A magnetic cloud and a coronal mass ejection

Authors:
  • LBL. F. Burlaga
    L. F. Burlaga
  • LKL. Klein
    L. Klein
  • NSN. R. Sheeley
    N. R. Sheeley
  • DMD. J. Michels
    D. J. Michels
  • MKM. J. Koomen
    M. J. Koomen
  • RSR. Schwenn
    R. Schwenn
  • HRH. Rosenbauer
    H. Rosenbauer
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Abstract
An interplanetary magnetic cloud observed by the Helios 1 spacecraft was found to be associated with a coronal mass ejection observed by the NRL Solwind coronagraph on the spacecraft P78‐1. The magnetic cloud was observed on June 20, 1980 when Helios 1 was at 0.54 AU and nearly 90° west of the earth‐sun line. This was associated with a large loop‐like coronal mass ejection observed over the west limb on June 18, 1980, moving toward Helios 1. The speed of the front of the event at Helios 1 was (470 ± 10) km/s, which is close to the mean transit speed (∽ 500 km/s). The magnetic cloud was similar to others described in the literature: The magnetic field strength was higher than average; the density was relatively low; the magnetic pressure greatly exceeded the ion thermal pressure; and the magnetic field direction changed through the cloud by rotating parallel to a plane which was highly inclined with respect to the ecliptic.

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