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We have studied variation spectra and cosmic-ray (CR) anisotropy, using the ground-based and satellite observations of the CR intensity on the worldwide network of stations during the ground level enhancement (GLE) of June 11, 1991. The spectro-graphic global survey has been used. Variation spectra of primary CRs at different moments of the event are presented. Note that the CR variation spectra during this period are not described by a power or an exponential function of particle rigidity. The maximum rigidity, up to which the protons were accelerated on June 11, 1991, was ~2.8 GV (06:00 UT; i.e., two hours after GLE started). We show relative variations in the CR intensity in the geocentric solar ecliptic coordinate system during certain periods of the event under study. On June 11, 1991, the bidirectional anisotropy dominated in the distribution of particles with rigidity of 4 GV and 10 GV, which implies that the Earth passed the loop-like IMF structure.

Spectra of variations and cosmic ray anisotropy during GLE of June 11, 1991