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Welcome to the HMI Home Page

Stanford Solar Group

structure of the sun's interior

What is the Helioseismic and Magnetic Imager (HMI)?

HMI is an instrument designed to study oscillations and the magnetic field at the solar surface, or photosphere. HMI is one of three instruments on the Solar Dynamics Observatory; together, the suite of instruments observes the Sun nearly continuously and takes a terabyte of data a day. HMI observes the full solar disk at 6173 Å with a resolution of 1 arcsecond. HMI is a successor to the Michelson Doppler Imager on the Solar and Heliospheric Observatory.

What data products are available?

HMI provides four main types of data: dopplergrams (maps of solar surface velocity), continuum filtergrams (broad-wavelength photographs of the solar photosphere), and both line-of-sight and vector magnetograms (maps of the photospheric magnetic field). For more details (such as cadence, precision, accuracy, and dynamic range) of each data type, see the left sidebar on the JSOC page.

Where can I get HMI data?

The source of HMI data is the SDO HMI and AIA Joint Science Operations Center (JSOC).
You can also view the latest HMI images here.

Recent Findings Concerning SDO/HMI Science Goals

HMI Science Nuggets -- Short discussions and comments about recent findings.



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Page last revised Tuesday, July 13, 2010 14:18