Data · dataset · 2026
The effects of IMF Bz periodic oscillations on thermospheric meridional winds
Listed in National Center for Atmospheric Research
Previous studies mostly focused on ionosphere and thermosphere responses to strong southward interplanetary magnetic field (IMF) B-z conditions.
Description
However, it is not clear how the ionosphere and thermosphere (IT) system responds to Alfvenic quasi-periodic oscillating IMF B-z conditions. In this article, simulations by the Coupled Magnetosphere Ionosphere Thermosphere model have been used to investigate the effects of IMF B-z temporal variations with 10-, 30-, and 60-min oscillation periods on the coupled IT system.
The simulation results show that the cross polar cap potential and auroral peak electron energy flux are stronger when the IMF B-z oscillation frequency is lower. The relatively small periodic wind responses in the 10-min IMF oscillation case indicates a low-pass filter nature of the magnetosphere-ionosphere-thermosphere system. Two different thermospheric wind (Vn) responses are revealed.
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One is the almost simultaneous responses at all latitudes, and the other shows a typical traveling atmospheric disturbances signature with a time delay with respect to the latitude for all UTs. The simultaneous Vn responses at all latitudes appear in the daytime Northern Hemisphere, which are mainly caused by the ion drag force in association with penetration electric fields induced plasma density and ion drifts changes.
The short-period traveling atmospheric disturbances occurring in the nighttime of both hemispheres and the daytime of the Southern Hemisphere propagate from high to low latitudes showing latitudinal dependence. Both responses oscillate with the same frequencies as those of IMF B-z oscillations.
Links
Get the data
- Publisher page n2t.org/ark:/85065/d75t3pk0 ↗
documentation · download · from data ucar edu
Where it is published
- data.ucar.edu /dataset/the-effects-of-imf-bz-periodic-oscillations-on-thermos… ↗
National Center for Atmospheric Research dataset page
landing page · from data ucar edu
Catalogue records · 1
- CKAN API data.ucar.edu/api/3/action/package_show?id=e9ca1092-ed51-4086-b3b7-9cd994f45… ↗
metadata API · from data ucar edu
Topics
- From keywords
- Earth & Environmental Science · Ocean & Atmospheric Science
- Inferred from text
- Simulation 75%
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| National Center for Atmospheric Research | e9ca1092-ed51-4086-b3b7-9cd994f45260 | 13 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| concepts[field].local:field:earth-environmental | mapping · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| concepts[method].local:method:simulation | enrichment · data ucar edu | keyword-concept-rules@1.0.0 | title+description (75%) |
| created_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| description | source · data ucar edu | connector:data_ucar_edu@1.0.0 | /notes |
| publication_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| title | source · data ucar edu | connector:data_ucar_edu@1.0.0 | /title |
| updated_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 |