2010年7月13日 · 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).

SDO is designed to help us understand the Sun's influence on Earth and Near-Earth space by studying the solar atmosphere on small scales of space and time and in many wavelengths simultaneously.

Helioseismic and Magnetic Imager (HMI): is one of three instruments aboard the Solar Dynamics Observatory (SDO) designed to study oscillations and the magnetic field at the solar surface.

The primary goal of the Helioseismic and Magnetic Imager (HMI) investigation is to study the origin of solar variability and to characterize and understand the Sun's interior and the various …

The Helioseismic and Magnetic Imager (HMI) provides full-disk, high-cadence Doppler, intensity, and magnetic images at 1′′ resolution (4096×4096-pixel images) of the solar photosphere, allowing studies of the sources and evolution of activity within the solar interior.

HMI is the name of one of the instruments on SDO and is also the name of a science investigation. This article provides a terse overview of both aspects of HMI primarily as an introduction to several more detailed articles.

2012年11月20日 · The Helioseismic Magnetic Imager (HMI) aboard the Solar Dynamics Observatory takes a series of images every 45 seconds in a very narrow range of wavelengths in visible light of the solar photosphere. The wavelengths correspond to a region around the 6173 Ångstroms (617.3 nanometers) spectral line of neutral iron (Fe I).

AIA and HMI data are once again available at the JSOC. Congratulations to the HMI team for getting the JSOC rebuilt, running, and serving data! SDO is designed to help us understand the Sun's influence on Earth and Near-Earth space by studying the solar atmosphere on small scales of space and time and in many wavelengths simultaneously.

2024年11月26日 · HMI measures the Sun's magnetic field over the entire visible disk with 1 arc second resolution. Magnetograms are available with a cadence of 45s (line-of-sight) and 720s (line-of-sight and vector). Definitive data products are generally available in a few days.

The Helioseismic and Magnetic Imager (HMI) on NASA’s Solar Dynamics Observatory (SDO) produces a wide variety of magnetic field data products including 45-second line-of sight magnetograms, 12-minute vector fields in HMI Active Region Patches (HARPs), synoptic maps, and synchronic frames, model calculations of the coronal field and solar