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Geophysical Research Letters -- October 22, 1993 -- Volume 20, Issue 20, pp. 2299-2302

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Electric field measurements in the vicinity of noctilucent clouds and PMSE

Alexander M. Zadorozhny and Alexander A. Tyutin

Novosibirsk State University

Georg Witt and Nathan Wihelm

Department of Meteorology, Stockholm University

Urs Walchil

Physikalisches Institut Universitat Bern

John Y. N. Cho and Wesley E. Swartz

School of Electrical Engineering, Cornell University

We report mesospheric electric structure in the vicinity of noctilucent clouds (NLC) and polar mesospheric summer echoes (PMSEs) measured on the DECIMALS-B rocket payload launched during the international rocket-radar campaign NLC-91 from Esrange, Sweden on August 10, 1991. Unusually large vertical E-fields, E_z, about 100300 mV/m on ascent and greater than 1 V/m on descent were detected at 82.584.5 km. The region of the large E_z was clearly limited by the NLC layer on the bottom and by the distinctly separated PMSE layer on the top. A narrow negative peak in the E_z height profile observed on ascent in the lower part of the NLC layer was apparently caused by the interaction of the field mill with impacting NLC particles possibly carrying negative charge. If the impact signature is due to single particles, their size is estimate to at least 0.5 m and their concentration about 10⁴ cm³ locally. Based on the light-scattering properties of NLC such massive particles can only be a minor part of the NLC population. ©American Geophysical Union 1993

PACS: 92.60.Nv      Additional Information

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