Abstract
It is proposed to use the coefficient of asymmetry of the distribution function of fluctuations of a scintillating source flux density as a parameter that characterizes interplanetary turbulent plasma. It is demonstrated that this parameter can be measured with a differential method and that its informative capacity is equivalent to that of the source scintillation index. A series of test observations of scintillations was performed with the Large Phased Array antenna of the Lebedev Institute of Physics, Russian Academy of Sciences, simultaneously with measurements of the source scintillation indices and coefficients of asymmetry. Comparative analysis of the measured quantities showed that the coefficient of asymmetry within a numerical coefficient equals the source scintillation index, normalized to the flux density of the scintillating component. The coefficient of asymmetry makes it possible to restore scintillation indices when the radio sources are weak and it is difficult to measure their mean flux densities, and, hence, it enlarges the number of observable scintillating sources and makes the exploration of interplanetary plasma by means of the mapping of scintillation indices more efficient.
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REFERENCES
Artyukh, V.S. and Shishov, V.I., A Statistical Analysis of Scintillating Radio Sources, Astron. Zh., 1982, vol. 59, pp. 896–902 [Sov. Astron. (Engl. Transl.), 1982, vol. 26, p. 542].
Bourgois, G., A Theoretical Study of the Higher Moments of the Interplanetary Scintillation, Astron. Astrophys., 1972, vol. 21, pp. 33–40.
Bourgois, G. and Cheynet, G., Observations of the Interplanetary Medium and the Structure of the Radio Sources Using the Higher Moments of the Interplanetary Scintillation, Astron. Astrophys., 1972, vol. 21, pp. 26–32.
Gapper, C.R., Hewish, A., Purvis, A., and Daffett-Smith, P.J., Observing Interplanetary Disturbances from the Ground, Nature, 1982, vol. 296, pp. 633–636.
Hill, R.J., Frehlich, R.G., and Otto, W.D., The Probability Distribution of Irradiance Scintillation, NOAA Tech. Memo. ETL-274, Boulder: NOAA Environ. Res. Lab., 1996.
Hill, R.J. and Frehlich, R.G.J., Probability Distribution of Irradiance for the Onset of Strong Scintillation, Opt. Soc. Am. Astron., 1997, vol. 14, pp. 1530–1540.
Janaradhan, P., Balasubramanian, V., Ananthakrishnan, S., et al., Travelling Interplanetary Disturbances Detected Using Interplanetary Scintillation at 327 MHz, Solar Phys., 1996, vol. 166, pp. 379–401.
Mercier, R.P., Diffraction by a Screen Causing Large Random Phase Fluctuations, Proc. Cambridge Philos. Soc., 1962, vol. 58, pp. 382–400.
Readhead, A.C.S. and Hewish, A., Fine Structure in Radio Sources at 81.5 MHz-III. The Survey, Mem. R. Astron. Soc, 1974, vol. 78, pp. 1–49.
Shishov, V.I. and Pynzar’, A.V., Influence of Source Size and Receiver Bandwidth on the Coefficient of Asymmetry of Interplanetary Scintillations, Izv. Vyssh. Uchebn. Zaved., Radiofiz., 1975, vol. 18, pp. 506–509.
Shishov, V.I., Vlasov, V.I., and Kojima, M., Structure of Interplanetary Shock Waves from Radio Scintillation Data, Solar Phys., 1997, vol. 176, pp. 373–386.
Shishov, V.I., Smirnova, T.V., and Tyul’bashev, S.A., Coefficient of Asymmetry of Interstellar Scintillations of Extragalaxy Radiosources, Astron. Zh., 2005 (in press).
Tatarskii, V.I., Rasprostranenie voln v turbulentnoi atmosfere, Moscow: Nauka, 1967. Translated under the title Wave Propagation in a Turbulent Medium, New York: McGraw-Hill, 1961.
Tokumaru, M., Kojima, M., Fujiki, K., and Yakobe, A., Three-Dimensional Propagation of Interplanetary Disturbances Detected with Radio Scintillation Measurements at 327 MHz, J. Geophys. Res., 2000, vol. 105, pp. 10435–10454.
Vlasov, V.I., Radio Imagery of the Turbulent Interplanetary Plasma, Astron. Zh., 1979, vol. 56, pp. 96–105 [Sov. Astron. (Engl. Transl.), 1979, vol. 23, p. 55].
Vlasov, V.I., Interplanetary Shock Waves from Observations of Radio Scintillations, Geomagn. Aeron., 1981, vol. 21, pp. 927–929.
Vlasov, V.I., The Interplanetary Plasma in an 11-year Cycle of Solar Activity (According to Radio-Astronomical Data), Geomagn. Aeron., 1983, vol. 23, pp. 475–477.
Vlasov, V.I., Shishov, V.I., and Shishova, T.D., Large-Scale Structure of the Interplanetary Plasma, Pis’ma Astron. Zh., 1976, vol. 2, pp. 248–250 [Sov. Astron. Lett. (Engl. Transl.), 1976, vol. 2, pp. 97–98].
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Translated from Astronomicheskii Vestnik, Vol. 39, No. 4, 2005, pp. 375–380.
Original Russian Text Copyright © 2005 by Shishov, Tyul’bashev, Artyukh, Subaev, Chashei, Chernikov.
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Shishov, V.I., Tyul’bashev, S.A., Artyukh, V.S. et al. The Coefficient of Asymmetry of Radio-Source Interplanetary Scintillation. Sol Syst Res 39, 333–338 (2005). https://doi.org/10.1007/s11208-005-0047-9
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DOI: https://doi.org/10.1007/s11208-005-0047-9