Ionospheric Phase Errors and Corrections at 1 m Wavelength

Details Ionospheric Phase Errors and Corrections at 1 m Wavelength Ionospheric Phase Errors and Corrections at 1 m Wavelength

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8506c&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #85.06; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

High resolution observations at long wavelengths are adversely affected by ionospheric irregularities causing a screen of variable index of refraction. A correction technique developed for VLA observations at 4 m wavelength is shown to be both necessary and beneficial for wide-field, high resolution imaging at 1 m wavelength using the VLA. A time and celestial position dependent refraction is determined from observations of known strong sources and used to correct the derived image. Due to the spatially dependent nature of the ionospheric refraction, application of the corrections must be implemented as part of the imaging and deconvolution process. The National Radio Astronomy Observatory (NRAO) is operated by Associated Universities Inc., under cooperative agreement with the National Science Foundation.

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