Database for High-Cadence Microwave Images of Solar Flares Observed with Nobeyama Radioheliograph


Introduction to NoRH Event-mode Database:

Nobeyama Radioheliograph (NoRH) is a radio interferometer specially designed to observe the Sun at 17 and 34 GHz. The National Astronomical Observatory of Japan (NAOJ) successfully had operated NoRH from June 1992 to March 2015. After that, it was operated by Institute for Space-Earth Environmental Research (ISEE), Nagoya University as a representative of the International Consortium for the Continued Operation of Nobeyama Radioheliograph (ICCON) until March in 2020. During this operating period (~28 years), a lot of solar flares were observed with NoRH. About 900 flares among them were recorded with a high time resolution of 0.1 second (event mode), instead of 1 second (normal mode). This high time-resolution is one of the unique and important characteristics of NoRH, especially for research of particle acceleration in solar flares. The electron acceleration process during a solar flare takes place impulsively in a shorter time-scale compared with thermal processes such as heating/cooling a plasma, plasma motion, and so on. Thus, the capability of this high time-resolution imaging is quite useful to reveal the acceleration/transport/loss processes of high-energy electrons during a solar flare. Recently, we have synthesized 0.1-second cadence images for all the flares observed with the event-mode.

Database Products: (access to data tree)

Description about files contained in this database

YYYYMMDD_HHMMa.mpg: MPEG movie file for 17GHz R+L images
YYYYMMDD_HHMMz.mpg: MPEG movie file for 34GHz R+L images
ipaYYYYMMDD_HHMM.zip: zip file that contains FITS files for 17 GHz R+L image
ipsYYYYMMDD_HHMM.zip: zip file that contains FITS files for 17GHz R-L image
ipzYYYYMMDD_HHMM.zip: zip file that contains FITS files for 34 GHz R+L image

Terms of use

When you publish your work using this database, we strongly encourage to acknowledge the publisher as follows.

Example of acknowledgments

ISEE Database for High-Cadence Microwave Images of Solar Flares Observed with Nobeyama Radioheliograph (doi: to be registered) was developed by the Center for Heliospheric Science, Institute for Space-Earth Environmental Research (ISEE), Nagoya University.

Data DOI

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