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SDO/HMI line-of-sight Dopplergram, 720-Second Data

(2011). SDO/HMI line-of-sight Dopplergram, 720-Second Data [Data set]. Joint Science Operations Center (JSOC), Stanford University. https://doi.org/10.48322/mn3e-wv09. Accessed on .

Note: Proper references, including those in BibTex or other formats, should include the "Accessed on date" as shown above to identify the version of the resource being cited in a given publication.

ResourceID
spase://NASA/NumericalData/SDO/HMI/LOS_Dopplergram/PT720S

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.

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Details

Version:2.6.1

NumericalData

ResourceID
spase://NASA/NumericalData/SDO/HMI/LOS_Dopplergram/PT720S
ResourceHeader
ResourceName
SDO/HMI line-of-sight Dopplergram, 720-Second Data
DOI
https://doi.org/10.48322/mn3e-wv09
ReleaseDate
2024-11-01 00:08:46
RevisionHistory
RevisionEvent
ReleaseDate
2024-11-01 00:08:46
Note
Metadata created by SY
RevisionEvent
ReleaseDate
2024-11-18 00:08:46
Note
Added DOI 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
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://SMWG/Person/Philip.H.Scherrer
2.GeneralContactspase://SMWG/Person/Rick.Bogart
InformationURL
Name
The HMI website at Stanford
URL
http://hmi.stanford.edu/
InformationURL
Name
The SDO/HMI Instrument paper
URL
https://doi.org/10.1007/s11207-011-9834-2
AccessInformation
RepositoryID
spase://SMWG/Repository/Stanford/HMI-AIA.JSOC
Availability
Online
AccessRights
Open
AccessURL
Name
JSOC Data Center
URL
http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.V_720s[2020-01-01T00:00:00/60m]
Style
Search
Description

Change the date and the time to find the HMI data.

AccessURL
Name
SDO/HMI Data Search via Virtual Solar Observatory
URL
https://sdac.virtualsolar.org/cgi/search?time=1&instrument=HMI&spectrum=1&version=current&build=1
Description

VSO path to JSOC-resident SDO HMI data files

Format
FITS
InstrumentIDs
spase://SMWG/Instrument/SDO/HMI
MeasurementType
Dopplergram
TemporalDescription
TimeSpan
StartDate
2010-04-24 19:11:26
RelativeStopDate
-P3D
Cadence
PT720S
ObservedRegion
Sun
ObservedRegion
Sun.Photosphere
Parameter #1
Name
FITS Data Array
Description

Line-of-sight velocity

Cadence
PT720S
Units
m/s
Particle
ParticleType
Ion
Qualifier
LineOfSight
ParticleQuantity
Velocity
SpatialCoverage
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
HPC
Description

Array size: 4096x4096
Pixel Resolution: 0.504 arcsec