Table · dataset · 2026
SDO/HMI Linewidth, 45-Second Data
Listed in NASA Data Portal
The linewidth observable refers to the FWHM of the (assumed) Gaussian absorption line profile for the 6173.3 Å line on the surface of the sun.
Description
HMI samples the Fe I absorption line at 6173.3 Å at six points. Assuming that the "pure" solar Fe I line profile is a Gaussian, and the HMI filter filter transmission profiles are delta functions, the first and second Fourier coefficients of the of the Fe I line can be calculated and an estimate of the Doppler Velocity can be made.
An estimate (proxy) for the continuum intensity Ic is obtained by "reconstructing" the solar line from the estimates of the Doppler shift λo, the linewidth σ, and the linedepth Id. More details can be found at jsoc.stanford.edu/relevant_papers/observables.pdf.
Links
Get the data
- Resource sdac.virtualsolar.org/cgi/search?time=1&instrument=HMI&spectrum=1&version=current&bu… ↗
download · from data nasa gov
- Resource hmi.stanford.edu ↗
download · from data nasa gov
- Resource doi.org/10.1007/s11207-011-9834-2 ↗
download · from data nasa gov
- Resource helio.data.nasa.gov/dataset/SDO_HMI_Linewidth_Data_PT45S ↗
download · from data nasa gov
- Resource hpde.io/NASA/NumericalData/SDO/HMI/Linewidth_Data/PT45S ↗
download · from data nasa gov
- Resource jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Lw_45s%5B2020-01-01T00%3A00%3A00%2F6… ↗
download · from data nasa gov
Where it is published
- NASA Data Portal dataset page data.nasa.gov/dataset/sdo-hmi-linewidth-45-second-data ↗
landing page · from data nasa gov
- DOI doi.org/10.48322/k5gw-7c10 ↗
DOI / persistent id · from data nasa gov
Catalogue records · 1
- CKAN API data.nasa.gov/api/3/action/package_show?id=c2d1fc5b-886b-4424-a3c3-2745b93cf… ↗
metadata API · from data nasa gov
Topics
- From keywords
- Astronomy & Astrophysics · Earth & Environmental Science · Ocean & Atmospheric Science · Physics
Provenance · 1 source records, 10 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Data Portal | c2d1fc5b-886b-4424-a3c3-2745b93cf2b0 | 8 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| concepts[field].local:field:astronomy | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:earth-environmental | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:physics | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| created_date | source · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| description | source · data nasa gov | connector:data_nasa_gov@1.0.0 | /notes |
| license_text | source · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| publication_date | source · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| title | source · data nasa gov | connector:data_nasa_gov@1.0.0 | /title |
| updated_date | source · data nasa gov | connector:data_nasa_gov@1.0.0 |