ResourceName
SDO/HMI line-of-sight Magnetogram
ReleaseDate
2024-10-11 00:08:46
RevisionHistory
RevisionEvent
ReleaseDate
2024-10-11 00:08:46
Note
Metadata created by SY
Description
Magnetograms are maps of the observed solar magnetic field in the photosphere. The line-of-sight component of the field can be accurately measured as it evolves in time over the full visible disk of the Sun. The HMI instrument exploits the Zeeman effect, which allows the strength of the line-of-sight component of the magnetic field to be determined by measurements of the spectral line in circularly polarized light.
HMI makes two independent measurements of the line-of-sight component of the photospheric magnetic field. One is collected every 45 seconds with the HMI Doppler camera. The other is computed every 720 seconds using filtergrams recorded by the Vector Field camera. The spatial resolution is 1 arc second (half arc-second pixels) and the full disk images are collected on a 4096**2 detector. The noise level is nominally between 5 and 10 Gauss. HMI really measures flux density in Mx/cm2 in each pixel.
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