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Parker Solar Probe, Take the Solar Plunge
JRehling
post Mar 3 2021, 12:38 AM
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Protons from the Sun are a type of cosmic ray and PSP is uniquely close to the Sun.

The trails can curve as they lose energy inside a solid medium.

Of course, one variable that drives up the number of artifacts is the exposure duration, and seeing the night side of Venus involves a relatively high exposure duration, but that depends on a lot of variables.

Deep Sky Object imagery is pretty prone to pick up on both cosmic ray hits and (from Earth, more likely) satellite / space junk / asteroid trails, and in images where you don't see those, there's a good chance that someone made an effort to remove them. I tend to shoot multi exposure images and when one out of many frames has such a flaw, I just don't use that frame for that part of the composite. for example.
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rlorenz
post Mar 4 2021, 04:08 AM
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QUOTE (JTN @ Mar 2 2021, 07:04 PM) *
In some frames, particularly the fourth frame in Ian R's latest (reproduced here), the tracks are curved, which makes me think they can't be cosmic rays


It is debris in the near field, being accelerated by electrostatic forces
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El Mitico
post Mar 29 2021, 05:14 PM
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Hi. Longtime lurker here....working in the field of cosmic rays

It seems to me that the image shows a combination of stellar objects on the background, producing the left to right streaks due to the long exposure, with stratight traces from cosmic rays on the ccd, plus particles moving in the near field during said exposure time. Why do they move like that? local electromagnetic fields from the spacecraft? radiation pressure?...no idea!. But electrostatic forces alone would produce more straight lines wouldnt they?
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JRehling
post Nov 9 2021, 03:22 PM
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The PSP is constantly being hit by hyper-velocity dust particles. It's easy to forget that PSP is not only coming into close proximity to the Sun, but also traveling through inter-planetary dust at unusually high velocities, making those impacts with microscopic dust particles far more impactful. This may speak to some of the earlier questions about image artifacts as a phenomenon which is, basically, so far unique to PSP alone among all interplanetary spacecraft.

https://phys.org/news/2021-11-tiny-grains-s...ty-impacts.html
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Holder of the Tw...
post Nov 9 2021, 06:30 PM
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From the report:

QUOTE
As Parker Solar Probe continues its journey of exploration near the sun, it can now add one more record to its long list: most sand-blasted spacecraft.


Ummm... how about Giotto?
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rlorenz
post Nov 10 2021, 03:05 AM
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QUOTE (JRehling @ Nov 9 2021, 10:22 AM) *
impacts with microscopic dust particles...... image artifacts as a phenomenon which is, basically, so far unique to PSP alone among all interplanetary spacecraft.


I thought some similar image features had been seen on STEREO. And the impacts on Juno's solar arrays as detected in its star trackers were used to map the distribution of dust in the Zodiacal cloud and determine a Mars system origin for some of the dust....
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stevesliva
post Nov 10 2021, 03:30 PM
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I am most taken aback by the mention of "paint chips." Keep your paint away from my spacecraft...
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JRehling
post Nov 11 2021, 01:28 AM
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Good catch, Ralph. I think the main difference with STEREO is that the impacts in that case led to fragmentation into smaller solid secondaries, while at the hypervelocity of PSP, the impactors are being turned into plasma.
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Holder of the Tw...
post Dec 14 2021, 11:08 PM
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Parker Solar Probe entered the solar corona for the first time during its eighth orbit back in April this year (2021). It has since flown by Venus again and just completed its tenth pass even closer.

This result released today. LINK: Touching the sun

YouTube video: Parker touches sun
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Holder of the Tw...
post Jan 20 2022, 03:49 PM
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Some rather unexpected results from the latest close flybys of the sun by Parker. Electromagnetic waves called "whistlers" help control heat flow in regions of the solar wind beyond 35 solar radii (about 0.16 AU). Inside of 28 solar radii however, the whistlers almost disappear, and instead there were electrostatic rather than electromagnetic waves that took over.

This is reported in a free access paper at the website for Astrophysical Journal Letters.

"The surprising observation that whistler-mode waves are almost never observed inside ∼28 Rs (∼0.13 au) is crucial for understanding the evolution of the solar wind close to the Sun. "

LINK: Article
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dtolman
post Feb 10 2022, 04:14 AM
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Not sure if this should go under Parker or Venus... but Parker's WISPR instrument got something unexpected when they took some nighttime shots, expecting to see cloud tops... the first visual light images of the surface of Venus! Apparently it glows enough in the near-infrared/far red spectrum to be picked up at night!. Never expected to see this - fantastic smile.gif



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Steve G
post Mar 16 2022, 10:34 PM
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Sad news to report

https://www.nasa.gov/press-release/nasa-mou...t-eugene-parker

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titanicrivers
post Sep 20 2023, 07:49 PM
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Scientists at Johns Hopkins Applied Physics Laboratory have released a video of the Parker Solar Probe passing through an especially powerful coronal mass ejection that took place last year. The video is here https://www.youtube.com/watch?v=FF_e5eYgJ3Y...chv=FF_e5eYgJ3Y
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titanicrivers
post Sep 25 2023, 08:38 PM
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And here is a link to the Spaceweather page of 9/6/2022 that contains observations of the CME of 9/5/2022 as observed by NASA's Stereo A and Europe's Solar Orbiter probes. https://spaceweather.com/archive.php?view=1...9&year=2022
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