Latitude dependence of solar wind velocity observed at not less than 1 AU

Details Latitude dependence of solar wind velocity observed at not less than 1 AU Latitude dependence of solar wind velocity observed at not less than 1 AU

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86..165m&link_type=abstract

Journal of Geophysical Research, vol. 86, Jan. 1, 1981, p. 165-179.

Astronomy and Astrophysics

Astronomy

21

Latitude Measurement, Satellite Observation, Solar Wind Velocity, Spaceborne Astronomy, Velocity Measurement, Electric Corona, H Alpha Line, Imp, Interplanetary Space, Pioneer Space Probes, Plasma Diagnostics, Radial Velocity, Spatial Distribution, X Ray Spectra

Scientific paper

The large-scale solar wind velocity structure in the outer heliosphere has been systematically analyzed for Carrington rotations 1587-1541 (March 1972 to April 1976). Spacecraft data were taken from Imp 7/8 at earth, Pioneer 6, 8, and 9 near 1 AU, and Pioneer 10 and 11 between 1.6 and 5 AU. Using the constant radial velocity solar wind approximation to map all of the velocity data to its high coronal emission heliolongitude, the velocity structure observed at different spacecraft was examined for latitudinal dependence and compared with coronal structure in soft X-rays and H-alpha absorption features. The constant radial velocity approximation usually remains self-consistent in decreasing or constant velocity solar wind out to 5 AU, enabling us to separate radial from latitudinal propagation effects. Several examples of sharp nonmeridional stream boundaries in interplanetary space (about 5 deg latitude in width), often directly associated with features in coronal X-rays and H-alpha were found.

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