DOI: https://doi.org/10.24028/gzh.0203-3100.v42i2.2020.201741

Special features of the studies of deep electrical conductivity of the Moon and the Earth (once more on toroidal mode of natural magnetic field)

I.I. Rokityanskiy, A.V. Tereshyn

Abstract


Studies of the deep electrical conductivity of the Earth and the Moon are carried out by measuring and analyzing the natural electromagnetic (EM) fields excited by the solar wind, introducing an electric field of the order of 2 mV/m applied to the boundaries of the Earth’s magnetosphere or directly to the surface of the Moon. For a concentrically layered sphere with electrical conductivity σ = σ (r), the EM fields can be represented as the sum of two modes: electric with a toroidal magnetic field and magnetic with a poloidal magnetic field. Each of the modes is associated with electrical conductivity by different ratios/formulas and is characterized by different possibilities for studying the electrical conductivity inside a celestial body. It is generally accepted that currents from the boundary of the Earth’s magnetosphere descend along the geomagnetic field lines to the ionosphere, but do not reach the Earth due to the very high resistance of near-the-surface air layer (up to 1014 Ohm · m) and only poloidal fields of the magnetic mode are induced in the solid Earth. A review of the data on the global electric circuit shows that vertical currents penetrate from the atmosphere into the Earth and the electric mode is not equal to zero. Vertical currents are characterized by strong spatio-temporal variability. Separation of the modes from observation data was not carried out. On the Moon, the high-resistance layer is the lithosphere with regolith and breccias on its surface with a resistivity of 107―1012 Ohm · m. Spatial inhomogeneities of the Moon interior are considered and a conclusion is made about their multitude and intensity. Based on the analysis of the spatial distribution of tidal and tectonic moonquakes, it was suggested that they trace quasi-vertical structures like a plume. The results of observations of volcanism and transient lunar phenomena, obtained in recent years by orbital missions with high-resolution equipment, indicate an intense degassing of the moon. All this allows us to conclude that in the Moon there are quasi-vertical conductors supporting an electric mode. Proposals for the optimization of new studies of the electrical conductivity of the moon are substantiated and formulated. Deep studies of electrical conductivity are based on a theoretical model of the magnetic mode, the existence of the electrical mode is neglected, and it falls into unidentified noise, which by means of coherent analysis and multi-stage processing is largely eliminated and the conductivity models more or less correctly describe the real geoelectric structure of the Earth, but with probable systematic errors. Separation and study of the electric mode should be considered as an additional channel of information in EM studies of planets.


Keywords


electrical conductivity of the Moon and the Earth; solar wind; magnetosphere; ionosphere; degassing of the Earth and the Moon; global electric circuit

References


Aksenov, V.V. (1997). Toroidal field in the Earth’s atmosphere. Novosibirsk: Ed. of the Institute Computational Mathematics and Mathematical Geophysics of the Siberian Branch of the RAS, 133 p. (in Russian).

Benkova, N.P. (1941). Calm sunny diurnal variations. Moscow—Leningrad: Gidrometeoizdat, 71 p. (in Russian).

Vanyan, L.L., Berdichevskiy, M.N., Yegorov, I.V., Krass, M.S., Okuleskiy, B.A., & Fadeev, V.E. (1973). The apparent electrical resistance of the moon and its interpretation. Izvestiya AN SSSR. Fizika Zemli, (11), 3—12 (in Russian).

Berdichevskiy, M.N., Vanyan, L.L., Dmitriev, V.I., Zhdanov, M.S., Faynberg, E.B., & Kharin, E.P. (1979). International Symposium on Electromagnetic Induction in the Earth and the Moon. Izvestiya AN SSSR. Fizika Zemli, (7), 103—110 (in Russian).

Vinogradov, A.P. (Ed.). (1975). Cosmochemistry of the moon and planets. Moscow: Nauka, 765 p. (in Russian).

Galkin, I.N. (1978). Geophysics of the Moon. Moscow: Nauka, 176 p. (in Russian).

Imyanitov, I.M., & Kolokolov, V.P. (1976). The problem of the origin of the electric field of the atmosphere and modern ideas about atmospheric electricity. In Atmospheric electricity (pp. 5―22). Leningrad: Gidrometizdat (in Russian).

Kozyrev, N.A. (1959). Volcanic activity on the moon. Priroda, (3), 84―87 (in Russian).

Mareev, E.A. (2010). Achievements and prospects of research of the global electric circuit. Uspekhi fizicheskikh nauk, 180(5), 527―534. https://doi.org/10.3367/UFNr.0180.201005h.0527.

Rokityansky, I.I. (1981). Induction sounding of the Earth. Kiev: Naukova Dumka, 296 p. (in Russian).

Rokityansky, I.I., & Tereshin, A.V. (2010a). Deep magnetovariational sounding of the moon. Kosmichna nauka i tekhnologiya, 16(4), 57―65 (in Russian).

Rokityansky, I.I., & Tereshin, A.V. (2010b). The study of the electrical conductivity of the Moon (results and prospects). Geofizicheskiy zhurnal, 32(5), 69―81 (in Russian).

Ryabov, M.I., Sukharev, A.L., Orlyuk, M.I., Sobitnyak, L.I., & Romenets, A.A. (2019). Comparative analysis of geomagnetic disturbances in the Odessa magnetic anomaly area in the 24th solar activity cycle. Radiofizika i radioastronomiya, 24(1), 68―79 (in Russian).

Chetaev, D.N. (1985). Directional analysis of magnetotelluric observations. Moscow: Ed. of the Institute of Physics of the Earth, Academy of Sciences of the USSR, 203 p. (in Russian).

Shkuratov, Yu.G. (2006). Moon distant and near. Kharkov: Ed. of Kharkov National University, 184 p. (in Russian).

Adams, J. (2009). International lunar network update. NASA report 9.01.2009. Retrieved from www.lpi.usra.edu/pss/jan92009/presentations/ilnStatuspss.pdf.

Basilevsky, A.T., Abdrakhimov, A.M., & Dorofeeva, V.A. (2012) Water and Other Volatiles on the Moon: A Review. Solar System Research, 46(2), 89―107. https://doi.org/10.1134/S0038094612010017.

Crotts, A.P.S. & Hummels, C. (2009) Lunar outgassing, transient phenomena, and the return to the moon. II. Predictions and tests for outgassing. The Astrophysical Journal, 707(2), 1506―1523; doi: 10.1088/0004-637X/707/2/1506.

Christian, H.J., Blakeslee, R.J., Boccippio, D.J., Boeck, W.L., Buechler, D., Driscoll, K.T., Goodman, S.J., Hall, J.M., Koshak, W.J., & Mach, D.M. (2003). Global Frequency and Distribution of Lightning as Observed from Space by the Optical Transient Detector. Journal of Geophysical Research, 108(D1), ACL 4-1―ACL 4-15. https://doi.org/10.1029/2002JD002347.

Davidenko, D. & Pulinets, S. (2019). Deterministic variability of the ionosphere on the eve of strong (M  6) earthquakes in the regions of Greece and Italy according to long-term measurements data. Geomagnetism and Aeronomy, 59(4), 493―508. https://doi.org/10.1134/S001679321904008X.

Ivanov, A.V. (2014). Volatiles in Lunar Regolith Samples: A survey. Solar System Research, 48, 113―129. https://doi.org/10.1134/S0038094614020038.

Kozyrev, N.A. (1963). Volcanic Phenomena on the Moon. Nature, 198, 979―980. https://doi.org/10.1038/198979a0.

Olsen, N. & Stolle, C. (2017). Magnetic Signatures of Ionospheric and Magnetospheric Current Systems During Geomagnetic Quiet Conditions—An Overview. Space Science Reviews, 206, 5―25. https://doi.org/10.1007/s11214-016-0279-7.

Pulinets, S. & Davidenko, D.V. (2014). Ionospheric precursors of earthquakes and Global Electric Circuit. Advances in Space Research, 53(5), 709―723. http://dx.doi.org/10.1016/j.asr.2013.12.035.

Rapoport, Yu., Grimalsky, V., Krankowski, A., Pulinets, S., Fedorenko, A., & Petrishchevskii, S. (2020). Algorithm for modeling electromagnetic channel of seismo-ionospheric coupling (SIC) and the variations in the electron concentration. Acta Geophysica, 68, 253―278. https://doi.org/10.1007/s11600-019-00385-0.

Shkuratov, Y.G., Ivanov, M.A., Korokhin, V.V., Kaydash, V.G., Basilevsky, A.T., Videen, G., Hradyska, L.V., Velikodsky, Y.I., Marchenko, G.P. (2018). Characterizing dark mantle deposits in the lunar crater Alphonsus. Planetary and Space Science, 153, 22―38. https://doi.org/10.1016/j.pss.2017.12.010.

Van Vleuten, A. (1917). Over de dagelijsche variatie van het Ardmagnetisme (pp. 5―30). Koninklijk Ned. Meteor. Instit. № 102, Utrecht (in Dutch).

Varentsov, Iv.M. (2007). Arrays of simultaneous EM soundings: design, data processing and analysis. In V.V. Spichak (Ed.), EM sounding of the Earth.s interior (Vol. 40, pp. 259―273). Amsterdam: Elsevier.


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