National Institute of Information and Communications Technology (NICT) has continued solar radio and optical observations since 1950’s. This site is a data base of NICT solar observation, which includes solar radio dynamic spectra obtained with HiRAS (1996-2016) and YAMAGAWA (2016-present), and H-alpha images observed at Hiraiso Solar observatory (1994-2006).

Solar Radio Observation

Solar Optical Observation

>Solar Radio Observation Data
>Solar Optical Observation Data

Real-time dynamic spectrum of YAMAGAWA solar radio spectrograph

The plot updates every 1 minute with a delay of a few tens of second.


The legacy site of HiRAS


The use of NICT solar observation images for non-commercial purposes and public education and information efforts is encouraged and requires no expressed authorization. It is requested, however, that any such use properly attributes the source of the images or data as:
"Courtesy of National Institute of Information and Communications Technology (NICT)."
For the use of NICT solar observation FITS data and images for scientific purposes, such as a publication of research, it is requested to express an acknowledgement for use of NICT solar observation database and cite the following articles as a reference:
Iwai, K. et al. OCTAD-S: digital fast Fourier transform spectrometers by FPGA, Earth, Planets and Space, Vol.69, Article id.95, 2017 for YAMAGAWA data.
Kondo, T. et al. THE HIRAISO RADIO SPECTROGRAPH (HiRAS) FOR MONITORING SOLAR DADIO BURSTS, Journal of the communications research laboratory, Vol.42, pp.111, 1995 for HiRAS data.
Akioka, M. H-alpha Solar Telescope at Hiraiso and Its Initial Observations, Journal of geomagnetism and geoelectricity, Vol48, pp.5, 1996 for optical data.


If you have any questions and comments, please submit your message from "Inquiry Form for Space Environment Information Service".