Abstract
We present the results of temperature and density measurement of plasmaspheric protons under quiet and disturbed conditions in the night and dayside sectors of the plasmasphere obtained with the Auroral Probe/Alpha-3 instrument during September 1996 and January 1997. According to the experimental data, the proton temperature in the night sector of the plasmasphere depends on the level of geomagnetic disturbance: it is found that at night hours the values of temperatures inside the plasmasphere at 2.4 < L < 3.5 decreased considerably after the commencement of a geomagnetic storm. The temperature decrease, as a rule, was accompanied by the formation of a flat plateau on the density distribution n(L) at 2.4 < L < 3.5. The above experimental facts (decreasing proton temperature and formation of a flat part on the n(L) distribution) allow us to conclude that the decrease in the proton temperature in the night sector of the plasmasphere connected with magnetic disturbances is caused by the filling of field tubes (depleted after the commencement of the storm) with colder ionospheric plasma. The proton temperature in the dayside sector of the plasmasphere virtually does not depend on the level of the geomagnetic disturbance.
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REFERENCES
Carpenter, D.L., Whistler Studies of the Plasmapause in the Magnetosphere, 1. Temporal Variations in the Position of the Knee and Some Evidence on Plasma Motions near the Knee, J. Geophys. Res., 1966, vol. 71, pp. 693–709.
Gringauz, K.I. and Bezrukikh, V.V., Asymmetry of the Earth's Plasmasphere in the Direction Noon-Midnight from Prognoz-1 and Prognoz-2 Data, J. Atmospheric Terrestrial Phys., 1976, vol. 38, pp. 1071–1076.
Chappell, C.R., Harris, K.K., and Sharp, G.W., A Study of the Influence of Magnetic Activity on the Location of the Plasmapause as Measured by OGO-5, J. Geophys. Res., 1970, vol. 75, pp. 50–56.
Decreau, P.M.E., Beghin, C., and Parrot, M., Global Characteristics of the Cold Plasma in the Equatorial Plasmasphere Region as Deduced from the GEOS 1 Mutual Impedance Probe, J. Geophys. Res., 1982, vol. 87, pp. 695–702.
Lemaire, J.F. and Gringauz, K.I., The Earth's Plasmasphere, Cambridge University Press, 1998, pp. 312–346.
Park, C.G., Whistler Observations of the Interchange of Ionization between the Ionosphere and the Protonosphere, J. Geophys. Res., 1970, vol. 75, pp. 4249–4260.
Park, C.G., Westward Electric Fields as the Cause of Night-Time Enhancement in Electron Concentration in Midlatitude F Region, J. Geophys. Res., 1971, vol. 76, pp. 4560–4566.
Park, C.G., Whistler Observations of the Depletion of the Plasmasphere during a Magnetosperic Substorm, J. Geophys. Res., 1973, vol. 78, pp. 672–683.
Degenhardt, M., Hartmann, G.K., and Leitingen, R., Effects of a Magnetic Storm in the Plasmaspheric Electron Content, J. Atmospheric and Terrestrial Phys., 1977, vol. 39, pp. 1435–1440.
Clilverd, M.A., Jenkins, B., and Thomson, N.R., Plasmaspheric Storm Time Erosion, J. Geophys. Res., 2000, vol. 105, pp. 12997–13008.
Carpenter, D.L., Anderson, R.R., Calvert, W., and Moldvin, M.B., CRRES Observations of Density Cavities inside the Plasmasphere, J. Geophys. Res., 2000, vol. 105, pp. 23323–23338.
Carpenter, D.L. and Anderson, R.R., An ISEE/Whistler Model of Equatorial Electron Density in the Magnetosphere, J. Geophys. Res., 1992, vol. 97, pp. 1097–1108
Carpenter D.L., Giles B.L., Chappell C.R. et al. Plasmasphere Dynamics in the Dusk-Side Bulge Region: A New Look at an Old Topic, J. Geophys. Res., 1993, vol. 98, pp. 19243–19271.
Park, C.G., Carpenter, D.L., and Wiggin, D.B., Electron Density in the Plasmasphere: Whistler Data on Solar Cycle, Annual, and Diurnal Variations, J. Geophys. Res., 1978, vol. 83, pp. 3137–3144.
Carpenter, D.L. and Lemaire, J., Erosion and Recovery of the Plasmasphere in the Plasmapause Region, Space Sci. Rev., 1997, vol. 80, pp. 153–179.
Bezrukikh, V.V., Verigin, M.I., Kotova, G.A., et al., Dynamics during Magnetic Storms as Observed by the Auroral Probe/Alpha-3 Experiment, Phys. Chem. Earth, 2000, vol. 25, pp. 19–22.
Bezrukikh, V.V., Verigin, M.I., Kotova, G.A., et al., Plasmapause Dynamics and Distribution of Cold Plasma Density in the Earth's Plasmasphere in the Course of Development of Geomagnetic Storms: Results of the Auroral Probe/Alpha-3 Experiment, Kosm. Issled., 2000, vol. 38, no. 5, pp. 536–548.
Bezrukikh, V.V., Verigin, M.I., Kotova, G.A., et al., Dynamics of the Plasmasphere and Plasmapause under the Action of Geomagnetic Storms, J. Atmosph. Solar-Terrestr. Phys., 2001, vol. 63, pp. 1179–1184.
Comfort, R.H., Plasmasphere Thermal Structure as Measured by ISEE-1 and DE-1, Adv. Space Res., 1986, vol.6, pp. 31–40.
Comfort, R.H., Thermal Structure of the Plasmasphere, Adv. Space Res., 1996, vol. 17, pp. 175–184.
Khazanov, G.V., Rasmussen, C.E., Konikov, Yu.V., et al., Effect of Magnetospheric Convection on Thermal Plasma in the Inner Magnetosphere, J. Geophys. Res., 1994, vol. 99, pp. 5923–5934.
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Bezrukikh, V.V., Kotova, G.A., Lezhen, L.A. et al. Dynamics of Temperature and Density of Cold Protons of the Earth's Plasmasphere Measured by the Auroral Probe/Alpha-3 Experiment Data during Geomagnetic Disturbances. Cosmic Research 41, 392–402 (2003). https://doi.org/10.1023/A:1025013828230
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DOI: https://doi.org/10.1023/A:1025013828230