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Effects associated with the sector boundary crossing on July 8, 1966

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Abstract

Thirty hours after the proton flare of July 7, 1966, the earth and nearby satellites crossed a sector boundary of the interplanetary magnetic field. This occurred before the flare-associated shockwave arrived at the earth, so that the space was filled with energetic particles ejected from the flare. Satellite measurements have shown that in such a case <20 MeV protons are stored within the range of the sector boundary and with decreasing energy the particles tend to accumulate towards and behind the Eastern boundary limit; low-energy particles, such as <50 keV electrons, are stored exclusively behind this Eastern limit.

The boundary crossing caused a short-lived geomagnetic disturbance, a PCA enhancement in lower latitudes, a two-phase ionospheric disturbance, and a transient cosmic-ray decrease on neutron monitors looking westward immediately after the sector boundary passed the earth. The storage of low-energy particles on the Eastern side of the boundary may indicate a preference of the transverse diffusion for the Westward direction in interplanetary space.

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Authors and Affiliations

  1. Astronomical Institute of the Czechoslovak Academy of Sciences, Ondřejov, Czechoslovakia

    Z. Švestka

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  1. Z. Švestka
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Švestka, Z. Effects associated with the sector boundary crossing on July 8, 1966. Sol Phys 4, 361–372 (1968). https://doi.org/10.1007/BF00149567

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  • DOI: https://doi.org/10.1007/BF00149567

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