Physics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987angeo...5..455m&link_type=abstract
(URSI and High Altitude Observatory, International Symposium on Large-Scale Processes in the Ionospheric-Thermospheric System, B
Physics
D Region, Planetary Waves, Vertical Motion, Wave Propagation, Winter, Anomalies, Mesosphere, Satellite Observation
Scientific paper
The role of atmospheric planetary-scale waves in the occurrence of D-region winter anomaly is studied, comparing the changes in ionospheric absorption observed near Japan and in mesospheric wave activity estimated from radiance data obtained by the PMR on board NIMBUS 6. The comparison shows that the enhancement of ionospheric absorption is associated primarily with the amplification of planetary wave 1 in the mesosphere. However, the appearance of the anomaly at a local station is controlled by the zonal motion of the wave system. The amplification of wave 1 produces a change in mesospheric circulation temporarily. The modified circulation can explain well the features of the winter anomaly. Thus, it is suggested that a primary cause of the anomaly is the transport of nitric oxide from the auroral regions to midlatitudes by the disturbed circulation.
Labitzke Karin
Muraoka Yoshikazu
Petzoldt Karin
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