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Global picture of distribution of plasma pressure in the Earth’s magnetosphere and high latitude part of the ring currentтезисы доклада
- Авторы: Antonova E.E., Kirpichev I.P., Vovchenko V.V., Stepanova M.V.
- Сборник: Abstract Volume 12th Scientific Assembly International Association of Geomagnetism and Aeronomy (IAGA -2013 meeting)
- Тезисы
- Год издания: 2013
- Место издания: www.iaga2013.org.mx Merida, Mexico
- Первая страница: 224
- Последняя страница: 224
- Аннотация: The value and distribution of plasma pressure determine the configuration of large-scale transverse and fieldaligned currents in the magnetosphere of the Earth in the conditions of the magnetostatic equilibrium. The obtaining of the picture of plasma pressure distribution requires proper measurements of particle fluxes near the equatorial plane. However, due to slow motion of high apogee satellite such picture can be obtained only using statistically averaged measurements. The averaged distribution of plasma pressure until geocentric distance ~15Re is obtained using data of ESA and SST devices of 5-satellite THEMIS mission. Near to monotonic growth of plasma pressure with the decrease of geocentric distance is demonstrated. Such feature means the existence of westward-directed transverse current. The distribution of plasma pressure is compared with the results of magnetic field measurements by FGM magnetometer. The distribution of transverse current density is obtained. Obtained distribution demonstrates high values of current densities at the night sector and much low density near noon. However the distribution of current density does not show the distribution of the integral transverse current at geocentric distances >7Re as minimal values of the magnetic field are shifted from the equator to large Z in GSM coordinate system due to the daytime compression of the magnetosphere. Integral along field line values of transverse current are obtained using distribution of the magnetic field along field line in accordance with Tsyganenko-2001 model. It is shown that the obtained global distribution of transverse current demonstrates the existence of the high latitude continuation of the ordinary ring current until the magnetopause near noon. The role of this current system (named earlier the cut ring current - CRC) in the magnetospheric dynamics is discussed including magnetic storms and isolated substorms.
- Добавил в систему: Антонова Елизавета Евгеньевна