The thermospheric effects of SSWs observed in 2009 and 2019 at mid latitudes of the Northern Hemisphere
- 1Istituto Nazionale di Geofisica e Vulcanologia (INGV), Rome, Italy (loredana.perrone@ingv.it)
- 2IZMIRAN-Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation
European and North American near-noontime ionosonde observations along with CHAMP and Swarm neutral density measurements were used during a major Arctic SSW in January 2009 and a minor Antarctic SSW in September 2019 to retrieve variations of thermospheric parameters (neutral composition, temperature, winds) related to these SSW events. Neutral density observations were used in the retrieval process as a fitted parameter. The main effect of SSW 2009 event is a strong decrease of the atomic oxygen [O] abundance in the thermosphere which is confirmed by satellite neutral gas density observations. Along with this no thermosphere cooling effects were revealed.
The duration of [O] decrease related to SSW is around 3-5 days in the vicinity of the SSW peak. The decrease of [O] depends on the intensity of SSW. The minor Antarctic SSW event in September 2019 manifested no pronounced thermospheric effects in the Northern Hemisphere.
How to cite: Perrone, L. and Mikhailov, A.: The thermospheric effects of SSWs observed in 2009 and 2019 at mid latitudes of the Northern Hemisphere , EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-1889, https://doi.org/10.5194/egusphere-egu23-1889, 2023.
