[P-EM03] Mesosphere-Thermosphere-Ionosphere Coupling in the Earth's Atmosphere

[PEM03-07] Ionospheric Effects of Strong El Niño Southern Oscillation Conditions

★招待講演

*Thomas J Immel¹、Guiping Liu¹、Jeffrey Forbes²、Astrid Maute⁴、Vu Nguyen²、Ruth Lieberman³、Katelynn Greer¹ (1.University of California, Berkeley、2.University of Colorado、3.GATS Inc.、4.High Altitude Observatory)

キーワード：El Niño, Atmospheric physics, ionosphere, thermosphere

The occurrence of a very strong positive phase in the El Nino Southern Oscillation (ENSO) in late 2015 has had effects on weather around the entire planet. Furthermore, recent investigations show that ENSO-related changes in tropospheric water vapor and rainfall drive significant changes in the temperature and wind structure in the middle atmosphere, through the modification of the spectrum of atmospheric tides. Given that several components of the tidal spectrum can propagate into the thermosphere, ENSO-related changes at altitudes above the mesopause and into the ionosphere may be expected. Based upon historical events in 1997 and 1998, we will show the ionospheric and thermospheric variations one may expect for El Ni\~no and La Ni\~na conditions. We will also show middle atmosphere conditions measured by the NASA TIMED SABER instrument for the 2015-2016 event. These efforts are enabled in part by modeling capabilities developed for the upcoming NASA Ionospheric Connection Explorer mission.