title: Birefringence effect as a tool for astrophysical plasma study.
abstract: Group delay between two magnetoionic modes is discovered and spectrally confirmed ( deltat(g) proportional, variantf(-3)) for the first time for quasiperiodic narrow band millisecond solar radio pulsations. Analysis of cross delays and autodelays proves that both X and O modes originate at the same source, so the radiation is weakly polarized originally. This finding allows one to specify the emission mechanism of the pulsations to be a nonlinear plasma mechanism operating at the second harmonics. Physical parameters of the solar corona are determined by the use of the theory of the nonlinear plasma mechanism; they agree well with independent observations of solar millisecond pulsations.
authors.affiliation: Purple Mountain Observatory, National Astronomical Observatories, Nanjing 210008, People's Republic of China.
authors.forename: G D
authors.initials: GD
authors.lastname: Fleishman
authors.forename: Q J
authors.initials: QJ
authors.lastname: Fu
authors.forename: M
authors.initials: M
authors.lastname: Wang
authors.forename: G-L
authors.initials: GL
authors.lastname: Huang
authors.forename: V F
authors.initials: VF
authors.lastname: Melnikov