Observation of Solar Chromosphere: Development of High Definition Hα Solar Telescope and its Observation

Physics

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Chromosphere, Solar Activity, Solar Optical Telescope, H Alpha Line, Space Observations (From Earth), Solar Cosmic Rays, Solar Flares, Solar Radio Bursts, Solar Prominences, World Wide Web, Digital Data, Spectroscopic Analysis, Real Time Operation, Weather Forecasting, Data Bases

Scientific paper

The high-definition H alpha telescope has been developed for the Space Weather Forecast Project and is in operation at Hiraiso Solar Terrestrial Research Center, CRL. Its advantageous features are: (1) high-resolution digital H alpha images with 2K by 2K CCD; (2) real-time data frame selection with software; (3) spectroscopic observation using the wavelength scanning method with Lyot filter; and (4) automatic control systems for daily observation monitoring. In daily solar terrestrial forecasts at Hiraiso, the data is used for finding active regions, flares, and filament eruptions and foreseeing the activity level of each active region by evaluating the chromospheric feature and its change. Several fundamental research topics are also ongoing with the H alpha data. We have constructed a WWW image database consisting of images of daily active regions and some flares and movies showing solar active phenomena. The telescope will be one of the main facilities for the operational space weather forecast of the next solar maximum at the beginning of the 21st century.

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