  The instantaneous angular distribution of synchrotron radiation is
investigated. The radiation space is divided into two parts. The first part of
the space is the interior of a cone with the apex located at the point of a
radiating charge, the angular span being $2\alpha_0$ and the central axis
oriented along the instantaneous velocity of the charge. The second part of the
space is the complement of the first part in the entire space. It is shown that
the radiation in the ultrarelativistic limit is entirely contained in the first
part of the space, and the radiation in the second part (with a non-zero
$\alpha_0$) vanishes.
