Accession Number : ADA131825

Title :   The Owens Valley Frequency-Agile Interferometer.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA INST OF TECH PASADENA

Personal Author(s) : Hurford,G J

PDF Url : ADA131825

Report Date : Mar 1983

Pagination or Media Count : 24

Abstract : The solar microwave spectrum encodes significant information on plasma parameters, magnetic field strengths and characteristics of accelerated electrons in solar flares and active regions. The solar interferometer of the Owens Valley Radio Observatory has recently been converted to frequency-agile operation to effectively become a high resolution, interferometric spectrometer. The interferometer uses two moveable, 27 m diameter parabolic antennas equipped with frequency-agile receivers. These receivers are capable of switching their observing frequency in less than 50 ms between any of 86 different frequencies in the range 1 to 18 GHz. All data are absolutely calibrated with respect to cosmic sources. In 1981, observations with one frequency-agile receiver were conducted and high resolution spectra of many flares were obtained. One unexpected aspect of such spectra were narrow-band bursts, which featured sharp high- and low-frequency cutoffs and a relatively narrow bandwidth.

Descriptors :   *MICROWAVE INTERFEROMETRY, *FREQUENCY AGILITY, *INTERFEROMETERS, SOLAR ATMOSPHERE, SOLAR SPECTRUM, MICROWAVE RECEIVERS, SOLAR FLARES, CALIBRATION, DATA PROCESSING, HIGH RESOLUTION, NARROWBAND

Subject Categories : Astrophysics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE