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Proposal ID Ofman_31

Date of Proposal
96/09/16

firstname
Leon

lastname
Ofman

institute
Hughes STX/NASA GSFC

address
NASA GSFC
Code 682.1
Greenbelt, MD 20771

email
ofman@waves.gsfc.nasa.gov

phone
301-286-9913

fax
301-286-1617

proposal
Recent EIT observations and movies in the iron XII 195 line
indicate that small scale perturbations propagate along
coronal hole plumes outward at a speed of several hundred
km/sec. This perturbation, or microjets appear on a time scale
of minutes at seem to be abundant in the polar coronal hole.

We propose to measure the relation between the brigtness of these
microjets and their propagation speed. The brigtness, together with
a temperature measurement of the microjet plasma will allow to
determine the density of the propagating dsiturbance. The propagation
speed of such events can be measured by a time sequence observation.
In addition, we propose to measure the background density and
temperature of the plumes. The magnetic field at the base of the plumes
may be provided by MDI.

The propagation speed of the microjets will allow to determine
if these events are consistent with reconnection (i.e., the
reconnection jets propagate at the local Alfven speed) or some
other type of phenomena such as solitary waves.

The solitary waves propagate at a speed close to the sound speed.
These waves can be generated by torsional Alfven waves in the
plumes (Ofman and Davila 1996, ApJ, in press)
or possibly by other perturbations. In addition the solitary waves
have a well know relation between the phase speed and amplitude
which can be compared to the relation of the density enhancement
of the microjets to their propagation speed.

inside_collab
Joseph B Gurman

consortium
no

topic
Microjets

title
The relation between the propagation speed and brightness of microjets.


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