Pc 3 magnetic pulsations observed at very low latitudes (|Φ|<20゜)

概要

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Magnetic pulsation data obtained simultaneously at northern and southern stations, i. e., Chung-Li (Ф=13.8°, Λ=189.5°), Taiwan, and Cepu (-18.3°, 182.5°), Indonesia, have been analyzed to clarify characteristics of Pc 3 pulsations at very low latitudes. Near local noon, although Pc 3 amplitudes at Cepu were slightly larger than those at Chung-Li, wave packets with ∿3-5min duration appeared concurrently at the very low latitudes (|Ф|<20°). It is found that the senses of Pc 3 polarizations at |Ф|〜10°-20° were statistically opposite to those at conjugate stations of |Ф|〜35°. Pc 3 polarization ellipses at the very low latitudes changed the major axis orientation predominantly from NW-SE (NE-SW) in the morning to NE-SW/NW-SE (NW-SE) in the afternoon in the northern (southern) hemisphere, which is consistent with the characteristics at conjugate stations of |Ф〜35°.