SEB and NEB のリフトについて John H. Rogers


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Best images of SEB and NEB rifts by John H. Rogers 2004/03/10

Best images of SEB and NEB rifts by John H. Rogers
Hi everyone,
Attached is a montage of the best recent images covering L1 ~ 100-130, the
region of the 'new S. Equatorial Disturbance' in SEBn, and of much
small-scale activity in NEBs related to the persistent NEB rifted region.
If anyone has equally hi-res images from this longitude and date range
that have not yet been processed, it would be very good to see them as
soon as possible.  As you see, there are many tiny spots which could trace
interesting motions related to the rifts in both SEBn and NEBs, if there
were a few more images to fill in the gaps.

Japanese
1系100〜130゜EZ NEB NEBs に小規模な活動がある。
SEBn と、 NEBs の両方にの亀裂まで続くと思われる多くの小さいスポットがある。

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Hi everyone,
Congratulations!-Antonio and Eric have got 3 hi-res images of the L1~100
region showing the SEB and NEB rifts at intervals of 1-2 jovian rotations.
Was it also captured today by any American observers one rotation later
and by East Asian observers after one more rotation??

Attached is an alignment (by eye) of the 3 images.  Rapid motions of tiny
features can indeed be seen, and some are indicated in the right-hand
panel: green, prograding; yellow, stationary; red, retrograding (relative
to the major NEBs features, which themselves may be slightly
retrograding).  On SEBn, three prograding white spots are marked (with
associated projections); these may represent the super-fast S. Eq.
jetstream. One of these white spots seems to be pouring out from the mouth
of the main rift (as in 1999/2000). The asterisk marks the focus of the S.
Eq. Disturbance, defined (as in 1999-2001) as the p. end of the SEB(N) at
the f. edge of the main rift.  On NEBs, the cluster of tiny dark spots
just p. the CM is the remains of projection c [see below*].  The largest
NEBs projection within it is prograding relative to the other spots, while
dark spots slightly further N are retrograding.

Hans-Joerg, you will be able to measure these motions accurately, and find
out whether they agree with the usual latitude/speed gradients, or not.
These chains of tiny spots may be waves or eddies excited  by the
turbulent rifts, and moving either with the usual latitudinal currents, or
with winds peculiar to these disturbances.

This shows how much can be obtained from your superb images now!

* [NEBs dark projection c was disrupted as it passed the NEB rifted region
(which is on the f. limb).  A detailed account of these NEBs projections,
with provisional names a,b,c...., and the persistent NEB rifted region,
and their interactions, will be produced within a few days.]

Clear and steady skies!
[John H. Rogers: British Astronomical Association.]

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