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Proposal ID Verma_258

Date of Proposal Dec 12 2001

firstname
VIRENDRA KUMAR

lastname
Verma

institute
STATE OBSERVATORY

address
MANORA PEAK,
NAINITAL-263129,
INDIA

email
verma@upso.ernet.in

phone
+91-5942-37380

fax
+91-5942-35493

proposal
WE wish to study the role of coronal holes in the origin of
CME's origin. For This we will use EIT Flares Listing and LASCO
CME's Listing to identify the Solar active phenomena ( Flares
and active prominences ) including their locations and LASCO
CMEs List to identify their relationship. Further, We will be using
10830 data of KPNO, USA and these on synoptic map or disk map to
know the spatial relationship. As already indicated by us in earlier
study that there is strong possibility of origin of CME's in presence
of coronal holes.Earlier Verma and Pande(1989) using SOLWIND data reported that 61\%
CMEs were associated with CHs and suggested that the CMEs associated CHs
may be produced by some mechanism by which the mass ejected by some flares or
active prominences , gets connected with open magnetic field lines of CHs and
moves along these open magnetic field lines of CHs to produce large span CMEs.
The possible scenario of CMEs formation or
origin of the CMEs in the presence of CHs is shown Figure 5 ( Verma, 1998).

References:-

Verma, V. K. and Pande, M. C.:1989,{\it Proc. IAU Colloq. 104 " Solar
and Stellar Flares"} Poster Paper (Eds. B. M. Haisch and M. Rodono), Stanford
University, Stanford, USA, p. 239.

Verma, V. K.:1998,{\it J. Indian Geophy. Union,}{\bf 2,} 65.

inside_collab
DR. B. Thomson

consortium
no

topic
Coronal Mass Ejection

topic
Role of CORONAL HOLES in origin of CORONAL MASS EJECTIONS.

title
Role of CORONAL HOLES in origin of CORONAL MASS EJECTIONS.

update added on 2002/11/11 at 03:47:25
The Coronal Mass Ejections (CMEs) observed by the LASCO
coronagraph and associated solar activity phenomena whose
locations were identified by EIT and solar H-alpha flare
observations during year 2000 indicate that about 40%,
26% and 30% of CMEs were observed when there were coronal
holes (CHs) within 1-10, 11-20 and 21-40 degrees, respectively
from the location of solar H-alpha flares. From the above study
we are of the view, as also earlier suggested by Verma and
Pande(1989), that CMEs might have been produced by some
mechanism by which the mass ejected by the same solar
flares or active prominences connects with open magnetic
lines of CHs (source of high speed solar wind streams) and
moves along them to appear as CMEs. This result is under
publication as below:

Verma, V. K. 2002,Coronal Mass Ejections Relationship with Solar
Flares and Coronal Holes, Proc. Multi-Wavelength Observations of
Coronal Structure and Dynamics- Yohkoh 10th Anniversary Meeting
(Eds. P.C.H. Martens and D. Cauffman ), Elsevier Science Pub.USA,
in press.



References:

Verma, V. K. and Pande, M. C.:1989,{\it Proc. IAU Colloq. 104 " Solar
and Stellar Flares"} Poster Paper (Eds. B. M. Haisch and M. Rodono), Stanford
University, Stanford, USA, p. 239.


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