Rights statement: Copyright 2008 by the American Geophysical Union.
Final published version, 456 KB, PDF document
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Simultaneous interplanetary scintillation and Heliospheric Imager observations of a coronal mass ejection
AU - Dorrian, Gareth
AU - Breen, Andy
AU - Brown, Daniel
AU - Davies, Jackie
AU - Fallows, Richard
AU - Rouillard, Alexis
N1 - Copyright 2008 by the American Geophysical Union.
PY - 2008/12/31
Y1 - 2008/12/31
N2 - We describe simultaneous Interplanetary Scintillation (IPS) and STEREO Heliospheric Imager (HI) observations of a coronal mass ejection (CME) on 16 May 2007. Strong CME signatures were present throughout the IPS observation. The IPS raypath lay within the field-of-view of HI-1 on STEREO-A and comparison of the observations shows that the IPS measurements came from a region within a faint CME front observed by HI-1A. This front may represent the merging of two converging CMEs. Plane-of- sky velocity estimates based on time-height plots of the two converging CME structures were 325 kmsﰀ1 and 550 kmsﰀ1 for the leading and trailing fronts respectively. The plane- of-sky velocities determined from IPS ranged from 420 ± 10 kmsﰀ1 to 520 ± 20 kmsﰀ1. IPS results reveal the presence of micro-structure within the CME front which may represent interaction between the two separate CME events. This is the first time that it has been possible to interpret IPS observations of small-scale structure within an interplanetary CME in terms of the global structure of the event.
AB - We describe simultaneous Interplanetary Scintillation (IPS) and STEREO Heliospheric Imager (HI) observations of a coronal mass ejection (CME) on 16 May 2007. Strong CME signatures were present throughout the IPS observation. The IPS raypath lay within the field-of-view of HI-1 on STEREO-A and comparison of the observations shows that the IPS measurements came from a region within a faint CME front observed by HI-1A. This front may represent the merging of two converging CMEs. Plane-of- sky velocity estimates based on time-height plots of the two converging CME structures were 325 kmsﰀ1 and 550 kmsﰀ1 for the leading and trailing fronts respectively. The plane- of-sky velocities determined from IPS ranged from 420 ± 10 kmsﰀ1 to 520 ± 20 kmsﰀ1. IPS results reveal the presence of micro-structure within the CME front which may represent interaction between the two separate CME events. This is the first time that it has been possible to interpret IPS observations of small-scale structure within an interplanetary CME in terms of the global structure of the event.
U2 - 10.1029/2008GL036181
DO - 10.1029/2008GL036181
M3 - Journal article
VL - 35
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 24
M1 - L24104
ER -