Energetics and structure of the lower e region associated with sporadic e layer

K. I. Oyama, K. Hibino, T. Abe, R. Pfaff, T. Yokoyama, J. Y. Liu

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2 Citations (Scopus)


The electron temperature (Te), electron density (Ne), and two components of the electric field were measured from the height of 90 km to 150 km by one of the sounding rockets launched during the SEEK-2 campaign. The rocket went through sporadic E layer (Es) at the height of 102 kmĝ€"109 km during ascent and 99 kmĝ€"108 km during decent, respectively. The energy density of thermal electrons calculated from Ne and Te shows the broad maximum in the height range of 100ĝ€"110 km, and it decreases towards the lower and higher altitudes, which implies that a heat source exists in the height region of 100 kmĝ€"110 km. A 3-D picture of Es, that was drawn by using Te, Ne, and the electric field data, corresponded to the computer simulation; the main structure of Es is projected to a higher altitude along the magnetic line of force, thus producing irregular structures of Te, Ne and electric field in higher altitude.

Original languageEnglish
Pages (from-to)2929-2936
Number of pages8
JournalAnnales Geophysicae
Issue number9
Publication statusPublished - 2008 Sept 1

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Geology
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science


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