Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11405306y&link_type=abstract
Journal of Geophysical Research, Volume 114, Issue A5, CiteID A05306
Physics
1
Ionosphere: Solar Radiation And Cosmic Ray Effects, Ionosphere: Equatorial Ionosphere, Ionosphere: Current Systems (2721), Ionosphere: Electric Fields (2712), Ionosphere: Ionosphere/Magnetosphere Interactions (2736)
Scientific paper
The solar flare effect (SFE) at dip equatorial latitudes sometimes shows the counter-S q variation around local noon. In this paper, we refer to this type of SFE as SFE*. Observations obtained by the Circum-pan Pacific Magnetometer Network (CPMN) reveal some previously unknown characteristics of SFE*. Some of these features are the following: (1) the counter-S q SFE variation is observed in limited longitude (local time) and latitude sectors (i.e., LT ≈ 1030-1300, ∣DipLat.∣ $\lesssim$ 1.5°), (2) outside this limited region, the amplitude of SFE(H) and preflare S q (H) have a linear relationship, and (3) SFE* is observed during the significant depression of the horizontal magnetic field at dip equatorial latitudes, which indicates the presence of westward electric fields whose origin remains to be understood.
Utada Hisashi
Watari Shinichi
Yamazaki Yasuhiro
Yoshikawa Akira
Yumoto Kiyo
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