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Comparisons with soft x ray images and spectra and with hard x ray data specify the magnetic field strength and emission mechanism of flaring coronal loops. In some cases preburst heating and magnetic changes are observed from loops tens of minutes prior to the impulsive phase.

The unprecedent spatial resolution of the VLA at 20 cm wavelength showed that the precursor, impulsive, and post-flare components of solar bursts originate in nearby, but separate loops or systems of loops. Detailed comparison of simultaneous Solar Maximum Mission (SMM) Satellite and VLA data indicate that physical parameters such as electron temperature, electron density, and magnetic field strength can be obtained, but that some coronal loops remain invisible in either spectral domain. Thermal cyclotron line emission was detected at the apex of coronal loops where the magnetic field strength is relatively constant. Very Large Array observations at 20 cm wavelength can detect the hot coronal plasma previously observed at soft x ray wavelengths. Simultaneous Solar Maximum Mission (SMM) and Very Large Array ( VLA) observations of solar active regions They include VLA observations of compact, transient sources in the transition region simultaneous SMM/ VLA observations of the coronal loops in one active region and the evolution of another one and sampling of the coronal plasma using thermal cyclotron lines (magnetic field - VLA) and soft X ray spectral lines (electron density and electron temperaure-SMM)

Several papers on the subject are in progress. These data are compared with simultaneous SMM observations. The multiple wavelength VLA observations were used to determine the temperature and magnetic structure at different heights within coronal loops. A total of two weeks of simultaneous SMM/ VLA data were obtained. Combined results enhance the scientific return for beyond that expeted from using either SMM or VLA alone. Simultaneous observations of solar active regions with the Solar Maximum Mission (SMM) Satellite and the Very Large Array ( VLA) have been obtained and analyzed. International Nuclear Information System (INIS) Semiannual Progress Report, 1 February 1985-30 January 1986 Simultaneous Solar Maximum Mission and Very Large Array ( VLA) observations of solar active regions.