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Frequently Asked Questions
Archive Data
Instruments
Archive Data
- Where do I get BEFS archival data?
Both BEFS I and II data can be obtained by searching the on-line catalog at click here to search the BEFS archive. Or by ftp access (please see the obtaining BEFS data page.
Instruments
- What are the differences between BEFS I and BEFS II?
For BEFS II, two of the four diffraction grating were overcoated with silicon carbide and the instrument electronics were modified for improved imaging at high count rates. Three apertures were added for spectroscopy: 1) with an on-axis 26" hole, 2) a second clear hole displaced by 2.4' and 1.4 times larger for diffuse sky glow or serendipitous spectroscopy, and 3) a large 2' aperture with a tin filter opaque to FUV radiation, but transparent in the EUV and used primarily for observations of epsilon CMa.
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