Abstract
Results of experimental studies of the electron concentration and near-solar plasma velocity dependences on the heliocentric distance obtained in 1970–2012 by the method of radio transillumination by signals of spacecraft for the region of 3–50 solar radii are presented. A comparative analysis of different approximations of these dependences is given and it is shown that joint analysis of the data on the plasma velocity and concentration with allowance for independence of the plasma integral flux on the heliocentric distance makes it possible to find analytical expressions corresponding well to experimental data. Analytical approximations and graphs of dependences of the velocity, concentration, acceleration, force, and kinetic energy on the distance in the regions of solar wind acceleration for low and moderate solar activity are presented.
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REFERENCES
Hollweg, J.V. and Harrington, J., Properties of solar wind turbulence deduced from radio measurements, J. Geophys. Res.: Space Phys., 1968, vol. 73, no. 23, pp. 7221–7250.
Goldstein, R.M., Superior conjunction of Pioner-6, Science, 1969, vol. 166, no. 3905, pp. 598–601.
Yakovlev, O.I., Molotov, E.P., Kruglov, Yu.M., et al., Peculiarities of radiowave propagation in the circumsolar plasma according to Mars-2 and Mars-7 spacecraft data, Radiotekh. Elektron., 1977, vol. 22, no. 2, pp. 260–267.
Kolosov, M.A., Yakovlev, O.I., Efimov, A.I., et al., Study of the propagation of decimeter radio waves in the circumsolar plasma during the flight of the Venera-10 interplanetary spacecraft, Radiotekh. Elektron., 1978, vol. 23, no. 9, pp. 1829–1839.
Bird, M.K. and Edenhofer, P., Remote sensing observations of the solar corona, in Physics of the Inner Heliosphere, Schwenn, R., Ed., Berlin: Springer, 1990, pp. 13–92.
Armand, N.A., Efimov, A.I., and Yakovlev, O.I., A model of the solar wind turbulence from radio occultation experiments, Astron. Astrophys., 1987, vol. 183, no. 1, pp. 135–141.
Armand, N.A., Gulyaev, Yu.V., Gavrik, A.L., et al., Results of solar wind and planetary ionosphere research using radiophysical methods, Phys.-Usp., 2010, vol. 53, no. 5, pp. 517–523.
Saito, K., Poland, A., and Munro, R., A structure of the background corona near solar minimum, Sol. Phys., 1977, vol. 55, no. 1, pp. 121–132.
Dollfus, A. and Mouradian, Z., Electron in the solar corona, Sol. Phys., 1981, vol. 70, no. 1, pp. 3–14.
Patoul, J., Foullon, C., and Riley, P., 3D electron density distributions in the solar corona during solar minima, Astrophys. J., 2015, vol. 814, no. 1, id 68. https://doi.org/10.1088/0004-637X/814/1/68
Muhleman, D.O., Esposito, P.B., and Anderson, J.D., The electron density profile of the outer corona and the interplanetary medium from Mariner-6 and Mariner-7 time-delay measurements, Astrophys. J., 1977, vol. 211, no. 3, pp. 943–956.
Muhleman, D.O. and Anderson, J.D., Solar wind electron densities from Viking dual-frequency radio measurements, Astrophys. J., 1981, vol. 247, no. 3, pp. 1093–1101.
Verma, A.K., Fienga, A., Laskar, J., et al., Electron density distribution and solar plasma correction of radio signals using MGS, MEX and VEX spacecraft navigation data and its application to planetary ephemerides, Astron. Astrophys., 2013, vol. 550, pp. 205–214.
Esposito, P.B., Edenhofer, P., and Lueneburg, E., Solar corona electron distribution, J. Geophys. Res., 1980, vol. 85, no. A7, pp. 3414–3418.
Anderson, J.D., Krisher, T.P., Borutzki, S.E., et al., Radio range measurements of coronal electron densities at 13 and 3.6 centimeter wavelengths during the 1985 solar conjunction of Voyager-2, Astrophys. J., 1987, vol. 323, no. 2, pp. L141–L150.
Yakovlev, O.I., Efimov, A.I., Razmanov, V.M., and Shtrykov, V.K., Inhomogeneous structure and velocity of the circumsolar plasma based on Venera-10, Astron. Zh., 1980, vol. 57, no. 4, pp. 790–798.
Efimov, A.I., Yakovlev, O.I., Shtrykov, V.K., et al., Separated observations of frequency and phase fluctuations of radio waves scattered by the circumsolar plasma, Radiotekh. Elektron., 1981, vol. 26, no. 2, pp. 311–318.
Kolosov, M.A., Yakovlev, O.I., Efimov, A.I., et al., Decimeter radio wave propagation in the turbulent plasma near the Sun, using Venera-10 spacecraft, Radio Sci., 1982, vol. 17, no. 3, pp. 664–674.
Yakovlev, O.I., Efimov, A.I., and Rubtsov, S.N., Dynamics and turbulence of the solar wind in the region of its formation according to radio occultation data from Venera-15 and Venera-16 space probes, Kosm. Issled., 1987, vol. 25, no. 2, pp. 251–257.
Rubtsov, S.N., Yakovlev, O.I., and Efimov, A.I., Plasma concentration and inhomogeneity and the solar wind kinetic energy according to radio occultation data from Venera-15 and Venera-16 space probes, Kosm. Issled., 1987, vol. 25, no. 4, pp. 620–625.
Yakovlev, O.I., Efimov, A.I., and Rubtsov, S.N., Solar wind from radio occultation data from Venera-15 and Venera-16 space probes, Astron. Zh., 1988, vol. 65, no. 6, pp. 1290–1299.
Yakovlev, O.I., Efimov, A.I., Yakubov, V.P., et al., Occultation of the plasma near the Sun and the speed of the solar wind: Fluctuations in the frequency and phase of radio waves at two separated points, Radiophys. Quantum Electron., 1989, vol. 32, no. 5, pp. 391–396.
Imamura, T., Tokumaru, M., Isobe, H., et al., Outflow structure of the quiet sun corona probed by spacecraft radio scintillations in strong scattering, Astrophys. J., 2014, vol. 788, pp. 117–127.
Krisher, T.P., Anderson, J.D., Morabito, D.D., et al., Radio range measurements of coronal electron densities at 13 and 3.6 centimeter wavelengths during the 1988 solar conjunction of Voyager-2, Astrophys. J., 1991, vol. 375, no. 2, pp. L57–L60.
Veselovsky, I.S., Dmitriev, A.V., and Suvorova, A.V., Algebra and statistics of the solar wind, Cosmic Res., 2010, vol. 48, no. 2, pp. 113–128.
Schwenn, R., Solar wind sources and their variations over the solar cycle, Space Sci. Rev., 2006, vol. 124, pp. 51–76.
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Yakovlev, O.I., Yakovlev, Y.O. Analysis of Radial Dependences of the Electron Concentration and Plasma Velocity in the Region of Accelerated Solar Wind. Cosmic Res 57, 237–242 (2019). https://doi.org/10.1134/S0010952519040087
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DOI: https://doi.org/10.1134/S0010952519040087