Welcome to DARTS/ASCA
Announcement of terminating the FTP data transfer services
Thank you very much for using DARTS.
While we have been supporting FTP and HTTP file transfers at DARTS, we will have to eventually quit FTP survices starting on August 12, 2013, in the course of higher security measures at JAXA. We are very sorry for your inconvinience.
The HTTP file transfer services will be available as before.
- ► URL which is no longer suported :
All the data which have been available there are obtained from the following URL :
- ► Schedule
- (12 Aug 2013) Starting closing FTP services in DARTS
- (31 Aug 2013) Terminate all the FTP serviced in DARTS
ASCA (Advanced Satellite for Cosmology and Astrophysics) is the fourth Japanese X-ray astronomy satellite launched on February 20, 1993 Tanaka et al. 1994. The collaboration between Japanese and US scientists has been carried out in the developments of the X-ray telescopes, the X-ray CCD cameras, and software.
ASCA observed more than 3000 targets before stopping scientific observations on July 14, 2000, when a huge solar flare and a violent magnetic storm occurred. Consequently, atmospheric density around the ASCA orbit and the air-drag disturbance suddenly increased, resulting in a great turbulence in the satellite attitude and a significant electric power shortage.
The observation log is provided by the X-ray astronomy group at ISAS. ISAS continued monitoring ASCA until the satellite reentered the atmosphere on March 2, 2001.