Released on November 20, 2012
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.
This movie is generated for a wavelength of 193 Ångstroms (19.3 nanometers) which highlights a spectral line emitted by iron atoms that have lost 11 electrons (also known as iron-12 or Fe XII) at temperatures of 1,000,000 K as well as iron atoms that have lost 23 electrons (also known as iron-24 or FeXXIV) at temperatures of 20,000,000K. The former represents a slightly higher region of the corona and the latter represents the much hotter material of a solar flare. This wavelength also makes coronal holes (which appear as dark regions near the solar surface) more visible.
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, 1/3 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.
GCMD keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 188.8.131.52.0