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Knowledgebase : General ALMA Queries > The Sun
There is no difference in the feathering process between the Solar and other observations, except for the case that the field of view is very near the solar limb (< the diameter of the primary beam). For the limb observations, you might need to apply the ...
Please note first the limitations of ALMA observations: * The longest duration of one scheduling block (SB) is 2 hours. * Every SB includes a calibration session before starting scientific observation. The duration of the session is 25~30 minutes. ...
When you request an observation with single-pointing, the time cadence of images is limited by the integration time of the 64-bits correlator. Since the integration time is set to 1 second, the highest time cadence is 1 second. When you request a "mosaic"...
For interferometric observations, we have to observe a quasar as a phase calibrator every ~10 minutes for single-pointing, ~5 minuets for MOSAIC observations at Bands 3 and 6. Therefore, the duration of a continuous solar observation is approximately 10 o...
An ephemeris file gives the RA and DEC as a function of time. All positions should be in ICRS (J2000) The ephemeris file should cover the entire potential time span of the project (up to the entire Cycle), and may have up to ~90,000 entries.  The PI sho...