Data · dataset · 2026
Solar cycle variations of thermospheric O/N longitudinal pattern from TIMED/GUVI
Listed in National Center for Atmospheric Research
Thermospheric composition (O/N2 ratio) is well known to have a great impact on the variation of daytime ionospheric electron density.
Description
This study aims to investigate the local time, seasonal, and solar cycle variations of the O/N2 longitudinal pattern in both hemispheres during daytime in solstices. The O/N-2 data used are from TIMED/Global Ultraviolet Imager observations made over a solar cycle for geomagnetically quiet conditions.
The main findings are as follows:(1) The O/N-2 longitudinal patterns are generally similar during 10:00-14:00 LT and between solar minimum and maximum, although the O/N-2 values change with local time and solar cycle. (2) The winter O/N-2 subauroral enhancement is unexpectedly smaller in the longitudeswhere the magnetic pole is (near-pole longitudes), rather than in the longitudes far from the magnetic pole, especially during solar maximum, and consequently, the longitudinal pattern of O/N-2 depends on latitude in local winter.
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(3) The winter O/N-2 subauroral enhancement generally moves to more poleward latitudes during solar maximum, as compared to solar minimum. (4) At higher midlatitudes (similar to 45 degrees -60 degrees N and similar to 40 degrees-50 degrees S in geographic latitudes) in solar minimum, the winter-to-summer ratio of O/N-2 in each hemisphere has an obvious minimum in near-pole longitudes. This minimum becomes more evident during solar maximum.
The National Center for Atmospheric Research Thermosphere-Ionosphere-Electrodynamics General Circulation Model simulations indicate that in the winter hemisphere, the unexpected O/N-2 longitudinal pattern in higher midlatitudes is mainly associated with high-latitude Joule heating under the impact from ion convection and auroral precipitation.
Links
Get the data
- Publisher page n2t.org/ark:/85065/d72j6dn1 ↗
documentation · download · from data ucar edu
Where it is published
- data.ucar.edu /dataset/solar-cycle-variations-of-thermospheric-o-n-longitudin… ↗
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=f58d4677-7cea-44d2-8ab9-0d280232b… ↗
metadata API · from data ucar edu
Topics
- From keywords
- Earth & Environmental Science · Ocean & Atmospheric Science
- Inferred from text
- Longitudinal study 65% · Tropospheric and stratospheric physics 75%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| National Center for Atmospheric Research | f58d4677-7cea-44d2-8ab9-0d280232bb2e | 12 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| concepts[field].anzsrc:field:370109 | enrichment · data ucar edu | taxonomy-embedding@1.1.0 | title+keywords+description (75%) |
| 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:longitudinal-study | enrichment · data ucar edu | keyword-concept-rules@1.0.0 | title+description (65%) |
| 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 |