Dr Gareth Dorrian: Publications

Simultaneous interplanetary scintillation and Heliospheric Imager observations of a coronal mass ejection

Geophysical Research Letters American Geophysical Union (AGU) 35:24 (2008) 2008GL036181

Authors:

GD Dorrian, AR Breen, DS Brown, JA Davies, RA Fallows, AP Rouillard

Abstract:

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 kms−1 and 550 kms−1 for the leading and trailing fronts respectively. The plane‐of‐sky velocities determined from IPS ranged from 420 ± 10 kms−1 to 520 ± 20 kms−1. 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.

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The Solar Eruption of 2005 May 13 and Its Effects: Long-Baseline Interplanetary Scintillation Observations of the Earth-Directed Coronal Mass Ejection

The Astrophysical Journal American Astronomical Society 683:1 (2008) L79-L82

Authors:

AR Breen, RA Fallows, MM Bisi, RA Jones, BV Jackson, M Kojima, GD Dorrian, HR Middleton, P Thomasson, G Wannberg

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Developments in the use of EISCAT for interplanetary scintillation

Annales Geophysicae Copernicus GmbH 26:8 (2008) 2229-2236

Authors:

RA Fallows, AR Breen, GD Dorrian

Abstract:

Abstract. The antennas of EISCAT have been used for interplanetary scintillation (IPS) studies of the solar wind for many years. The main science found from these studies is obtained through the cross-correlation of signals from antennas having the longest baseline, providing more accurate information on the different solar wind streams which may be present in the line of sight. The development of dual-frequency IPS observations between the 1.4 GHz receivers at the remote sites and Tromsø, has allowed the use of the EISCAT Svalbard Radar for IPS, increasing the available baselines to the extent that three solar wind streams can sometimes be identified in the cross-correlation functions. A weak-scattering model incorporating three possible solar wind streams and dual observing frequencies is discussed and some results presented. A recent study found that the current sampling bandwidth limits the sensitivity of IPS observations at EISCAT. Methods of increasing the sensitivity, and the results of trials, are discussed.

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Combined STELab, EISCAT, ESR, and MERLIN IPS observations of the solar wind

SPIE Proceedings SPIE 6689 (2007) 668911-668911

Authors:

Mario M Bisi, Bernard V Jackson, Richard A Fallows, Andrew R Breen, P Paul Hick, Gudmund Wannberg, Peter Thomasson, Christine A Jordan, Gareth D Dorrian

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Dr Gareth Dorrian

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Simultaneous interplanetary scintillation and Heliospheric Imager observations of a coronal mass ejection

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The Solar Eruption of 2005 May 13 and Its Effects: Long-Baseline Interplanetary Scintillation Observations of the Earth-Directed Coronal Mass Ejection

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Developments in the use of EISCAT for interplanetary scintillation

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Abstract:

Combined STELab, EISCAT, ESR, and MERLIN IPS observations of the solar wind

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Dr Gareth Dorrian

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Simultaneous interplanetary scintillation and Heliospheric Imager observations of a coronal mass ejection

Authors:

Abstract:

The Solar Eruption of 2005 May 13 and Its Effects: Long-Baseline Interplanetary Scintillation Observations of the Earth-Directed Coronal Mass Ejection

Authors:

Developments in the use of EISCAT for interplanetary scintillation

Authors:

Abstract:

Combined STELab, EISCAT, ESR, and MERLIN IPS observations of the solar wind

Authors: