NASA's Parker Solar Probe recently passed through a powerful CME, offering groundbreaking observations that support a two-decade-old theory about CME interactions with interplanetary dust, pivotal for space weather predictions. On September 5, 2022, NASA’s Parker Solar Probe soared gracefully thr
theorized that CMEs may interact with interplanetary dust in orbit around our star and even carry the dust outward. CMEs are immense eruptions from the Sun’s outer atmosphere, or corona, that help drive space weather, which can endanger satellites, disrupt communications and navigation technologies, and even knock out power grids on Earth.
In-situ observations from Parker were critical to this discovery, because characterizing dust dynamics in the wake of CMEs is challenging from a distance. According to the researchers, Parker’s observations could also provide insight into related phenomena lower down in the corona, such as coronal dimming caused by low-density areas in the corona that often appear after CMEs erupt.
To locate this occurrence of decreased brightness, the team had to compute the average background brightness of WISPR images across several similar orbits – sifting out normal brightness variations that occur due to“Parker has orbited the Sun four times at the same distance, allowing us to compare data from one pass to the next very well,” Stenborg said. “By removing brightness variations due to coronal shifts and other phenomena, we were able to isolate the variations caused by dust depletion.
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