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Magnetotail plasma flow during plasma sheet expansions: Vela 5 and 6 and Imp 6 observations

1977; American Geophysical Union; Volume: 82; Issue: 7 Linguagem: Inglês

10.1029/ja082i007p01235

2156-2202

A. T. Y. Lui, E. W. Hones, F. Yasuhara, S.‐I. Akasofu, S. J. Bame,

Geomagnetism and Paleomagnetism Studies

Journal of Geophysical Research (1896-1977)Volume 82, Issue 7 p. 1235-1244 Magnetotail plasma flow during plasma sheet expansions: Vela 5 and 6 and Imp 6 observations A. T. Y. Lui, A. T. Y. LuiSearch for more papers by this authorE. W. Hones Jr., E. W. Hones Jr.Search for more papers by this authorF. Yasuhara, F. YasuharaSearch for more papers by this authorS. -I. Akasofu, S. -I. AkasofuSearch for more papers by this authorS. J. Bame, S. J. BameSearch for more papers by this author A. T. Y. Lui, A. T. Y. LuiSearch for more papers by this authorE. W. Hones Jr., E. W. Hones Jr.Search for more papers by this authorF. Yasuhara, F. YasuharaSearch for more papers by this authorS. -I. Akasofu, S. -I. AkasofuSearch for more papers by this authorS. J. Bame, S. J. BameSearch for more papers by this author First published: 1 March 1977 https://doi.org/10.1029/JA082i007p01235Citations: 101AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Plasma flow during plasma sheet expansions is studied with extensive data from Vela 5 and 6 and IMP 6 satellites in the range X ≃ 0 to −30 RE. By combining statistically 44 flow observations by Vela 5 and 6 and 102 flow observations by IMP 6 it is concluded that the three-dimensional plasma flow direction within the expanding plasma sheet at −10 RE > X > −30 RE is, in general, sunward and approximately parallel to the equatorial plane. The flow speed is usually high (∼500–1000 km/s) in the midnight sector and is generally lower (less than ∼500 km/s) in the dawn and dusk sectors. The flow within a geocentric distance of ∼10 RE is less systematic. The average duration of the flow is ∼12 min. Our result suggests either that the high speed plasma flows are mostly confined near the upper and lower boundaries of the expanding plasma sheet (if it is assumed that the estimation of the distance dZ from the neutral sheet is reasonably accurate) or that the flow lasts for a short duration over the entire plasma sheet (if it is assumed that the dZ estimation is not accurate). The possible implication to the production of bright auroral arcs is discussed. References Akasofu, S.-I., Polar and Magnetospheric Substorms, 222, D. Reidel, Dordrecht, Netherlands, 1968. Akasofu, S.-I., E. W. Hones Jr., S. J. Bame, J. R. Asbridge, A. T. Y. Lui, Magnetotail and boundary layer plasmas at a geocentric distance of ˜18 RE Vela 5 and 6 observations, J. Geophys. Res., 78, 7257, 1973. Aubry, M. P., M. G. Kivelson, R. L. McPherron, C. T. Russell, D. S. Colburn, Outer magnetosphere near midnight at quiet and disturbed times, J. Geophys. Res., 77, 5487, 1972. Bame, S. J., E. W. Hones Jr., S.-I. Akasofu, M. D. Montgomery, J. R. Asbridge, Geomagnetic storm particles in the high-latitude magnetotail, J. Geophys. Res., 76, 7566, 1971. Frank, L. A., K. L. Ackerson, Examples of plasma flows within the earth's magnetosphereConference on Magnetospheric Particles and FieldsSummer Advanced Study Sch.Graz, AustriaAug., 1975. Hones Jr., E. W., Substorm phenomena in the distant magnetosphere, Proceedings of Solar Terrestrial Relations Conference 1972 D. Venkatesan, 125, University of Calgary, Calgary, Alberta, Canada, 1973a. Hones Jr., E. W., Magnetospheric plasma flow and the nature of the magnetospheric boundary layerSeventh ESLAB Symposium on Correlated Interplanetary and Magnetosphere ObservationsSauglau, Germany, 1973b. Hones Jr., E. W., J. R. Asbridge, S. J. Bame, I. B. Strong, Outward flow of plasma in the magnetotail following geomagnetic bays, J. Geophys. Res., 72, 5879, 1967. Hones Jr., E. W., S. Singer, C. S. R. Rao, Simultaneous observations of electrons (E > 45 keV) at 2000-kilometer altitude and at 100,000 kilometers in the magnetotail, J. Geophys. Res., 73, 7339, 1968. Hones Jr., E. W., S.-I. Akasofu, P. Perreault, S. J. Bame, S. Singer, Poleward expansion of the auroral oval and associated phenomena in the magnetotail during auroral substorms, 1, J. Geophys. Res., 75, 7060, 1970. Hones Jr., E. W., J. R. Asbridge, S. J. Bame, Time variations of the magnetotail plasma sheet at 18 RE determined from concurrent observations by a pair of Vela satellites, J. Geophys. Res., 76, 4402, 1971a. Hones Jr., E. W., J. R. Asbridge, S. J. Bame, S. Singer, Energy spectra and angular distributions of particles in the plasma sheet and their comparison with rocket measurements over the auroral zone, J. Geophys. Res., 76, 63, 1971b. Hones Jr., E. W., J. R. Asbridge, S. J. Bame, S.-I. Akasofu, Measurements of magnetotail plasma flow made with Vela 4B, J. Geophys. Res., 77, 5503, 1972. Hones Jr., E. W., J. R. Asbridge, S. J. Bame, S. Singer, Substorm variations of the magnetotail plasma sheet from XSM ≈ -6 RE to SSM ≈ -60 RE, J. Geophys. Res., 78, 109, 1973. Hones Jr., E. W., S. J. Bame, J. R. Asbridge, Proton flow measurements in the magnetotail plasma sheet made with Imp 6, J. Geophys. Res., 81, 227, 1976. Kan, J. R., Energization of auroral electrons by electrostatic shock waves, J. Geophys. Res., 80, 2089, 1975. Kan, J. R., S.-I. Akasofu, Energy source and mechanism for accelerating the electrons and driving the field-aligned currents of the discrete auroral arc, J. Geophys. Res., 81, 5123, 1976. Lui, A. T. Y., E. W. Hones Jr., D. Venkatesan, S.-I. Akasofu, S. J. Bame, Complete plasma dropouts at Vela satellites during thinning of the plasma sheet, J. Geophys. Res., 80, 4649, 1975. Lui, A. T. Y., S.-I. Akasofu, E. W. Hones Jr., S. J. Bame, C. E. Mcllwain, Observation of the plasma sheet during a contracted oval substorm in a prolonged quiet period, J. Geophys. Res., 81, 1415, 1976a. Lui, A. T. Y., D. Venkatesan, C. D. Anger, S.-I. Akasofu, W. J. Heikkla, J. D. Winningham, J. R. Burrows, Simultaneous observations of particle precipitations and auroral emissions by the Isis 2 satellite in the 19-24 MLT sector, J. Geophys. Res., 1976b. Russell, C. T., K. I. Brody, Some remarks on the position and shape of the neutral sheet, J. Geophys. Res., 72, 6104, 1967. Winningham, J. D., F. Yasuhara, S.-I. Akasofu, J. D. Heikkla, The latitudinal morphology of 10 eV to 10 keV electron fluxes during magnetically quiet and disturbed times in the 21-03 MLT sector, J. Geophys. Res., 80, 3148, 1975. Citing Literature Volume82, Issue7Space Physics1 March 1977Pages 1235-1244 ReferencesRelatedInformation