SDO/HMI line-of-sight Dopplergram, 45-Second Data
Dopplergrams are maps of solar surface velocity. The HMI (Camera 2) instrument takes 72 filtergrams to construct a single dopplergram. Six filtergrams are taken in six positions across the nominal 6173.3 Å spectral line; each filtergram is taken in two polarization states (right circularly polarized (RCP), or Stokes I-V, and left circularly polarized (LCP), or I+V). Assuming that the absorption line is a Gaussian and that the HMI filter transmission profiles are delta functions, the Fourier coefficients can be calculated and are then used to estimate the line-of-sight magnetic field strength B.
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| bureauCode |
[
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|
| contactPoint |
{
"fn": "NASA Space Physics Data Facility",
"@type": "vcard:Contact",
"hasEmail": "mailto:NASA-SPDF-Support@nasa.onmicrosoft.com"
}
|
| description | Dopplergrams are maps of solar surface velocity. The HMI (Camera 2) instrument takes 72 filtergrams to construct a single dopplergram. Six filtergrams are taken in six positions across the nominal 6173.3 Å spectral line; each filtergram is taken in two polarization states (right circularly polarized (RCP), or Stokes I-V, and left circularly polarized (LCP), or I+V). Assuming that the absorption line is a Gaussian and that the HMI filter transmission profiles are delta functions, the Fourier coefficients can be calculated and are then used to estimate the line-of-sight magnetic field strength B. |
| distribution |
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|
| identifier | https://doi.org/10.48322/e9dg-yp34 |
| keyword |
[
"dopplergram"
]
|
| landingPage | https://doi.org/10.48322/e9dg-yp34 |
| license | https://www.usa.gov/government-works |
| modified | 2026-04-20 |
| programCode |
[
"026:000"
]
|
| publisher |
{
"name": "SDO HMI-AIA JSOC at Stanford",
"@type": "org:Organization"
}
|
| theme |
[
"Heliophysics"
]
|
| title | SDO/HMI line-of-sight Dopplergram, 45-Second Data |
