Solar X-flare - April 17, 2022. Active Region 12994, X1.1
These movies were generated around an X1.1 class solar flare that occurred on April 17, 2022.
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.
For More Information
Please give credit for this item to:
NASA's Scientific Visualization Studio
Datasets used in this visualization
SDO AIA 131 (A.K.A. 131 Filter) (Collected with the AIA sensor)
SDO AIA 171 (A.K.A. 171 Filter) (Collected with the AIA sensor)
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.