Coordinated observations of ionosphere-atmosphere coupling in the arctic using an HF Doppler system and an infrasonic wave detector

• Main Authors: Minami,Shigeyuki, Peterson,John W., Spell,D.David, Hunsucker, Richard D., Akasofu,Syun-Ichi
• Format: Report
• Language: English
• Published: Department of Electrical Engineering, Osaka City University/ Geophysical Institute, University of Alaska/Geophysical Institute, University of Alaska/Geophysical Institute, University of Alaska/ Geophysical Institute, University of Alaska 1991
• Subjects: Arctic; Fairbanks; Alaska
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4107; http://id.nii.ac.jp/1291/00004107/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4107&item_no=1&attribute_id=18&file_no=1

In an attempt to observe the dynamics of the ionosphere and its coupling at lower heights in high latitudes, an HF Doppler measurement system was coordinated with an infrasonic wave detector at Fairbanks, Alaska. The preliminary results show several characteristics which were not observed at lower latitudes. Widely spread Doppler shifts, saw-tooth-like Doppler shifts etc. were observed. Quasi-sinusoidal Doppler oscillations (period of 1 min to 1 h) related to the medium scale traveling ionospheric disturbances (TID's), which were probably caused by atmospheric waves or by auroral dynamics, were also observed that were similar to those observed in the lower latitude ionosphere. Some of the HF Doppler data seem to be correlated with atmospheric waves observed on the ground by infrasonic wave detectors. These data suggest direct evidence of energetic coupling between the ionospheric F, E layer and the ground through the middle atmosphere. HF Doppler data also show Pc3 range oscillations correlating with cosmic noise absorption (CNA) data.