Show simple item record

dc.contributor.authorHeino, Erkka Petteri
dc.contributor.authorVerronen, Pekka T.
dc.contributor.authorKero, Antti
dc.contributor.authorKalakoski, Niilo
dc.contributor.authorPartamies, Noora
dc.date.accessioned2019-12-17T09:37:00Z
dc.date.available2019-12-17T09:37:00Z
dc.date.issued2019-01-18
dc.description.abstractSolar proton events (SPEs) cause large‐scale ionization in the middle atmosphere leading to ozone loss and changes in the energy budget of the middle atmosphere. The accurate implementation of SPEs and other particle ionization sources in climate models is necessary to understand the role of energetic particle precipitation in climate variability. We use riometer observations from 16 riometer stations and the Whole Atmosphere Community Climate Model with added D region ion chemistry (WACCM‐D) to study the spatial and temporal extent of cosmic noise absorption (CNA) during 62 SPEs from 2000 to 2005. We also present a correction method for the nonlinear response of observed CNA during intense absorption events. We find that WACCM‐D can reproduce the observed CNA well with some need for future improvement and testing of the used energetic particle precipitation forcing. The average absolute difference between the model and the observations is found to be less than 0.5 dB poleward of about 66° geomagnetic latitude, and increasing with decreasing latitude to about 1 dB equatorward of about 66° geomagnetic latitude. The differences are largest during twilight conditions where the modeled changes in CNA are more abrupt compared to observations. An overestimation of about 1° to 3° geomagnetic latitude in the extent of the CNA is observed due to the fixed proton cutoff latitude in the model. An unexplained underestimation of CNA by the model during sunlit conditions is observed at stations within the polar cap during 18 of the studied events.en_US
dc.identifier.citationHeino EP, Verronen PT, Kero A, Kalakoski, Partamies N. Cosmic noise absorption during solar proton events in WACCM-D and riometer observations. Journal of Geophysical Research (JGR): Space Physics. 2019;124(2):1361-1376en_US
dc.identifier.cristinIDFRIDAID 1692759
dc.identifier.doi10.1029/2018JA026192
dc.identifier.issn2169-9380
dc.identifier.issn2169-9402
dc.identifier.urihttps://hdl.handle.net/10037/16928
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.ispartofHeino, E.P. (2019). Spatial extent of solar proton impact in the Earth's atmosphere - Observations and modeling. (Doctoral thesis). <a href=https://hdl.handle.net/10037/16914>https://hdl.handle.net/10037/16914</a>.
dc.relation.journalJournal of Geophysical Research (JGR): Space Physics
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223252/Norway/Birkeland Center for Space Science/BCSS/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2019 The Author(s)
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430::Astrophysics, astronomy: 438en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Astrofysikk, astronomi: 438en_US
dc.titleCosmic noise absorption during solar proton events in WACCM-D and riometer observationsen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


File(s) in this item

Thumbnail

This item appears in the following collection(s)

Show simple item record