The OI 135.6nm Observations of the Weddell Sea Anomaly and the Nighttime Mid- Latitude Enhancement

Details The OI 135.6nm Observations of the Weddell Sea Anomaly and the Nighttime Mid- Latitude Enhancement The OI 135.6nm Observations of the Weddell Sea Anomaly and the Nighttime Mid- Latitude Enhancement

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa43b1590h&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA43B-1590

Physics

0310 Airglow And Aurora, 2400 Ionosphere (6929)

Scientific paper

The paper reports the OI 135.6nm airglow emission observation of the ionospheric Weddell sea anomaly (WSA) and the middle-latitude region observed by the TIMED-GUVI. The WSA was first observed by single point ground-based ionosonde located in the Antarctica and featured by a greater nighttime ionospheric electron density than that in daytime in the Weddell sea region during local summer. Recently the anomaly was observed by wide-range total electron content (TEC) measurements collected by the TOPEX satellite and the GPS receiver network. From the TEC observation, the WSA spans in a large area. This study utilizes the two-dimensional global airglow map and vertical profiles derived from the limb scan of the TIMED- GUVI 135.6nm observations to further explore the three-dimensional structure of the WSA. From our observation, the WSA appears as the most prominent feature of the nighttime ionosphere at mid-latitude. Meanwhile, a similar feature also occurs in the northern hemisphere during local summer. The similar feature occurs in both the northern and southern hemispheres suggests that it is actually a nighttime mid-latitude enhancement. Our global and monthly observation of the nighttime mid-latitude enhancement reveals some possible physical mechanisms of the peculiar mid-latitude structure.

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