Juno perijove 6, May 19, 2017 |
Juno perijove 6, May 19, 2017 |
May 4 2017, 05:57 PM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Voting for Perijove 06 started yesterday, and it will last for another almost 7 days.
This time, I'm not quite free of bias, since I'm interested in an extension of the polar time-lapse sequence, especially in a coverage of the north and south polar FFRs and the presumed edge of the respective polar haze disks. I think - well, I'm rather certain - that it's possible to infer short-time dynamics of the FFRs, and of the vortices near the edge of the haze disk. Due to the expected good contact to Earth during the PJ-6 pass we have a good chance to obtain overlapping images of these regions. More in the discussion section on the missionjuno site. Of course, there are other interesting targets, too; see Glenn's and John Rogers' (Philosophia-47) comments. A full latitude coverage would allow for a pole-to-pole animation. |
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Jun 2 2017, 03:08 PM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Seán, Charley Locke just notified, that she completed her nice summary about your video.
I wondered, whether she would write a technical article with all the material I provided her, but I think this would have taken several days, at least. Regarding parallax: I tried to identify parallax effects since the first Jupiter flyby, but wasn't able to find some, thus far, in an unambiguous way. There is some tiny displacement for high velocity jets which could be confused with parallax. But the projection isn't quite perfect, so you get some artifacts from processing inaccuracies, too. Scroll down a bit this PJ1 article of John Rogers to see some animations. We see such tiny displacements in all perijoves with close-up images. |
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Jun 4 2017, 12:17 AM
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
Regarding parallax: I tried to identify parallax effects since the first Jupiter flyby, but wasn't able to find some, thus far, in an unambiguous way. There is some tiny displacement for high velocity jets which could be confused with parallax. But the projection isn't quite perfect, so you get some artifacts from processing inaccuracies, too. In studies/metrics of human visual perception, there are well-known geometric circumstances that can yield higher resolution than other circumstances. For example, it is much, much easier to tell if a line has a horizontal displacement of size s in it (-------_______) than it is to determine if two lines have a difference of size s in their lengths. Looking at the Juno video, I wondered if there is something like that which could elucidate cloud heights. For example, if a higher cloud casts a shadow on a lower cloud, a single image may leave it ambiguous whether this is really a shadow as opposed to a dark curvilinear feature in a flat cloud deck. However, if it is a relief feature, then it should disappear when viewing the same region from the sunward direction. And even if it is not resolved very well, its apparent intensity should change as viewing perspective changes so as to emphasize or hide the shadow. The geometry of Juno's pole-to-pole passes might provide some very good opportunities to test this in the polar regions… not so much nearer the equator. |
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