Abstract
Helios-1 and 2 spacecraft allowed a detailed investigation of the radial dependence of the interplanetary magnetic field components between 0.3 and 1 AU. The behaviour of the radial component B ris in a very good agreement with Parker's model (B r∼ r -2) and the azimuthal component B φalso shows a radial dependence which is close to theoretical predictions (B φ∼ r -1). Experimental results for the normal component B θand for the field magnitude B are consistent with those from previous investigations. The relative amplitude of the directional fluctuations with periods less than 12 hr is essentially independent of heliocentric distance, while their power decreases approximately as r −3 without any appreciable difference between higher and lower velocity regimes.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Bavassano, B.: 1976, Internal Note Laboratorio Plasma nello Spazio, 76-18.
Behannon, K. W.: 1978, Rev. Geophys. Space Phys. 16, 125.
Belcher, J. W. and Burchsted, R.: 1974, J. Geophys. Res. 76, 3534.
Hollweg, J. V.: 1975, Rev. Geophys. Space Phys. 13, 263.
Mariani, F., Ness, N. F., Burlaga, L. F., Bavassano, B., and Villante, U.: 1978, J. Geophys. Res. 83, 5161.
Scearce, C., Cantarano, S., Ness, N. F., Mariani, F., Terenzi, R., and Burlaga, L. F.: 1975, Internal Report NASA/GSFC X-692-75-112.
Villante, U. and Mariani, F.: 1977, Internal Note Laboratorio Plasma nello Spazio, 77–23.
Whang, Y. C.: 1973, J. Geophys. Res. 78, 7221.
Author information
Authors and Affiliations
Additional information
Also at Laboratorio Plasma nello Spazio, CNR, Frascati.
Rights and permissions
About this article
Cite this article
Mariani, F., Villante, U., Bruno, R. et al. An extended investigation of Helios 1 and 2 observations: The interplanetary magnetic field between 0.3 and 1 AU. Sol Phys 63, 411–421 (1979). https://doi.org/10.1007/BF00174545
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00174545