Results 11 to 20 of about 630 (149)
CALIBRATION OF SIBERIAN RADIOHELIOGRAPH ANTENNA GAINS USING REDUNDANCY
Solar-Terrestrial Physics, 2021 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 ...
M.V. Globa, S.V. Lesovoi
doaj +4 more sources
3-CM RADIOHELIOGRAPHA 3-cm radioheliograph has been completed in July 1969 and ever since test observations have been made. The T-shaped antenna is composed of 32+16 dishes, and the resolution is 1.'6 and 2.'4 before and after smoothing in the direction near the zenith. The 'shutter speed' is about 20 minutes, and the map of circular polarization can be obtained as well ...
KOBAYASHI, Shoji +13 more
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8-CM RADIOHELIOGRAPHAn 8-cm radioheliograph which has been under construction since 1972 is almost completed. It has a maximum resolving power of 1.5 .arc min. and can be operated in various operational modes combined with the existing high-resolution compound interferometer. The minimum time necessary for taking a map is 40 seconds. A two-dimensional mapping will be used
KOBAYASHI, Shoji +13 more
openaire +2 more sources
Simulating Siberian Radioheliograph response to the quiet Sun [PDF]
Solar-Terrestrial Physics, 2018 The Siberian Radioheliograph (SRH) correlation plot is the time dependence of the sum of absolute values of complex correlations over all baselines. These plots are built for each operating frequency of SRH.
Lesovoi S.V., Kobets V.S.
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Observations of coronal holes with the Siberian Radioheliograph
Solar-Terrestrial PhysicsMulti-wavelength observations of a coronal hole (CH) with two-dimensional spatial resolution have been made for the first time in the frequency range from 2.8 to 12 GHz.
Globa M. V. +2 more
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A 96-antenna radioheliograph [PDF]
Research in Astronomy and Astrophysics, 2014 Here we briefly present some design approaches for a multifrequency 96-antenna radioheliograph. The array antenna configuration, transmission lines and digital receivers are the main focus of this work. The radioheliograph is a T-shaped centrally-condensed radiointerferometer operating at the frequency range 4-8~GHz. The justification for the choice of
Lesovoi, S. V. +3 more
openaire +2 more sources
The Multifrequency Siberian Radioheliograph [PDF]
Solar Physics, 2012 The 10-antenna prototype of the multifrequency Siberian radioheliograph is described. The prototype consists of four parts: antennas with broadband front-ends, analog back-ends, digital receivers and a correlator. The prototype antennas are mounted on the outermost stations of the Siberian Solar Radio Telescope (SSRT) array.
Lesovoi, S. V. +3 more
openaire +2 more sources
Solar-Terrestrial Physics, 2021 We analyze the presence of a microwave neutral-line-associated source (NLS) in a super-active region NOAA 12673, which produced a number of geo-effective events in September 2017.
A.V. Kudriavtseva +3 more
doaj +1 more source
Over seven decades of solar microwave data obtained with Toyokawa and Nobeyama Radio Polarimeters
Geoscience Data Journal, Volume 10, Issue 1, Page 114-129, January 2023., 2023 Upper left: Toyokawa Radio Polarimeter (ToRP: Behnde) and 8‐element solar grating array (Front). Upper Right: Nobeyama Radio Polarimeter (NoRP). Lower: Long‐term variation of microwave fluxes (colors) and sunspot (black) from the 1950s to 2021. Abstract Monitoring observations of solar microwave fluxes and their polarization began in Japan during the ...
Masumi Shimojo, Kazumasa Iwai
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Earth and Space Science, Volume 7, Issue 3, March 2020., 2020 Abstract Solar prominences are structures of importance because of their role in polar field reversal. We study the long‐term variation of the time latitude distribution of solar prominences in this article. To accomplish this, we primarily used the digitized disc‐blocked Ca II K spectroheliograms as recorded from Kodaikanal Solar Observatory for the ...
Subhamoy Chatterjee +4 more
wiley +1 more source