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

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

51 Citas (Scopus)

Resumen

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.

Idioma originalInglés
Páginas (desde-hasta)1-4
Número de páginas4
PublicaciónGeophysical Research Letters
Volumen32
N.º24
DOI
EstadoPublicada - 28 dic. 2005
Publicado de forma externa

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