Global wave structures in the thermosphere observed by TIMED/GUVI

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Global wave structures in the thermosphere observed by TIMED/GUVI Yongliang Zhang, Larry J. Paxton and Robert Schaefer JHU/APL

Motivation: GOLD, ICON and TIMED carry FUV instruments How can we help the community use TIMED/GUVI data to support the GOLD and ICON missions?

FUV observation of species: O, N2, O2, H, N, NO, O+ N 1200A

O 1304A Lyman α NO ɛ band O 1356A N-1493A N-1743A N2 LBH GUVI dayside spectra on October 14, 2016, Along track pixel 9

TAD?

Courtesy of Gang Lu

Lat=-60, lon=210 UT: 20.5 160 km 852K (MSISE) GUVI: 830K lat=0, lon=120 UT=3. 160km: 753K (MSISE) GUVI: 710K lat=0, lon=225 UT: 20.5 GUVI T: 770K 160 km MSISE: 760K

MSISE: March 17, 2013, lat=0, lon=0, UT=12 (noon), T: at 160km 750K GUVI T: 690K (660-810K around the lat=0, lon=0, average 740)

Summary Model runs: LBH 145nm/141nm ratio quasi-linearly depends on N2 temperature around 160 km (peak emission altitude) TIMED/GUVI FUV spectrograph data Similar magnitudes of GUVI and MSISE T Mid-low lat: large scale structures (GW? TAD?, regardless geomagnetic activity) High-lat: T increase during storms Equator: longitude structure is likely modulated by tides. We are looking for model output or observational data that can help us confirm that this is a real effect. Once confirmed this could become a useful tool for understanding the thermosphere.