Nobeyama Radioheliograph (NoRH) is a radio telescope
dedicated to observe the Sun.
"Helio" means the Sun, "graph" means an imaging telescope.
It consists of 84 parabolic antennas with 80 cm diameter,
sitting on lines of 490 m long
in the east/west and of 220 m long in the north/south.
Its construction took 2 years and cost 1.8 billion yen.
The first observation was in April, 1992 and the daily 8-hours observation
has been done since June, 1992.
17GHz (Right and left circular polarization), 34GHz (only intensity)
Field of view
Solar full disk
10 arcsec (17GHz), 5 arcsec (34GHz)
0.1 sec (Event), 1 sec (Steady)
As the NoRH is a radio interferometer, original data are sets of
correlation values of all the combination of antennas. They
correspond to the spatial Fourier components of the brightness
distribution of the solar disk. In most cases, it is necessary to
synthesize images from the original raw data.
To maximize the data use, we prepare images, indices and other
related materials routinely and put them on our Web page.
This Web page is to help the scientists in the world to look for
interesting phenomena detected by the NoRH and to start the
actual analysis using the original data set. Software for image
synthesis and analyses are prepared. Image synthesis and
analyses can be done remotely through the Internet.
This data and images can also be used for science education. We are
glad if our images are of any help in education at schools,
universities, and public.
Nakajima et al. "The Nobeyama Radioheliograph",
Proc. of the IEEE, 82, 705, (1994)
Takano et al., "An Upgrade of Nobeyama Radioheliograph to a Dual-Frequency
(17 and 34 GHz) System" in
"Coronal Physics from Radio and Space Observations,
Lect. Notes Phys.", (Berlin: Springer-Verlag) 183 (1997)
"The Nobeyama Radioheliograph
-- A Collection of Papers on Initial Results and Instrumentation",
NRO Report 357 (1994)
"New Look at the Sun with Emphasis on Advanced Observations of
Coronal Dynamics and Flares", Proc. of Kofu Symp.
NRO Report 360 (1994)