Fifty Days of Continuous Sun from Solar Dynamics Observatory (171A filter)
Solar Dynamics Observatory (SDO) operates in a geosynchronous orbit around Earth to obtain a continuous view of the Sun. The particular instrument in this visualization records imagery in the ultraviolet portion of the spectrum at wavelengths normally absorbed by Earth's atmosphere - so we need to observe them from space.
This movie was generated as a test case for a new movie pipeline for SDO, here's SDO AIA 171A imagery, sampled every two minutes for 50 days (April 12 through June 3, 2014), resulting in 30 minutes of continuous play (at 20 frames per second).
There are a number of missing single missing datasets - mostly calibration and dark-frames. However there are a few larger gaps in the series, documented here:
|Start time (TAI)||End time (TAI)|
What is the PSF (Point Spread-Function)?
Many telescopes, especially reflecting telescopes such as the ones used on SDO (Wikipedia), have internal structures that support various optical components. These components can result in incoming light being scattered to other parts of the image. This can appear in the image as a faint haze, brightening dark areas and dimming bright areas. The point-spread function (Wikipedia) is a measure of how light that would normally be received by a single camera pixel, gets scattered onto other pixels. This is often seen as the "spikes" seen in images of bright stars. For SDO, it manifests as a double-X shape centered over a bright flare (see Sun Emits Third Solar Flare in Two Days). The effect of this scattered light can be computed, and removed, by a process called deconvolution (Wikipedia). This is often a very compute-intensive process which can be sped up by using a computers graphics-processing unit (GPU) for the computation.
Please give credit for this item to:
NASA's Scientific Visualization Studio
MissionsThis visualization is related to the following missions:
Datasets used in this visualization
SDO AIA 171 (171 Filter)ID: 680Collected with AIA JOINT SCIENCE OPERATIONS CENTER 2014-04-12T00:00:00 to 2014-06-03T23:57:59
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.