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1.
The discrepancy between the model and measured magnetic fields, which can be described by the contribution of field-aligned currents, has been determined. The division of the initial data array into the individual data sets with different IMF values makes it possible to estimate the dependence of field-aligned currents on IMF. 相似文献
2.
Yu.P. Maltsev 《Planetary and Space Science》1983,31(6):659-666
The motion of a space-limited energetic electron bunch injected along geomagnetic field lines is studied. Dimensions of a bunch moving in a weakly inhomogeneous medium are shown to change so that a product of the bunch and background densities divided by a square of the magnetic field appears to be an adiabatic invariant. The bunch decelerates when its density tends to the background electron density. 相似文献
3.
As shown by Iwasaki (1971); Maezawa (1976); Kuznetsov and Troshichev (1977) and other investigators, the electric field and the plasma convection in the polar cap change their direction after an appearance of a significant northward component of the interplanetary magnetic field. Two possible mechanisms of this phenomenon may be suggested: (i) the direct penetration of the dusk-to-dawn electric field from the solar wind into the magnetosphere, and (ii) the generation of the observed electric field and convection in a process of the decay of the three-dimensional current system which existed before the appearance of the northward interplanetary field. The latter mechanism implies that the value of the electric field generated in the polar cap will decrease with time after the appearance of the northward interplanetary magnetic field. The results of the experimental investigation show such a decrease which favours the second mechanism. 相似文献
4.
V. A. Liperovsky R. M. Umarkhodjaev V. V. Mikhailin V. V. Bogdanov S. A. Maltsev E. V. Liperovskaya A. V. Kaisin E. G. Leksina 《Seismic Instruments》2010,46(3):286-292
A method of remote sensing of local electrical fields with a mosaic spread in the atmosphere is described. The proposed method
is based on searching for sources of infrared radiation by scanning the atmosphere and on analyzing the radiation spectrum. 相似文献
5.
It is assumed that the original impulse producing Pi-2 pulsations is generated in the ionosphere at the moment of a brightening of aurora. The electric field is known to decrease in the auroral arc almost by an order of magnitude. The electric impulse that appears will be transferred along magnetic field lines and reflected from the ionosphere of the opposite hemisphere, forming the standing Alfvén wave. The electric field impulse of 100 is capable of causing magnetic field oscillations of order of 100 γ. Reflection of the Alfvén impulse from the ionosphere with horizontal inhomogeneities corresponding to different forms of auroras is studied. The following is found: (a) the resonance is possible only for harmonics with the rotating vector of polarization; (b) the resonance periods appear to depend essentially on the ionospheric conductivity; this may bring a significant error into determination of the magnetospheric plasma density from the pulsation periods; (c) the auroral zone exerts a screening influence on the pulsations excited at latitudes higher than the zone itself. 相似文献
6.
V. K. Roldugin Yu. P. Maltsev A. A. Ostapenko A. V. Roldugin 《Geomagnetism and Aeronomy》2006,46(4):438-449
Pulsations in the electron fluxes and magnetic field on two geosynchronous satellites and at several ground-based observatories have been studied. Relativistic electron flux pulsations with a period of 6 min originated after the shock arrival from the solar wind at 0258 UT on February 11, 2000, had a regular character, and propagated from the dayside to the nightside at a velocity of about 60 deg min?1. Magnetic field oscillations on the satellites and on the Earth had a more complicated structure. Field oscillations morphologically similar to electron oscillations are observed only on one satellite in one component and at one-two ground-based stations, where a periodicity of 10–12 min was mainly observed. It is assumed that magnetic pulsations are Alfvén resonances generated by a fast magnetosonic wave. 相似文献
7.
Using the empirical magnetic field model dependent on the Dst index and solar wind dynamic pressure, we calculated the behaviour of the contour B = Bs in the equatorial plane of the magnetosphere where Bs is the magnetic field in the subsolar point at the magnetopause. The inner domain of the magnetosphere outlined by this contour contains the bulk of geomag-netically trapped particles. During quiet time the boundary of the inner magnetosphere passes at the distance ∼10RE at noon and at ∼7RE at midnight. During very intense storms this distance can be reduced to 4–5 RE for all MLT. The calculation results agree well with the satellite measurements of the magneto-pause location during storms. The ionospheric projection of the B = Bs contour calculated with the Euler potential technique is close to the equatorward edge of the auroral oval. 相似文献
8.
Solotchina E. P. Kuzmin M. I. Solotchin P. A. Maltsev A. E. Leonova G. A. Krivonogov S. K. 《Doklady Earth Sciences》2021,496(1):17-23
Doklady Earth Sciences - We present the results of studying the Holocene sediments of Bolshie Toroki Lake, a shallow brackish lake with carbonate sedimentation and high bioproductivity, located in... 相似文献
9.
An automated hardware-software station was designed at the Institute of Physics of the Earth (Moscow, Russia) for the continuous monitoring of a low-frequency electromagnetic background in a low atmosphere. The electromagnetic signal is processed in real time and an attempt is made to find and confirm the possible precursors of earthquakes. The basic concepts of electromagnetic earthquake precursors are described, as well as a technique of data recording and processing for obtaining the most accurate prediction. The design of the station is based on up-to-date hardware components and can be integrated with additional detectors if necessary. It is assumed that stations can be combined within monitoring networks of different scales. The net cost of the station is relatively low because only mainstream components are used. 相似文献
10.
V. C. Roldugin Ye. P. Maltsev A. N. Vasiljev E. V. Vashenyuk 《Annales Geophysicae》1999,17(10):1293-1297
The variations of the first mode of Schumann resonance are analyzed using data from Kola peninsula stations during the solar proton event of 6 November 1997. On this day the intensive flux of energetic protons on GOES-8 and the 10% increase of the count rate of the neutron monitor in Apatity between 1220 and 2000 UT were preceded by a solar X-ray burst at 1155 UT. This burst was accompanied by a simultaneous increase of the Schumann frequency by 3.5%, and the relativistic proton flux increase was accompanied by 1% frequency decrease. These effects are explained by changes of the height and dielectric permeability of the Earth-ionosphere cavity. 相似文献