Results 11 to 20 of about 133 (107)
CHROMOSPHERIC SUNSPOTS IN THE MILLIMETER RANGE AS OBSERVED BY THE NOBEYAMA RADIOHELIOGRAPH [PDF]
Astrophysical Journal, 2016 ABSTRACT We investigate the upper chromosphere and the transition region of the sunspot umbra using the radio brightness temperature at 34 GHz (corresponding to 8.8 mm observations) as observed by the Nobeyama Radioheliograph (NoRH). Radio free–free emission in the longer millimeter range is generated around the transition region, and ...
Kazumasa Iwai, K Shibasaki
exaly +3 more sources
Features of correlation curves of the Siberian Radioheliograph
Solar-Terrestrial PhysicsCorrelation curves of the multi-frequency Siberian Radioheliograph (SRH) provide a sensitive indication and demonstrative representation of monitoring the microwave life of the active Sun.
Uralov Arkadiy +3 more
doaj +2 more sources
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
doaj +2 more sources
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
wiley +1 more source
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
Fine Structure of Solar Metric Radio Bursts: ARTEMIS-IV/JLS and NRH Observations
Universe, 2023 Radio bursts provide important diagnostics of energetic phenomena of the Sun. In particular, bursts in decimetric and metric wavelengths probe the physical conditions and the energy release processes in the low corona as well as their association with ...
Costas Alissandrakis +3 more
doaj +1 more source
Burst Locating Capability of the Korean Solar Radio Burst Locator (KSRBL) [PDF]
Journal of Astronomy and Space Sciences, 2015 The Korean Solar Radio Burst Locator (KSRBL) is a solar radio spectrograph observing the broad frequency range from 0.245 to 18 GHz with the capability of locating wideband gyrosynchrotron bursts.
Jung-Eun Hwangbo +6 more
doaj +1 more source