This series of delay-doppler radar images of the asteroid 4769 Castalia (also known as 1989 PB) were taken at approximately 2 minute intervals on 1989 August 22 at the Arecibo Observatory. ... These images have been stretched to look decent on a browser, rather than for accuracy. ... Thus these images have a frequency resolution of 0.24 Hz (~40 m), and a frequency sampling of 0.12 Hz, but the signal to noise ratio should be 2 times worse, as only 6 looks can be summed. ...

ERS -1,2 SAR . ... SIR-C/X SAR . ... European Remote Sensing Satellite (ERS-1) was launched on 17 July 1991, and the follow mission ERS-2 (with the same sensors and an Ozone monitoring instrument added) was launched on 21 April 1995. ... The Spaceborne Imaging Radar-C/X-band Synthetic Radar (SIR-C/X-SAR), carried in the cargo bay of the Space Shuttle Endeavour in April and October of 1994, simultaneously recorded SAR data at three wavelengths (L-, C-, and X-bands; 23.5, 5.8, and 3.1 cm, respectively). ...

Command execution times have one second resolution . ... By convention, does not execute any commands which reconfigure SI hardware . Can shut off entire processor, cannot shut off by SI . ... Common Pool Command sequences (RTCSs) are routinely loaded from the ground . Some Common pool sequences are used for one-time execution (e.g. for a single exposure) . Some Common pool sequences are permanently on-board . ... Previous slide . Next slide . Back to first slide . ...

Solar High Resolution Studies . ... Solar Group . ... High Resolution Studies . Small Scale Activity . ... High resolution observations at different heights in the solar atmosphere have emphasized that there is no such thing as a "quiet" Sun (e.g. Schrijver et al., ... This, and the temporal coincidence of other signatures, supports the idea that microflares are indeed just miniature flares, but that one needs a very high resolution in order to observe them (Cauzzi et al., 2003, in preparation) . ...

... In combining the data, it is assumed that the low resolution image better represents the short spacing data, whereas the high resolution best represents the fine structure. ... Key: out The output image. ... Key: factor The flux calibration factor. ... In practise, the calibration may not be perfect, and an extra calibration factor will be required to align the flux scales. "factor" gives the factor to scale the low resolution image to put it on the same flux scale as the high resolution image. ...

... 2005 October 5 . Annular Solar Eclipse at High Resolution . ... The event was not a total eclipse of the Sun for any Earth-bound sky enthusiast but rather, at best, an annular eclipse , where the Moon blocked most of the Sun. ... Those who witnessed the solar eclipse from a narrow path through Portugal , Spain and Africa , however, were lucky enough to see the coveted Ring of Fire , a dark Moon completely surrounded by the brilliant light of the distant Sun. ... About APOD | ...