Coronal temperature, density, and magnetic field maps of a solar active region using the Owens Valley Solar Array

Details Coronal temperature, density, and magnetic field maps of a solar active region using the Owens Valley Solar Array Coronal temperature, density, and magnetic field maps of a solar active region using the Owens Valley Solar Array

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...420..903g&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 420, no. 2, p. 903-912

Astronomy and Astrophysics

Astrophysics

53

Mapping, Solar Activity, Solar Arrays, Solar Corona, Solar Magnetic Field, Brightness Temperature, Electron Energy, Emission Spectra, Line Spectra, Solar Wind

Scientific paper

We present the first results of solar active region observations with the recently completed five-element Owens Valley Solar Array. On 1991 October 24, maps of Active Region AR 6891 were obtained at 22 frequencies from 1.2-7.0 GHz to provide brightness temperature spectra at each point. This is the first time that both high spatial and frequency-resolution brightness temperature spectra have been available over such a broad radio-frequency range. We find that over most of the region the spectra fall into one of the two well-defined categories: thermal free-free or thermal gyroresonance. In these cases, we use the spectra to deduce the spatial variation of physical parameters-electron temperature, column emission measure (intergral n2e dl), and the coronal magnetic field strength-in and around the active region. Over a limited area of the region, the spectra resemble neither of the simple types, and alternative interpretations are required. The possibilties include the presence of fine structure that is unresolved at low frequencies; the presence of a small number of nonthermal electrons; or the presence of overlying, cooler 106 K material which at low frequencies absorbs the hot (3 x 106 K) thermal emission generated below.

Affiliated with

Also associated with

No associations

Rating

Coronal temperature, density, and magnetic field maps of a solar active region using the Owens Valley Solar Array does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Coronal temperature, density, and magnetic field maps of a solar active region using the Owens Valley Solar Array, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coronal temperature, density, and magnetic field maps of a solar active region using the Owens Valley Solar Array will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-865865