RAS "G/MIST" discussion meeting
November 9 2001

Geological Society Lecture Theatre, Burlington House, Piccadilly, London

[Report published in Astronomy & Geophysics 43, 1.26 (2002)]

A. Programme B. Report

Cluster - a new view of the magnetosphere

Organisers: Dr Mike Hapgood (RAL), Professor Peter Cargill (ICSTM) and Professor Manuel Grande (RAL)


Summary. The first results from the four-spacecraft Cluster mission will be reviewed. The solar wind, magnetopause, cusp and magnetosphere are seen in a new light with Cluster's unprecedented ability to distinguish between temporal and spatial variations, and to determine the 3-D structure of space plasmas. Similar insights into the magnetotail are expected as the orbit moves into that region.

10:00	Registration, Coffee and Poster set-up 

Morning Session
Chair: Professor Peter Cargill (ICSTM)

10:30 	Dr Mike Hapgood (RAL):"Cluster: overview and future plans" 

10:45 	Dr Malcolm Dunlop (ICSTM):"Results from the Cluster fluxgate
	magnetometer (FGM) experiment" 

11:10 	Dr Hugo Alleyne (Sheffield):"Results from the Cluster Digital Wave
	Processing (DWP) experiment" 

11:35 	Dr Jim Wild (Leicester):" Coordinated Cluster and ground-based
	studies: The story so far"

12:00 	Dr Chris Owen (MSSL/UCL):"Results from the Cluster PEACE experiment" 

12:25 	Dr Andrew Buckley (Sussex) Cluster Particle Correlators measurements
	of Electron Dynamics associated with Plasma Wave Emissions

12:40 	Professor David Southwood (ESA) "Forty years of waiting for Cluster"


Afternoon Session 
Chairman: Dr Mike Hapgood (RAL) 

13:55 	Dr Patrick Daly (Max Planck Institut für Aeronomie):"Results from the
	Cluster RAPID experiment" 

14:20 	Dr Iannis Dandouras (CESR):"Results from the Cluster CIS experiment" 

14:45 	Dr Elizabeth Lucek (ICSTM): "Cluster magnetic field observations of a
	quasi-parallel shock" 

15:00 	Professor Steve Schwartz (QMUL): " Strong Electron Heating and
	Electrostatic Potential at Quasi-perpendicular Shocks"

15:15 	Dr Tim Horbury (ICSTM): "Cluster magnetic field observations of the
	quasi-perpendicular bowshock"

15:30 Tea At Savile Row followed by the A&G (Ordinary) Meeting 


Dr Chris Perry, "The UK Cluster Data Centre"

Dr Patrick Chaizy, "The Cluster Joint Science Operations Centre"

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RAS G/MIST discussion meeting, 9 November 2001
Cluster - a new view of the magnetosphere

Meeting Report

by Mike Hapgood (Rutherford Appleton Laboratory)

Published in Astronomy & Geophysics 43, 1.26 (2002)

The RAS Discussion Meeting was entitled "Cluster - a new view of the magnetosphere" and began with an introductory talk by Mike Hapgood (RAL), who outlined the progress of the mission since its launch in the summer of 2000. He showed how the pre-cession of the Cluster orbits around the Earth had allowed the mission to sample different plasma regions in an annual cycle; the first cycle had almost been completed. He went on to describe future plans - in particular how changes in spacecraft separation would allow Cluster scientists to study the different plasma regions at different scale lengths and thus study different aspects of the plasma behaviour.

The meeting included several talks by researchers involved in the instrument teams. These included talks from all three UK-led instrument teams: Malcolm Dunlop (Imperial College) discussed work with the FluxGate Magnetometer (FGM), Hugo Alleyne (Sheffield) presented results from the Digital Wave Proces-sor (DWP) and Chris Owen (MSSL) discussed work with the Plasma Electron And Current Experiment (PEACE). In addition, Andrew Buckley (Sussex) reported on work with the particle correlator that forms part of DWP. The meeting also heard talks on two non-UK instruments: results from the CIS experiment were discussed by Iannis Dandouras (Centre d’Etude Spatiale des Rayonnements, Toulouse) and those from the RAPID experiment by Patrick Daly (Max-Planck Institut für Aeronomie, Katlenburg-Lindau). At this early stage in the analysis of Cluster, all the instrument reports stressed the work to establish the reliable calibration of their instruments which is, of course, essential in order to compare data from different spacecraft.

An important aspect of Cluster science is the comparison of spacecraft measurements with simultaneous ground-based measurements. The combination of these two different techniques is often a powerful test of current theories and has been strongly exploited by the UK community. Jim Wild (Leicester) reported on progress in exploiting Cluster data in this context.

The meeting also included talks on analysis of data taken during crossings of the bow shock, the shock generated when the solar wind first encounters and is slowed down by the obstacle formed by Earth’s magnetosphere. This region is a key target for Cluster and is crossed by the spacecraft for about six months every year. Elizabeth Lucek (Imperial College) and Tim Horbury (Imperial College) reported on analyses of magnetometer data during crossings of the bow shock while Steve Schwartz (QMUL) reported on behaviour of electrons in this region.

A highlight of the meeting was a talk by David Southwood (Director of Science at ESA) on his long involvement with the work that led to Cluster. He particularly noted that the need for a Cluster-type mission had first been posed by Jim Dungey (Imperial College) in his inaugural lecture in 1965. It was fitting that Jim was able to attend the present meeting to see his idea turned into reality.

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