A Cluster of M-class solar flares from Active Region 13165

  • Released Tuesday, January 10, 2023
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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.

Here, Active Region 13165 (lower right of solar disk) fires of a cluster of M-class flares over a couple of days in mid-December 2022 (Solar Flares: What does it take to be X-class?). The point-spread function correction (PSF) has been applied to all the imagery on this page. An M6.3 flare erupts followed shortly by a smaller M3.2 flare.

The double flare event (M6.3 & M 3.2) of December 14, 2022 as seen in the SDO AIA 131 angstrom filter. The dark region around the central 'X' marking the flare is an artifact of the PSF correction. 'Flickering' in the images around the flare are created due to the 'flare mode' images which have a shorter exposure. Normalizing the solar disk to the same brightness in these frames enhances the background noise off the solar disk.


The next day, December 15, 2022, an M5.7 flare erupts from the same active region.

An additional larger flare event (M5.7) of December 15, 2022, as seen in the SDO AIA 131 angstrom filter.


In these examples of smaller flares, the flare is much more visible in the AIA 131 angstrom filter. However, in the 171 angstrom filter, the complex loop structure in the magnetic fields is more obvious

The double flare event (M6.3 & M 3.2) of December 14, 2022 as seen in the SDO AIA 171 angstrom filter.

An additional larger flare event (M5.7) of December 15, 2022, as seen in the SDO AIA 171 angstrom filter.

. The 304 angstrom filter shows the flows of gas filaments

The double flare event (M6.3 & M 3.2) of December 14, 2022 as seen in the SDO AIA 304 angstrom filter.

An additional larger flare event (M5.7) of December 15, 2022, as seen in the SDO AIA 304 angstrom filter.



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.

Time slates for the multiple movies above, for custom compositing. Make sure to match the event and frame tag for the SDO frames you are using.

Time slates for the multiple movies above, for custom compositing. Make sure to match the event and frame tag for the SDO frames you are using.

Credits

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

This page was originally published on Tuesday, January 10, 2023.
This page was last updated on Wednesday, May 3, 2023 at 11:43 AM EDT.

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