Results 81 to 90 of about 133 (107)

The Nobeyama radioheliograph

Proceedings of the IEEE, 1994
A new 17-GHz radio interferometer dedicated for solar observations was constructed in two years at Nobeyama, Nagano. It consists of eighty-four 80-cm-diameter antennas arranged in a tee-shaped array extending 490 m in east-west and 220 m in north-south directions.
Hiroshi Nakajima, Masanori Nishio, Shinzo Enome, Kiyoto Shibasaki, Toshiaki Takano, Yoichiro Hanaoka, Chikayoshi Torii, Hideaki Sekiguchi, Takeshi Bushimata, Susumu Kawashima, Noriyuki Shinohara, Yoshihisa Irimajiri, Hideki Koshiishi, Takeo Kosugi, Yasuhiko Shiomi, Masaki Sawa, Keizo Ka   +16 more
openaire   +1 more source

The Gauribidanur Radioheliograph

Solar Physics, 1998
A new radio heliograph for obtaining two-dimensional images of the solar corona sequentially at many frequencies in the range 40–150 MHz has been built by the Indian Institute of Astrophysics at the Gauribidanur Radio Observatory (lat. 13°36′12″ N and long. 77°27′07″ E) about 100 km north of Bangalore, India. This paper describes various aspects of the
R. Ramesh, K. R. Subramanian, M. S. SundaraRajan, Ch. V. Sastry   +3 more
openaire   +1 more source

Three-frequency operation of the Culgoora radioheliograph

Proceedings of the IEEE, 1973
K.V. Sheridan, N.R. Labrum, W.J. Payten
exaly   +2 more sources

Plans for a new radioheliograph in Belgium

Solar Physics, 1992
The existence of “spikes” with very short time scales (1 to 10 ms) in the decimetric radio spectrum emphasizes the necessity of building radio instruments with very high time resolution. Therefore, we are planning to build a multi-frequency decimetric radioheliograph at the radioastronomical station of the Observatoire Royal de Belgique (Humain ...
Pierre Cugnon, Roger Gonze, Fr�deric Clette   +2 more
openaire   +1 more source

The nançay radioheliograph

2008
The Nancay Radioheliograph has been upgraded in order to provide high time resolution 2D images of the soler corona. This is due to its new digital correlator (Stokes I and V, 576 channels). Calibration has also been improved. The multifrequency operation remains almost unchanged. It allows simultaneous observations of up to 10 frequencies in the range
Alain Kerdraon, Jean-Marc Delouis
openaire   +1 more source

Use of the Culgoora Radioheliograph for the Generation of Diffraction Patterns

Applied Optics, 1971
A series of diffraction patterns produced with the electronic imaging system of the Culgoora radioheliograph is presented. These patterns serve both to illustrate the quality of this type of imaging system and to demonstrate the advantage, in special circumstances, of constructing a radio-frequency simulation of an optical imaging device.
K V, Sheridan, D J, McLean
openaire   +2 more sources

Intensity Calibration for the Mingantu Spectral Radioheliograph Images

Chinese Astronomy and Astrophysics
Zhou Zhi-chao, Chen Lin-jie, Yan Yi-hua, Wang Wei   +3 more
exaly   +2 more sources

A proposed millimeter radioheliograph

Proceedings of the IEEE, 1973
A radio telescope capable of two-dimensional mapping of the sun at a millimeter wavelength with resolution of a few seconds of arc would add greatly to our knowledge of the sun and solar flares. A design which promises to make such an instrument possible is being studied at present.
openaire   +1 more source

The Nancay multifrequency radioheliograph: New observations

Advances in Space Research, 1988
Abstract The Nancay radioheliograph provides images of the sun on a north-south baseline at up to five frequencies between 150 and 450 MHz with time resolution up to 0.1 s. East-west images are also obtained at 164 MHz with a time resolution up to 0.02 s. This paper briefly presents the performances of the instrument and the observing modes.
C. Mercier, K.-L. Klein, G. Trottet
openaire   +1 more source

A Proposed Correlator Backend for the Culgoora Radioheliograph

Publications of the Astronomical Society of Australia, 1979
The Culgoora radioheliograph was designed in the early 1960s and commissioned in 1967. Since then there have been dramatic increases in the speed and versatility of digital integrated-circuit devices, and also a marked fall in their cost. It is now possible to replace the original signal processing electronics with equipment, based on modern digital ...
D. J. McLean, M. Beard, A. Bos
openaire   +1 more source