> From jhr11@hermes.cam.ac.uk Thu Apr  8 14:48 MDT 2004
Date: Thu, 8 Apr 2004 21:44:00 +0100 (BST)
From: "J.H. Rogers" <jhr11@hermes.cam.ac.uk>
Subject: Activity in Jupiter's NEB


Hi everyone,

The NEB is becoming increasingly active, so it may be useful to give the
following list of disturbances presently visible in it.  Longitudes are
approximate L2 on April 1-7:

Main rifted region:  L2 ~ 310-360 (Apr.1), 300-350 (Apr.7).
Train of dark spots on NEBn*: L2 ~ 340-30.
Another sector of NEBn with dark projections developing: L2 ~ 60-90.
The little brown spot which appeared in NTropZ around Feb.9:  L2 ~ 140.
Long-lived white spot Z:  L2 ~ 155.
Chris Go's new rift which appeared around Mar.28:  L2 ~ 230 (Apr.1), 200
(Apr.7).

I would not be surprised if this developed into a NEB broadening event
during 2004, as in 2000.

*This train of dark spots on NEBn was strikingly regular in the last few
days. It is similar to the train of spots seen in Voyager images f.the
rifted region. The spots may be waves retrograding in L2.  They are best
shown in the following images: Pellier, Apr.1 (IR and violet; the stated
CM2 is wrong); Van der Velden, Apr.1; Fattinazzi, Apr.2; Sanchez, Apr.3;
Peach & Sanchez, Apr.6; Go, Apr.8.
_______________________________________________

John H. Rogers, Ph.D.
Jupiter Section Director,
British Astronomical Association.


_____________________

John H. Rogers, Ph.D.
Dept. of Physiology
University of Cambridge
Downing St.
Cambridge  CB2 3EG
U.K.

Tel. (0) 1223 3 33865
Fax  (0) 1223 3 33840
<jhr11@cam.ac.uk>
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