Data ARchives and Transmission System (DARTS) is a multi-disciplinary space science data archive for, e.g., astrophysics, solar physics, solar-terrestrial physics, lunar and planetary science, and microgravity science. Please read "About DARTS".

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2018-2-20 10:00 -- 13:00 (JST)

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Ginga (ASTRO-C) All Sky Monitor (ASM) Data Released

ISAS has been restoring the past satellite data launched by ISAS and stored at Japanese universities. Ginga (ASTRO-C) was launched in 1987, and equipped with the main instrument, Large Area Counter (LAC) and also All Sky Monitor (ASM). The LAC observed specific celestial objects in detail with a small field of view. On the other hand, ASM monitored various objects all over the sky by periodically sweeping the sky with a long and thin field of view. From the end of February 1987, Ginga started daily ASM monitoring for about 20 minutes, while the LAC observation was interrupted. Until the end of operation in autumn 1991, ASM obtained 4.5-year X-ray intensity histories of more than 100 objects. The right upper figure shows the intensity history of the black hole candidate GX 339-4, indicating that the object was sometimes extremely bright and sometimes very faint during the mission period. The right lower figure shows the intensity history of an X-ray nova appeared in January 1991, which was named GS1124-683, meaning that it was discovered by Ginga Satellite at RA=11h24m, Dec=−68.3 deg. The ASM raw data had been stored at Osaka and Rikkyo universities for a long time. The data were converted into the standard FITS format and released from DARTS, through collaboration between Rikkyo University and ISAS. (Jan 2018)

Akatsuki (PLANET-C, VCO) Data Released

Akatsuki was launched in May, 2010, and successfully put into the orbit around Venus in December, 2015. Akatsuki has been investigating the super-rotation of the Venus atmosphere, by recording images on the day-side and the night-side in several different wavelengths (see the photo). Data acquired by Akatsuki have been progressively released. The 1st release was opened to public in July, 2017, and the 2nd release was opened in December, 2017. We will continuously release the data taken in a six-month period with 6 month intervals. In addition, we are planning to release higher level (i.e., more processed) products such as longitude-latitude mapped data and/or cloud motion vectors in future. (Jan 2018)

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Last Modified: 29 January 2018