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Proposal ID Gopalswamy_162

Date of Proposal Apr 1 1998

firstname
Nat

lastname
Gopalswamy

institute
The Catholic University of America

address
Code 682.3, Bldg 26, Room G-1
NASA/GSFC
Greenbelt, MD 20771

email
gopals@fugee.gsfc.nasa.gov

phone
301-286-5885

fax
301-286-0264

proposal
The primary objective of this proposal is
to study the structure and evolution of prominences and filaments at the
stationary and eruptive phases in order to understand the onset phase of
coronal mass ejections. Archival data and data from a multiwavelength
observing campaign involving the Very Large Array, the Nobeyama
radioheliograph in Japan and several instruments on board the SOHO
mission (EIT and LASCO) will be used to study the relation
between the prominence environment and the overlying coronal loops that
form the frontal loop of coronal mass ejections. Filament eruptions on
the solar disk provide information on the earth-directed coronal mass
ejections while prominence eruptions provide information on the vertical
structure of solar eruptions.

Specific tasks proposed:

1. We shall study the temperature structure of the filament and
prominence environments which is essentially the static or pre-eruption
phase of CMEs. We shall look for changes in the filament and prominence
environment that may posses clues to the subsequent eruption of CMEs.
We shall compare the EIT 304 images with radio images of
which provide information on prominence plasmas at different
temperatures (80,000 K and 8,000 K respectively).

2. We shall study the three part structure of CMEs observed by LASCO, in
the light of intermediate temperature images obtained by SOHO/EIT
in conjunction with Yohkoh X-ray and VLA/Nobeyama radio
observations. This way, we shall clarify the X-ray signatures of CMEs.

3. We shall study thermic and dynamic disparition brusques in order to
see if there is any relation between the two. This will serve as a new
way to characterize the pre-eruption state of coronal mass ejections.

We shall choose events that occur in the Nobeyama time window
for effective data comparison. EIT CME watch data and LASCO
synoptic data are adequate for our purposes.

Preliminary event list: Feb 07, 1997; Feb 23, 1997; Dec 14, 1997,
January 21, 1998.

Co-Investigators:

Y. Hanaoka (Nobeyama)
J. Gurman (NASA/GSFC)
C. St. Cyr (NRL)
N. Nitta (Lockheed)

inside_collab
J. Gurman

consortium
no

topic
Coronal Holes

topic
Filament Eruptions and CMEs

title
Filament Eruptions and onset Phase of Coronal Mass Ejections


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