[P-EM13] Coupling Processes in the Atmosphere-Ionosphere System

[PEM13-21] Atmospheric Tides from 90 km to 250 km altitude as observed from the ICON-MIGHTI instrument.

★Invited Papers

*Chihoko Y Cullens¹、Jeffrey Forbes¹、Scott England³、Thomas J Immel²、Astrid I Maute⁶、Michael H Stevens⁴、Jonathan Makela⁵、Brian Harding² (1.University of Colorado Boulder、2.University of California Berkeley、3.Virginia Tech、4.Naval Research Laboratory、5.university of illinois urbana champaign、6.National Center for Atmospheric Research)

キーワード：ICON-MIGHTI, tides, HME

Atmospheric tides are an important driver for atmospheric coupling processes. However, observational studies of tidal climatology in the thermosphere are still rare due to the limited global wind observations of the thermosphere. ICON-MIGHTI was launched in October 2019 with data available since December 2019. MIGHTI measures zonal and meridional neutral wind spanning altitudes from ~94 km to ~250 km (local time coverage depends on altitudes) and temperature at all local times from ~90 km to ~108 km. Utilizing MIGHTI winds and temperature data, this work presents a climatology of atmospheric tides from 90 km to 250 km in the latitude range of 10°S to 40°N including diurnal, semi-diurnal, and terdiurnal tides. Tides derived from the MIGHTI measurements are then used for Hough Mode Extension fitting to estimate global tidal variabilities. A few key examples of MIGHTI tides, HME, and TIEGCM forced by MIGHTI-HME will be compared to discuss causes of tidal variability.