1982, vol. 22, no. 4, pp. 681–683.Google Scholar
- Kleimenova, N.G., Kozyreva, O.V., Bitterly, J., and Schott, J.-J., Geomagnetic pulsations of the Pc3–5 range at the polar-cusp latitudes during an SCand their global response, Geomagn. Aeron. (Engl. Transl.), 1999, vol. 39, no. 4, pp. 428–437.Google Scholar
- Liou, K., Newell, P.T., Sotirelis, T., and Meng, C.-I., Global auroral response to negative pressure impulses, Geophys. Res. Lett., 2006, vol. 33, L11103. doi 10.1029/2006GL025933Google Scholar
- Manninen, J., Kleimenova, N.G., and Kozyreva, O.V., and Turunen, T., Pc5 geomagnetic pulsations, pulsating particle precipitation, and VLF chorus: Case study on 24 November 2006, J. Geophys. Res., 2010, vol. 115, A00F14. doi 10.1029/2009JA014837Google Scholar
- Manninen, J., Kleimenova, N.G., Turunen, T., and Gromova, L.I., Temporal behaviour of daytime VLF emissions caused by the solar wind and IMF disturbances: A case study, in Proceedings of the Eighth Workshop “Solar Influences on the Magnetosphere, Ionosphere and Atmosphere”, Sunny Beach, Bulgaria, 2016, pp. 39–42.Google Scholar
- Nishida, A., Geomagnetic Diagnosis of the Magnetosphere, New York: Springer, 1978; Moscow: Mir, 1980.Google Scholar
- Zhang, X.Y., Zong, Q.-G., Wang, Y.F., Zhang, H., Xie, L., Fu, S.Y., Yuan, C.J., Yue, C., Yang, B., and Pu, Z.Y., ULF waves excited by negative/positive solar wind dynamic pressure impulses at geosynchronous orbit, J. Geophys. Res., 2010, vol. 115, A10221. doi 10.1029/2009JA015016Google Scholar
- Zhou, X.-Y., Fukui, K., Carlson, H.C., Moen, J.I., and Strangeway, R.J., Shock aurora: Ground-based imager observations, J. Geophys. Res., 2009, vol. 114, A12216. doi 10.1029/2009JA014186Google Scholar