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Ann. Geophys., 23, 2347-2355, 2005
www.ann-geophys.net/23/2347/2005/
© European Geosciences Union 2005
Multi-layer structure of mid-latitude sporadic-E observed during the SEEK-2 campaign
M. Wakabayashi and T. Ono
Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
Abstract. In the mid-latitude ionospheric region, sporadic-E layers (Es layers)
have often been observed, revealing multiple layers. The Es layers
observed during the SEEK-2 rocket campaign showed double electron density
peaks; namely, there are stable lower peaks and relatively unstable upper
peaks. We examined the effects of wind shear and the electric fields on the
generation of the multiple layer structure, in comparison with the electron
density profile, the neutral wind, and the DC electric field observed by the
S310 rocket experiments. The results showed that the neutral wind shear is
mainly responsible for the generation of the lower layer, while the DC
electric field makes a significant contribution to the formation of the
upper layer. The difference between the lower and upper layers was also
explained by the enhanced AC electric field observed at about 103–105 km
altitude. The external DC electric field intensity is expected to be
~5 mV/m,
which is enough to contribute to generate the Es layers in the
ionosphere.
Keywords. Ionosphere (Electric fields; Ionospheric irregularities,
Mid-latitude ionosphere)
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