Onset conditions for equatorial spread F determined during EQUIS II

Dave L. Hysell, M. F. Larsen, Charles M. Swenson, Aroh Barjatya, T. F. Wheeler, M. F. Sarango, Ron F. Woodman, J. L. Chau

    Research output: Contribution to journalArticle

    30 Citations (Scopus)

    Abstract

    An investigation into the dynamics and layer structure of the postsunset ionosphere prior to the onset of equatorial spread F (ESF) took place during the NASA EQUIS II campaign on Kwajalein Atoll on August 7 and 15, 2004. On both nights, an instrumented rocket measured plasma number density and vector electric fields to an apogee of about 450 km. Two chemical release rockets were launched both nights to measure lower thermospheric wind profiles. The Altair UHF/VHF radar was used to monitor coherent and incoherent scatter. In both experiments, strong plasma shear flow was detected. Periodic, patchy bottom-type scattering layers were observed in the westward-drifting plasma below the shear nodes. The large-scale plasma depletions that formed later during ESF reproduced the periodic structure of the original, precursor layers. The layers were therefore predictive of the ESF that followed. We surmise that collisional shear instabilities may have given rise to large-scale plasma waves that were highlighted by the bottom- type layer structure and that preconditioned the postsunset ionosphere for ESF.

    Original languageEnglish (US)
    Pages (from-to)1-4
    Number of pages4
    JournalGeophysical Research Letters
    Volume32
    Issue number24
    DOIs
    StatePublished - Dec 28 2005

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    spread F
    plasma
    rockets
    night
    ionospheres
    ionosphere
    shear
    wind profiles
    wind profile
    shear flow
    atoll
    plasma waves
    radar
    electric field
    depletion
    scattering
    electric fields
    experiment

    All Science Journal Classification (ASJC) codes

    • Geophysics
    • Earth and Planetary Sciences(all)

    Cite this

    Hysell, D. L., Larsen, M. F., Swenson, C. M., Barjatya, A., Wheeler, T. F., Sarango, M. F., ... Chau, J. L. (2005). Onset conditions for equatorial spread F determined during EQUIS II. Geophysical Research Letters, 32(24), 1-4. https://doi.org/10.1029/2005GL024743
    Hysell, Dave L. ; Larsen, M. F. ; Swenson, Charles M. ; Barjatya, Aroh ; Wheeler, T. F. ; Sarango, M. F. ; Woodman, Ron F. ; Chau, J. L. / Onset conditions for equatorial spread F determined during EQUIS II. In: Geophysical Research Letters. 2005 ; Vol. 32, No. 24. pp. 1-4.
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    Hysell, DL, Larsen, MF, Swenson, CM, Barjatya, A, Wheeler, TF, Sarango, MF, Woodman, RF & Chau, JL 2005, 'Onset conditions for equatorial spread F determined during EQUIS II', Geophysical Research Letters, vol. 32, no. 24, pp. 1-4. https://doi.org/10.1029/2005GL024743

    Onset conditions for equatorial spread F determined during EQUIS II. / Hysell, Dave L.; Larsen, M. F.; Swenson, Charles M.; Barjatya, Aroh; Wheeler, T. F.; Sarango, M. F.; Woodman, Ron F.; Chau, J. L.

    In: Geophysical Research Letters, Vol. 32, No. 24, 28.12.2005, p. 1-4.

    Research output: Contribution to journalArticle

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    Hysell DL, Larsen MF, Swenson CM, Barjatya A, Wheeler TF, Sarango MF et al. Onset conditions for equatorial spread F determined during EQUIS II. Geophysical Research Letters. 2005 Dec 28;32(24):1-4. https://doi.org/10.1029/2005GL024743