Changes of plasma parameters in Earth magnetosphere tail during substorm initialization

1Kozak, LV, 1Petrenko, BA, 2Kronberg, EA, 3Grigorenko, EE, 4Kozak, PM, 1Reka, KD
1Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
2Max Planck Institute, Göttingen, Germany
3Russian Space Research Institute, Moscow, Russia
4Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
Kinemat. fiz. nebesnyh tel (Online) 2020, 36(2):82-96
Start Page: Dynamics and Physics of Solar System Bodies
Language: Ukrainian

A chain of events accompanying appearance of a substorm in Earth ionosphere and magnetosphere is considered. Features of geomagnetic pulsations and mechanism of their generation are indicated. Measurements of magnetic field fluctuations from ferro-probe magnetometers (sample rate 22.4 Hz), and also the data on temperature, velocity, and density of electrons, and different types of ions from the experiment PEACE and CIS-CODIF (sample rate 0.125...0.25 Hz) of space mission Cluster-2 have been analyzed. It was obtained that during the initiation of substorm, which was accompanied by dipolarization (sharp change of magnetic field configuration from the elongated to the tail force lines to more dipole structure) one can observe changing the plasma parameters. In particular it was registered the changes of concentration, significant increase of temperature, and increasing fluctuations of the velocity components with the increase of z-component. The time shift of heating protons and oxygen ions, and also density changing was detected. During the substorm electron density exceeds in order one of helium ions, and almost in two orders one of oxygen ions; Alfven velocity is near 470 km/s, and parameter beta characterizing the ratio of thermal pressure to magnetic one exceeds a unity. Using wavelet analysis the comparison of wave characteristics for different pressures was carried out. The pressure of magnetic field, and also dynamic and thermal pressure for different types of particles was considered. In fluctuations of the magnetic field pressure, thermal pressure of electrons and protons the Pc5 and powerful Pc4 pulsations (45...150 s), and also direct and inverse cascades was observed. At this the direct cascades point to the decay of larger structures, as a result of which one could observe the transfer from lower to higher frequencies, and on the contrary the reverse cascades are characterized by the transfer from higher to lower frequencies, and by the presence of merging (self-organization) of small structures into larger ones. The obtained results point to significant role of kinetic effects in the complex chain of processes in Earth magnetosphere in the period of explosive phase of substorm.

Keywords: Earth magnetosphere tail, Pc pulsations; magnetic, substorm, thermal and dynamic pressure in Earth magnetosphere tail; role of electrons in Earth magnetosphere

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