LtE in CMO #255

From Edward Arnold GRAFTON


@. . . . . . From: "Ed Grafton" <egrafton@ghg.net>

To: <ALPO_Jupiter@yahoogroups.com>; <cmo@mars.dti.ne.jp>;<wupsalaa@bicc00.bi.ehu.es>; <DLehman111@aol.com>;<maple@quicklinks.on.ca>;<a.cidadao@mail.telepac.pt>;<captndifool@gmx.net>; <mars@ilcs.net>;<CPAJohnM@aol.com>; <dpeach78@netscapeonline.co.uk>;<H.J.Mettig@t-online.de>; <macdouc@prodigy.net>;<rbeebe@nmsu.edu>;<rhill@lpl.arizona.edu>;<schmude@falcon.gdn.peachnet.edu>;<rjkrejci@earthlink.net>;<sherrodc@ipa.net>; <park3232@bellsouth.net>;<w5ami@tcworks.net>; <SanjayL@ssec.wisc.edu>;<73737.1102@compuserve.com>;<toddwx@rcn.com>

Cc: <starman@usa.net>; <lx90@yahoogroups.com>; <gseronik@skypub.com>

Sent: Sunday, December 30, 2001 4:15 PM

Subject: Re: [ALPO_Jupiter] SEB splits into three

 

> Hi Frank and everyone,

I wonder if the third belt is a further extension of the S. Trop. band that began to emerge from the GRS in early Nov. and quickly extended to a small brown oval in the STZ at about CM2 20. The extensions movement from the GRS became arrested at this point and remained stable for a period of weeks.

Very little change occurred between 11-19-01

http://www.egrafton.com/11-19-01.jpg)

and 12-09-01 ( Don Parker Image )

http://www.egrafton.com/dec-09.jpg

 

In Don Parkers image a very tenuous belt can be seen further extending the emerged S. trop. band although faintly. It has clearly become more pronounced from Clay Sherrods image from Dec 27

http://www.arksky.org/asoimg/jupiter1227d.jpg

 

Below is an excerpt from a John Rogers email from 11-21-01:

> > The S.Trop.Band started emerging from the p. end of the GRS on Nov.2-7, and has now extended to the oval. (See Sherrod's 'GRSmosaic', and Grafton's images on Oct.23 and Nov.7 and 19.) This happens perhaps once a year or so, especially at the end of an episode of SEBs jetstream activity. Has the current episode just finished? - On Ed Grafton's images of Nov.18 & 19, there is still plenty of small-scale disturbance on SEBs but perhaps the substantial dark spots have subsided. Alternatively, the brown oval may have blocked SEBs jetstream spots from reaching the GRS and thus triggered the release of the dark material into the S.Trop.Band.

(30 December 2001 email)

 

@. . . . . . . . Subject: Jupiter Observation January 04 2001 at 05:45 UT

Hi Jupiter Observers,

The 3rd SEB can be seen in this image to be a further extension of the the S. Trop. band that began to emerge from the GRS in early Nov. and quickly extended to a small brown oval in the STZ at about CM2 20-25. The extensions movement from the GRS became arrested at this point and remained stable for a period of weeks through mid December. In late December Frank J Melillo and Clay Sherrod had made observations of further growth of the S. Trop. band.

The shadow in this image is from Io. As we are just past opposition Io's shadow is in close proximity to it. In this image Io can be seen just to the left and adjacent to the shadow and displays pronounced polar darkening of it's S. polar region.

On the S. edge of the NEB border past the CM a very bright and rather tiny spot is noted.

The weather in Houston was unusually cool with artic temperature dropped rapidly with the sunset and by 9 pm local time the temperature was 36 F. At this point, the artic high pressure had slipped slightly to the east giving Houston light SE winds and halting the rapid temperature drop allowing the sky to get fairly steady. The sky was very transparent, 9/10, and seeing was good, 7/10, with a 3 MPH SE wind. No dew was present.

 

Jupiter images : January 4th 2002 at 05:45 UT

http://www.egrafton.com/01-04-02.jpg

Ed Grafton, Houston Texas, ST6 CCD medium resolution mode 14 inch f/11 Celestron SCT Eyepiece Projection @ f/68 w/10mm plossel, projected 70mm, aprox. .23 arc seconds per pixel.

Image data:

2 BLUE + IR rejection, .6 seconds, Edmunds filters

2 GREEN + IR rejection, .6 seconds, Edmunds filters

2 RED + IR rejection, .6 seconds, Edmunds filters

1 IR blocker only .3 seconds, Edmunds IR Blocker

(5 January 2002 email)

 

@. . . . . . . . Here is another image from January 4th 2002. The S. trop. band can be seen to extend across the full face of the globe although it becomes very tenuous at CM2 of less than about 325. Polar regions of Io appear to be dark and an intense white spot is present on the S. edge of NEB near the CM.

Please note that the previous image that I sent today was taken at 05:48 instead of 05:45 (slow computer clock and slow brain). This has been corrected on the image file.

The sky was very transparent, 9/10, and seeing was good, 8/10, with a 3 MPH SE wind. No dew was present.

 

Jupiter images : January 4th 2002 at 05:16 UT

http://www.egrafton.com/1-04-02a.jpg

(5 January 2002 email)


Ed GRAFTON (Houston, Texas, USA)

egrafton@ghgcorp.com


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