Abstract
Based upon observations from a series of polar orbiting OGO satellites, the properties and structure of a “high latitude trough or hole” (HLT) or (HLH) in the topside ionosphere are summarized and correlated with the following terms, specifically in relation to ELF and VLF activity: (1) distinction from the midlatitude light ion trough (LIT) in H+, associated with the plasmapause; (2) a narrow, abrupt depletion in the concentrations of atomic ions H+, He+, O+, and N+; (3) molecular ion enhancements in NO+, O +2 , and N +2 ; (4) the > 30 keV electron trapping boundary; (5) the > 30 keV electron precipitation; (6)the electric field reversal; (7) the convective flow reversal; (8) the polar cap boundary. These observations are often well correlated with ELF and VLF activity, exhibiting enhancements in broadband auroral hiss, ELF noise and/or auroral kilometric radiation in the HLH region.
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References
H. Kikuchi et al., Trans. AGU 52, 307 (1971).
T. Laaspere et al., J. Geophys. Res. 76 4477 (1971).
H. A. Taylor, Jr. et al., J. Atmos. Terr. Phys. 37, 613 (1975).
J. M. Grebowsky et al., J. Geophys. Res. 81, 690 (1976).
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© 1979 D. Reidel Publishing Company
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Kikuchi, H. (1979). ELF and VLF Activity Associated with High Latitude Hole. In: Palmadesso, P.J., Papadopoulos, K. (eds) Wave Instabilities in Space Plasmas. Astrophysics and Space Science Library, vol 74. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-9500-0_2
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DOI: https://doi.org/10.1007/978-94-009-9500-0_2
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-009-9502-4
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