Abstract:
Propagation of ultra-high energy photons in the solar magnetosphere gives rise to
cascades comprising thousands of photons. We study the cascade development using Monte
Carlo simulations and find that the photons in the cascades are spatially extended over
millions of kilometers on the plane distant from the Sun by 1 AU. We estimate the chance of
detection considering upper limits from current cosmic rays observatories in order to provide
JCAP03(2022)038
an optimistic estimate rate of 0.002 events per year from a chosen ring-shaped region around
the Sun. We compare results from simulations which use two models of the solar magnetic
field, and show that although signatures of such cascades are different for the models used,
for practical detection purpose in the ground-based detectors, they are similar.
