ResourceName
SDO/HMI line-of-sight Dopplergram
ReleaseDate
2024-11-01 00:08:46
RevisionHistory
RevisionEvent
ReleaseDate
2024-11-01 00:08:46
Note
Metadata created by SY
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.
PublicationInfo
Authors
The HMI Consortium: Stanford University (USA); NASA Goddard Space Flight Center (USA); Lockheed Martin Solar and Astrophysics Laboratory (USA); National Center for Atmospheric Research (USA);
PublicationDate
2011-01-21 00:00:00
PublishedBy
Joint Science Operations Center (JSOC), Stanford University
Contacts
InformationURL
Name
The HMI website at Stanford
URL
InformationURL
Name
The SDO/HMI Instrument paper
URL