A Study of Large-Scale Solar Magnetic and Velocity Fields.
Abstract
The large-scale magnetic and velocity fields on the solar surface have been observed using the magnetograph of the Stanford Solar Observatory. Very low spatial resolution was used: the aperture was 3' on a side, roughly one-tenth of the solar diameter. Full-disk maps of the magnetic field were made every day, weather permitting, from May 1976 to June 1977 using the spectral line FeI lambda 5250A. The magnetograms have been used to derive the average poloidal and toroidal components of the photospheric magnetic field near solar minimum as a function of latitude. The average magnetic field signal, as a function of longitude measured from central meridian for a given latitude, is found to behave as the projection of a vector. By observing various projections of the average field vector it is possible to derive two components of the field, namely the line of sight component of the field at central meridian, defined to be the poloidal field and the line of sight component of the field at the east limb, defined to be the toroidal field.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1977
- Accession Number
- ADA054058
Entities
People
- Thomas Lee Duvall Jr
Organizations
- Stanford University