Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..401j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 1, p. 401-409.
Astronomy and Astrophysics
Astrophysics
18
Earth Atmosphere, Ionospheric Disturbances, Radio Telescopes, Very Large Array (Vla), Radio Interferometers, Scintillation, Spectrum Analysis
Scientific paper
The very large array telescope was used to study ionospheric waves with disturbance wavelengths greater than 20 km. This paper examines analysis procedures appropriate to long baseline interferometers as well as the basis for dynamic phase compensation using continual wave-parameter fits. An analysis logarithm which fits spatially monochromatic plane waves for each angular frequency in the visible-phase data was developed. The simple plane-wave model accounts for most of the baseline phase structure over the band 0.00025 - 0.032 Hz. The close fit of the phase data to plane-wave model suggests the possibility of dynamically compensating transient ionospheric visibility phases prior to forming images using auxilliary data from a sparse subarray.
Erickson William C.
Jacobson Abram R.
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