Radial variation of the interplanetary magnetic field between 0.3 AU and 1.0 AU - observations by the Helios-1 spacecraft

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G. Musmann
F.M. Neubauer
E. Lammers

Abstract

We have investigated the radial dependence of the radial and azimuthal components and the magnitude of the interplanetary magnetic field obtained by the Technical University of Braunschweig magnetometer experiment on-board of Helios-1 from December 10, 1974 to first perihelion on March 15, 1975. Absolute values of daily averages of each quantity have been employed. The regression analysis based on power laws leads to 2.55 γ x r-2.0 , 2.26 γ x r-1.0 and F = 5.53 γ x r-1.6 with standard deviations of 2.5 γ, 2.0 γ and 3.2 γ for the radial and azimuthal components and magnitude, respectively. Here r is the radial distance from the Sun in astronomical units. The results are compared with results obtained for Mariners 4, 5 and 10 and Pioneers 6 and 10. The differences are probably due to different epochs in the solar cycle and the different statistical techniques used.


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How to Cite
Musmann, G., Neubauer, F., & Lammers, E. (1976). Radial variation of the interplanetary magnetic field between 0.3 AU and 1.0 AU - observations by the Helios-1 spacecraft. Journal of Geophysics, 42(1), 591-598. Retrieved from https://journal.geophysicsjournal.com/JofG/article/view/113

References

Behannon, K. (1976) Observations of the interplanetary magnetic field between 0.46 and 1 AU by the Mariner 10 spacecraft, NASA-X-692-76-2, January

Behannon, K.W. (1975) Variation of the interplanetary magnetic field with heliocentric distance, GSFC Rep. X-692-75-143, June

Coleman, P.J., Smith, E., Jr., Davis, L., Jones, E.D. (1969) The radial dependence of the interplanetary magnetic field: 1.0-1,5 AU. J. Geophys. Res. 74:2826-2850

Jokipii, J.R. (1975) Fluctuations and the radial variation of the interplanetary magnetic field. Geophys. Res. Lett. 2:473-475

Musmann, G., Neubauer, F.M., Maier, A., Lammers, E. (1975) Das Forstensonden-Magnetfeldexperiment (E2). Raumfahrtforschung 19:232-237

Neugebauer, M. (1975) Large scale and solar-cycle variations of the solar wind. Space Sci. Rev. 17:221-254

Parker, E.N. (1963) Interplanetary dynamical processes. Interscience, New York

Parker, G.D., Jokipii, J.R. (1976) The spiral structure of the interplanetary magnetic field. Geophys. Res. Lett. 3:561-564

Rosenberg, R.L., Coleman, P.J., Jr. (1973) The radial dependence of the interplanetary magnetic field: 1.0-0.7 AU, Institute of Geophysical and Planetary Physics No. 1196-26, Univ. of California, Los Angeles

Smith, E.J. (1974) Radial gradients in the interplanetary magnetic field between 1.0 and 4.3 AU: Pioneer 10, Jet Propulsion Lab., Pasadena CA, USA

Villante, U., Mariani, F. (1975) On the radial variation of the interplanetary magnetic field: Pioneer 6. Geophys. Res. Lett. 2:73-74