heliophysics

noun

Etymology: Etymology tree Proto-Indo-European *sóh₂wl̥ Proto-Indo-European *sh₂wél(i)yos Proto-Hellenic *hāwélios Ancient Greek ἥλῐος (hḗlĭos) English helio- English physics English heliophysics From helio- + physics.

1. The physics of the Sun and its interactions with objects within the heliosphere