The instantaneous angular distribution of synchrotron radiation is investigated. The radiation space is divided into two parts. The first one is the interior of a cone with the central axis oriented along the charge velocity and the angular span being 2α0, and the second one is the complement of cone 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 vanishes.
Particle physics at the year of 150th anniversary of the Mendeleev’s periodic table of chemical elements : proceedings of the Nineteenth Lomonosov Conference on Elementary Particle Physics, Moscow, Russia, 22-28 August 2019. New Jersey [a. o.], 2021. P. 532-535