Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9611307j&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, July 1, 1991, p. 11,307-11,318.
Physics
18
Helios Satellites, Interplanetary Medium, Solar Rotation, Solar Wind, Corotation, Photometers, Stellar Mass Ejection, Zodiacal Light
Scientific paper
The Helios spacecraft zodiacal light photometers have observed coronal mass ejections as they move outward in the inteplanetary medium. Images formed from the Helios spacecraft photometer data show extended structures moving from east to west over periods of many days. Sample structures observed are shown to have positions relative to solar elongation consistent with the curve of the Archimedian spiral. The positions of over 40 of these structures ranged from low latitude to as high as 50 deg, and their speeds have a mean value of 301 + or - 47 km/s. Modeling indicates that these structures can have densities many times above the ambient and that the density in excess of an 1/r-squared ambient can differ greatly along their curved extents at any given time. Most of the structures measured in this sample either remain at about the same density or decrease in density with height above the sun, indicating that they are remnants of features formed near the solar surface.
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