Checks if none of the coordinates in the
GenericMapare on the solar disk.
The check is performed by calculating the angle of every pixel from the center of the Sun. If they are all greater than the angular radius of the Sun, then the function returns
True. Otherwise, the function returns
GenericMap) – A map in helioprojective Cartesian coordinates.
For coronagraph images such as those from LASCO C2 and C3 the full disk is within the field of view of the instrument, but the solar disk itself is not imaged. For such images this function will return