Proposal ID Gurman_1

Date of Proposal

96/03/07

name

Joseph B. Gurman

institute

NASA Goddard

address

NASA Goddard Space Flight Center
Code 682.3
Greenbelt MD 20771

email

gurman@gsfc.nasa.gov

phone

(301) 286-4767

fax

proposal

I propose to work with Dr. Craig DeForest (MDI) and the representatives
of other SOHO teams who took part in JOP 039 observation of south
polar plumes on 1996 March 7 to attemmpt to interpret:

1. the magnetic configuration of the footpoints of plumes,

2. the energy input to plumes from their footpoints,

3. whether plumes indeed align with network cell boundaries, and
if so, why some cells have plumes and some not, and

4. whether small "jet" events are common in or adjacent to polar
plumes, and if so, for how much of the high-latitude solar wind
flux they may be responsible.

The data I propose to use for this investigation are the images
taken during the JOP 039 offpoint, 1996/03/07 15:11 - 1996/03/08
00:43.

inside_collab

Dick Catura, if he's interested (and anyone else, too!)

consortium

yes

title

(none given)

update added on 1997/10/13 10:00:59

The data specified in this proposal have been reduced,
along with observations from CDS, SUMER, MDI, the Mk. III
ground-based coronagraph, as well as LASCO C2 and C3 observations
in the time period following the JOP 039 interval, to produce a
paper for the second "First Results from SOHO" issue of Solar
Phyiscs (vol. 175, 1997 October) by DeForest et al. ("Polar Plume
Anatomy: Results of a Co-ordinated Observation"). The principle
results deal with the visibility of the plumes in EUV and white
light (the latter, to 12 - 15 solar radii) and the nonradial
expansion of the plumes. An online version of this paper can be
found at:

http://mdiwww.nascom.nasa.gov/~zowie/papers/JOP-039/

Further work, on the variability of plumes and the possible
wave nature of some plume transients, can be found in DeForest
and Gurman, "Quasi-Periodic Compressive Waves in Polar Plumes,"
in the Proceedings of the 5th SOHO Workshop (ESTEC, 1997). An
online preprint can be found at:

http://mdiwww.nascom.nasa.gov/~zowie/papers/plume-variability/

A more extensive version of this work is in preparation for
submission to Ap.J. Letters.

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