Accession Number : AD0760124

Title :   A Study to Extend the Knowledge of Solar Active Regions and Associated Phenomena.

Descriptive Note : Final rept. 1 May-31 Dec 72,

Corporate Author : HALE OBSERVATORIES PASADENA CALIF

Personal Author(s) : Howard,Robert F.

Report Date : 30 JAN 1973

Pagination or Media Count : 9

Abstract : More than 275 full-disk scans of the solar surface were made at the Mount Wilson Observatory in several spectrum lines. Analysis of the resulting velocity signals indicates that although the equatorial velocities measured with the FeI and FeII lines are identical, the high latitude rotations differ. The ionized line shows a more rapid falloff of angular velocity with latitude than does the neutral line. This is an exciting and unexpected result that will be studied in more detail. The limb redshift parameters from the two lines differ by nearly a factor two, with the ionized line having the larger value. Variations with time in the equatorial velocities measured with the two lines were nearly the same. The average equatorial velocities over the observing period were significantly faster than for a comparable period five years ago. This may be associated with a lower level of solar activity. (Author)

Descriptors :   (*SOLAR ATMOSPHERE, FLOW FIELDS), SOLAR SPECTRUM, ROTATION, VELOCITY

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE