Solar X-flare - April 17, 2022. Active Region 12994, X1.1

  • Released Friday, August 19, 2022
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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.

These movies were generated around an X1.1 class solar flare that occurred on April 17, 2022.

The solar flare as seen in AIA 171 Angstrom filter. Correction is applied for the instrument Point-Spread Function (PSF).


The solar flare as seen in AIA 304 Angstrom filter. Correction is applied for the instrument Point-Spread Function (PSF).


The solar flare as seen in AIA 131 Angstrom filter. Correction is applied for the instrument Point-Spread Function (PSF).


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.

The solar flare as seen in AIA 304 Angstrom filter. No correction is applied for the instrument Point-Spread Function (PSF).


The solar flare as seen in AIA 131 Angstrom filter. No correction is applied for the instrument Point-Spread Function (PSF).


The solar flare as seen in AIA 171 Angstrom filter. No correction is applied for the instrument Point-Spread Function (PSF).


Time-stamp slates for these frames, organized by wavelength.

Time-stamp slates for these frames, organized by wavelength.

For More Information

See NASA.gov

Credits

Please give credit for this item to:
NASA's Scientific Visualization Studio

This page was originally published on Friday, August 19, 2022.
This page was last updated on Sunday, February 2, 2025 at 10:56 PM EST.

Datasets used

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