CALIBRATION OF SIBERIAN RADIOHELIOGRAPH ANTENNA GAINS USING REDUNDANCY
Journal Title: Solar-Terrestrial Physics - Year 2021, Vol 7, Issue 4
Abstract
The paper describes application of standard gain calibration using redundancy for a 48-antenna prototype of Siberian Radioheliograph. Traditionally, for calibration, the visibilities were measured only between adjacent antennas since they have the highest signal-to-noise ratio and are sufficient for phase calibration. We have shown that this limited set of visibilities did not allow using the antenna array redundancy potential and obtaining images with a high dynamic range on a permanent basis. Images without amplitude calibration contain many artifacts and require special care when analyzed. The inclusion of visibility measurement between antennas with a double step made it possible to significantly increase the accuracy of solving the system of equations for amplitudes. Images constructed using both phase and amplitude calibrations do not have visible artifacts and are more reliable.
Authors and Affiliations
Globa M. V. , Lesovoi S. V.
Keywords
Related Articles
- EP ID EP700044
- DOI 10.12737/stp-74202111
- Views 90
- Downloads 0
PROBLEMS OF THE PC1 MAGNETOSPHERIC WAVE THEORY. A REVIEW
The Pc1 ultralow-frequency electromagnetic waves (frequency range 0.2–5 Hz), also known as pearl necklace, are a unique phenomenon in near-Earth space physics. Many properties of pearls remain a mystery, despite the rese...
SPATIAL STRUCTURE OF AZIMUTHALLY SMALL-SCALE MHD WAVES IN ONE-DIMENSIONALLY INHOMOGENEOUS FINITE PRESSURE PLASMA WITH CURVED FIELD LINES
We have studied propagation of hydromagnetic (MHD) waves in one-dimensionally inhomogeneous finite pressure plasma with curved field lines. Magnetic surfaces are considered to be concentric cylinders, where the cylinder’...
INVERSION OF BACKSCATTER IONOGRAMS INTO QUASIPARABOLIC IONOSPHERIC LAYER PARAMETERS
We present an inversion scheme of the backscatter signal leading edge into parameters of the quasi-parabolic electron density profile, which is based on the comparison of experimental and calculated minimum delays of sca...
WAVE ACTIVITY OF THE MESOSPHERE IN THE PLANETARY WAVE RANGE ACCORDING TO OH (3-1) EMISSION OBSERVATIONS AT MAIMAGA AND TIKSI STATIONS FOR 2015–2020
The article compares the interannual variability of the atmosphere at the OH glow height, which can be associated with planetary wave propagation, at stations spaced in latitude. As a characteristic reflecting planetary...
LONG-TERM TREND OF THE IONOSPHERIC E-LAYER RESPONSE TO SOLAR FLARES
Using data from ground-based vertical sounding of the ionosphere (VS) at the station Moscow and five Japanese stations for the period from 1969 to 2015, we have examined the long-term response of the E layer to solar X-r...