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A frequency-agile interferometer for solar microwave spectroscopy

Hurford, G. J. and Read, R. B. and Zirin, H. (1984) A frequency-agile interferometer for solar microwave spectroscopy. Solar Physics, 94 (2). pp. 413-426. ISSN 0038-0938. doi:10.1007/bf00151327.

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A high-resolution microwave spectrometer has been developed by converting the Owens Valley solar interferometer to frequency-agile operation. The system uses 27 m antennas equipped with phase-locked receivers which can change their observing frequency in 25 or 50 ms. Microwave spectra between 1 and 18 GHz are obtained in a few seconds by successive observations at up to 86 discrete frequencies. At each frequency the data are equivalent to the total power from each antenna and the interferometric amplitude and phase. All data are fully calibrated with respect to cosmic sources. The instrument was motivated by the need for better microwave spectral resolution for the study of plasma parameters, non-thermal electrons and coronal magnetic field strengths in solar flares and active regions. Early observations with the system are illustrated by a sequence of flare spectra featuring cases with exceptionally narrow continuum bandwidths.

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Additional Information:© 1984 Kluwer Academic Publishers. Provided by the NASA Astrophysics Data System. Received 10 July 1984. We gratefully acknowledge the contributions of Rich Goeden, David Thompson, and Simon Graetz to the development of this system and appreciate the assistance of the staff at OVRO, most particularly Dan Daugherty and Chuck Spencer. Receiver fabrication was funded by NSF Grants AST-8018200 and ATM-8207281. Support for solar observations at OVRO was provided by the NSF Grants AST-7916149 and AST-8115969. Data analysis was funded by AFGL Contract F19628-82-K-0033 and NSF Grants ATM-8108449 and ATM-8309955. We are grateful to Dr R. E. Vogt for his support and for his assistance in arranging funding for the third receiver.
Funding AgencyGrant Number
Air Force Geophysics LaboratoryF19628-82-K-0033
Subject Keywords:Microwave; Flare; Spectral Resolution; Magnetic Field Strength; Solar Flare
Issue or Number:2
Record Number:CaltechAUTHORS:20200602-140359108
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Official Citation:Hurford, G.J., Read, R.B. & Zirin, H. A frequency-agile interferometer for solar microwave spectroscopy. Sol Phys 94, 413–426 (1984).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103646
Deposited By: Tony Diaz
Deposited On:02 Jun 2020 21:19
Last Modified:16 Nov 2021 18:23

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