Data · dataset · 2026
Millstone Hill ISR measurements of small aspect angle spectra
Listed in National Center for Atmospheric Research
The Millstone Hill incoherent scatter (IS) radar is used to measure spectra close to perpendicular to the Earth's magnetic field, and the data are fit to three different forward models to estimate ionospheric temperatures.
Description
IS spectra measured close to perpendicular to the magnetic field are heavily influenced by Coulomb collisions, and the temperature estimates are sensitive to the collision operator used in the forward model.
The standard theoretical model for IS radar spectra treats Coulomb collisions as a velocity independent Brownian motion process. This gives estimates ofT(e)/T-i < 1 when fitting the measured spectra for aspect angles up to 3.6 degrees, which is a physically unrealistic result. The numerical forward model from Milla and Kudeki (2011, ) incorporates single-particle simulations of velocity-dependent Coulomb collisions into a linear framework, and when applied to the Millstone data, it predicts the sameT(e)/T(i)ratios as the Brownian theory.
Read the rest (2 more)
The new approach is a nonlinear particle-in-cell (PIC) code that includes velocity-dependent Coulomb collisions which produce significantly more collisional and nonlinear Landau damping of the measured ion-acoustic wave than the other forward models. When applied to the radar data, the increased damping in the PIC simulations will result in more physically realistic estimates ofT(e)/T-i. This new approach has the greatest impact for the largest measured ionospheric densities and the lowest radar frequencies.
The new approach should enable IS radars to obtain accurate measurements of plasma temperatures at times and locations where they currently cannot.
Links
Get the data
- Publisher page n2t.org/ark:/85065/d74f1tzq ↗
documentation · download · from data ucar edu
Where it is published
- data.ucar.edu /dataset/millstone-hill-isr-measurements-of-small-aspect-angle-… ↗
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=06955f96-987c-4e04-8d25-91becc088… ↗
metadata API · from data ucar edu
Topics
- From keywords
- Earth & Environmental Science · Ocean & Atmospheric Science
Provenance · 1 source records, 7 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| National Center for Atmospheric Research | 06955f96-987c-4e04-8d25-91becc088547 | 10 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 | |
| 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 |