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When are energetic electrons producing NO directly in the upper stratosphere?

Salice, J., Nesse, H., Partamies, N., Kilpua, E., Kavanagh, A., Babu, E., Smith-Johnsen, C. (2023): When are energetic electrons producing NO directly in the upper stratosphere?, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0670

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Datensatz-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016818 Versions-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016818_1

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Urheber:
Salice, Josephine¹, Autor
Nesse, Hilde¹, Autor
Partamies, Noora¹, Autor
Kilpua, Emilia¹, Autor
Kavanagh, Andrew¹, Autor
Babu, Eldho¹, Autor
Smith-Johnsen, Christine¹, Autor

Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304

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Zusammenfassung: Compositional NOx changes caused by energetic electron precipitation (EEP) at a specific altitude are called the EEP direct effect. Changes co-dependent on vertical transport are referred to as the EEP indirect effect. The relative importance of EEP’s direct and indirect effect on NO and its subsequent impact on ozone and dynamic changes remain unresolved. The challenges are partly due to inadequate particle measurement and the relative scarcity of NO observations. Moreover, lower production rates in the mesosphere make it challenging to determine EEP’s direct impact on NO. In this study, the uncertainty of EEP observations is bypassed by exclusively identifying events applying NO-observations from the SOFIE instrument on board the AIM satellite. SOFIE daily averaged data from 2007 to 2014 is used to create a climatology based on the median of the data. A direct EEP-produced NO-event at 90 km is identified when the NO density surpasses the climatology by 100%. If the NO density exceeds 25% above the climatology at 80, 70, 60, and 50 km, the event qualifies as a "50km-event”. By contrasting the 90km and 50km events, the characteristics of the solar wind and geomagnetic indices, as well as observed electron fluxes from POES, are studied. The goal is to unravel when EEP can produce NO directly in the upper stratosphere. The results will contribute to developing a parameterization of EEP from the radiation belt that includes both the direct and indirect impact of EEP and, thus, deciphering the total EEP effect on ozone and atmospheric dynamics.

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Sprache(n): eng - Englisch

Datum: Final veröffentlicht: 2023

Publikationsstatus: Final veröffentlicht

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Identifikatoren: DOI: 10.57757/IUGG23-0670

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Titel: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)

Veranstaltungsort: Berlin

Start-/Enddatum: 2023-07-11 - 2023-07-20

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Titel: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)

Genre der Quelle: Konferenzband

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Ort, Verlag, Ausgabe: Potsdam : GFZ German Research Centre for Geosciences

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