Parker Solar Probe, Take the Solar Plunge |
Parker Solar Probe, Take the Solar Plunge |
Jan 23 2020, 07:35 AM
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#121
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Junior Member Group: Members Posts: 48 Joined: 9-August 19 Member No.: 8644 |
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Jan 25 2020, 08:29 AM
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#122
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Junior Member Group: Members Posts: 48 Joined: 9-August 19 Member No.: 8644 |
NASA Parker Solar Probe view of Earth
Earth Image Dataset https://wispr.nrl.navy.mil/data/rel/fits/CAL1/20180925/ Context https://www.nasa.gov/feature/goddard/2018/p...ks-back-at-home
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Feb 9 2020, 08:55 AM
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#123
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Member Group: Members Posts: 401 Joined: 5-January 07 From: Manchester England Member No.: 1563 |
Hey guys, a huge slew of fascinating papers on Parker Solar Probe results - it looks like the near Sun environment is as complex and fascinating as anyone could wish for: https://iopscience.iop.org/issue/0067-0049/246/2
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May 2 2020, 09:38 PM
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#124
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Junior Member Group: Members Posts: 48 Joined: 9-August 19 Member No.: 8644 |
View of The Milky Way from NASA's Parker Solar Probe
Source (Encounter 4): https://wispr.nrl.navy.mil/wisprdata
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May 20 2020, 09:47 AM
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#125
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Junior Member Group: Members Posts: 48 Joined: 9-August 19 Member No.: 8644 |
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Jul 13 2020, 12:33 PM
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#126
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Member Group: Members Posts: 290 Joined: 29-December 05 From: Ottawa, ON Member No.: 624 |
Parker probe has been busy spying on comet NEOWISE. I still haven't seen it myself.
https://www.nasa.gov/feature/goddard/2020/n...-comet-neowise/ |
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Jul 13 2020, 07:36 PM
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#127
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Forum Contributor Group: Members Posts: 1372 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
Parker probe has been busy spying on comet NEOWISE. I still haven't seen it myself. https://www.nasa.gov/feature/goddard/2020/n...-comet-neowise/ I've spent the last 3 days unsuccessful too. Evening viewing starts for me tomorrow here in Florida. |
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Feb 24 2021, 09:55 PM
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#128
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Senior Member Group: Members Posts: 2084 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Fantastic image of Venus released from this flyby, seeing through to the surface.
https://www.nasa.gov/feature/goddard/2021/p...g-view-of-venus QUOTE This surprising observation sent the WISPR team back to the lab to measure the instrument’s sensitivity to infrared light. If WISPR can indeed pick up near-infrared wavelengths of light, the unforeseen capability would provide new opportunities to study dust around the Sun and in the inner solar system. If it can’t pick up extra infrared wavelengths, then these images — showing signatures of features on Venus’ surface — may have revealed a previously unknown “window” through the Venusian atmosphere.
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Feb 25 2021, 04:31 AM
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#129
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Junior Member Group: Members Posts: 24 Joined: 11-February 07 From: College Station, TX Member No.: 1709 |
Fantastic image of Venus released from this flyby, seeing through to the surface. https://www.nasa.gov/feature/goddard/2021/p...g-view-of-venus With guest appearance by Orion on the bottom right |
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Feb 26 2021, 02:03 AM
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#130
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
for those using Celestia and want to fallow along, i put up a SPICE enabled add on
-- there might still be a few bugs it is still a work in progress https://celestia.space/forum/viewtopic.php?f=6&t=20883 |
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Feb 26 2021, 04:12 AM
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#131
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 26 2021, 05:07 PM
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#132
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Senior Member Group: Members Posts: 1632 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
I wonder which IR wavelengths would be involved as it could indicate whether one could see either heat emissions, or sunlight scattered through the Venusian clouds. In this case we're looking at the night side, so it must be the heat emissions. The surface of Venus is so hot though that its IR emissions would peak at a relatively short wavelength, that would actually overlap somewhat with the solar spectrum around roughly 3 microns. A look at the atmospheric transmittance spectrum would be of interest.
-------------------- Steve [ my home page and planetary maps page ]
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Feb 26 2021, 09:49 PM
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#133
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
On Venus, the temperature varies very linearly with altitude. The atmosphere itself radiates in IR, but the surface is still much, much denser than even Venus's dense atmosphere, so what we primarily see is a measure of the altitude. It's been established that the thermal IR signature for the surface corresponds to about 1 micron. 2+ microns moves the observation vertically upward into the atmosphere, and examines structure in clouds. (I was pleased, in early 2020, to join the ranks of amateurs who have imaged the surface of Venus looking through the nightside clouds at 1 micron.)
What makes this more complicated is that there are windows in the atmosphere (of course, primarily CO2) that pass IR better than others. The planned emissivity observations that would take place in any of the proposed remote sensing missions to Venus would take advantage of these. I have to say that I'm quite surprised that the PSP imager achieved this level of signal pertaining to the surface of Venus. The detail is certainly there in certain narrow bands, but with a wide-band filter I would expect the noise to overwhelm the signal. I'm perplexed that PSP would achieve such a clear signal by accident, because it's quite difficult to do when trying to do so. One advantage for PSP vs. an earthbound observer is that from certain vantage points close to Venus and over its nightside, one can avoid much of the glare from the crescent of the dayside. Even a very slim crescent at the intense illumination of Venus's clouds can glare and ruin the image over much of the nightside. |
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Feb 27 2021, 01:13 AM
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#134
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Mar 3 2021, 12:04 AM
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#135
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Member Group: Members Posts: 200 Joined: 20-November 05 From: Mare Desiderii Member No.: 563 |
What's going on with all the streaks? These pictures make space seem very... not-empty.
This is the press release explanation, but I still have questions: QUOTE Bright streaks in WISPR, such as the ones seen here, are typically caused by a combination of charged particles — called cosmic rays — sunlight reflected by grains of space dust, and particles of material expelled from the spacecraft’s structures after impact with those dust grains. The number of streaks varies along the orbit or when the spacecraft is traveling at different speeds, and scientists are still in discussion about the specific origins of the streaks here. If it's dust and/or cosmic rays, why don't approximately all deep-space images have this sort of artifact? (I assume PSP isn't shedding orders of magnitude more material than other spacecraft at this point in its orbit.) Is there something special about the instrument or observation that makes it pick this stuff up? (I know it has a very wide FOV, where most imagers we're used to are very narrow, but I'm failing to understand why that would have this effect.) 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 (should be fast = straight)? But that seems like a lot of dust. What is going on in this picture? (I assume the more orderly streaks are curved star trails, so presumably the spacecraft was changing attitude during the observation.) |
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