Abstract
Profiles of meridional neutral wind velocities in the height range 54–81 km with high temporal (minutes) and spatial resolution (1 km) from the EISCAT Incoherent Scatter Radar (ISR) at 933 MHz are presented. The data, obtained during three different solar proton events causing polar cap absorption (PCA) in 1989–1990, sometimes show slowly descending structures in the velocity profile which may be the signature of waves with vertical wavelengths as low as 10 km and periods from 9–14 hours.
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