The Active Sun from SDO: HMI Magnetogram
The Solar Dynamics Observatory (SDO) observes the Sun with many different instruments, in many different wavelengths of light. Many of these capabilities are not possible for ground-based observatories - hence the need for a space-based observing platform.
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). From this series of images, it constructs a set of images which extract other characteristics of the photosphere. For this dataset, it measures the splitting of the spectral lines to determine the intensity of the magnetic field on the solar surface. White represents north magnetic polarity and black represents south magnetic polarity.
This visualization is one of a set of visualizations (others linked below) covering the same time span of 17 hours over the full wavelength range of the mission. They are setup to play synchronously on a Hyperwall, or can be run individually.
The images are sampled every 36 seconds, ⅓ of the standard time-cadence for SDO. This visualization is useful for illustrating how different solar phenomena, such as sunspots and active regions, look very different in different wavelengths of light. These differences enable scientists to study them more completely, with an eventual goal of improving Space Weather forecasting.
Stand-alone HD1080 movie of the HMI magnetograms.
Full-resolution 4Kx4K frames and 1Kx1K preview movies.
Please give credit for this item to:
NASA/Goddard Space Flight Center Scientific Visualization Studio, the SDO Science Team, and the Virtual Solar Observatory.
MissionsThis visualization is related to the following missions:
SeriesThis visualization can be found in the following series:
Datasets used in this visualization
SDO SDO Magnetogram (Magnetogram)ID: 675Data Compilation Collected with HMI 2011-09-25T08:00 - 2011-09-26T01:00
Note: While we identify the data sets used in these visualizations, we do not store any further details, nor the data sets themselves on our site.