COMPARISON OF E-REGION ELECTRIC-FIELDS OBSERVED WITH A SOUNDING ROCKET AND A DOPPLER RADAR IN THE SEEK CAMPAIGN

This paper describes results from simultaneous measurements of mid-lat itude irregularities by a sounding rocket and a Doppler radar. The exp eriment was conducted on August 26, 1996 as part of the SEEK (Sporadic -E Experiment over Kyushu) campaign in Japan. Electric field observed with a double-probe sensor on the rocket showed very large fluctuation s of +/-10 mV/m where irregularity echoes were quite intense. Doppler velocities observed with the radar agreed well with the electric field s. We estimated growth rates of the gradient-drift instability, which showed positive values around the major sporadic-E layer. It was found that, within intense irregularity region with quasi-periodic structur es, there were large polarization electric fields that was likely to b e associated with spatial structure of the sporadic-E layer.