Space Plasma Physics

Artist's impression of the Cluster quartet. (c) ESA
Artist's impression of the Cluster quartet. (c) ESA

The Space Plasma Physics group at MSSL is a leading, internationally recognised research group studying the physical interaction between the Earth and the Sun and the fundamental physics of space plasmas. The group has a history of producing instrumentation for, and analysing data from, international space exploration missions in collaboration with scientists around the world.

The group is heavily involved in the current Cluster mission and the proposed Solar Orbiter mission. Much of our research involves exploiting data from the Cluster mission, in conjunction with other missions and facilities. We also provide operational support and data processing for the Cluster and Double Star missions and the Cluster Active Archive. We have a number of PhD opportunities for students to study some of the many aspects of space plasmas.

Details of our mission involvement, research and upcoming projects can all be found on this site.

MSSL Space Plasma News

Dr. Colin Forsyth at RSGB Convention 2014

Dr. Colin Forsyth was invited to talk at the Radio Society of Great Britain's annual convention, held at Kents Hill Conference Centre in Milton Keynes. His talk, entitled HF Propagation Alphabet Soup covered the science behind standard global space weather indices and how these can be interpreted for high frequency radio wave propagation. More...

Cluster-MAARBLE-Van Allen Probes Workshop 2014

Prof. Andrew Fazakerley, Drs. Colin Forsyth and Dimitry Pokhotelov and students Kirthika Mohan and Ali Varsani all attended the 24th Cluster Workshop, entitled "Geospace Revisited" and held in conjunction with the Van Allen Probes and MAARBLE communities. The workshop took place at the Rodos Palace hotel on the greek island of Rhodes. More...

Solar Orbiter SWA Critical Design Review completes in ESTEC

Together with consortium colleagues from France, Italy and the USA, members of MSSL's PI team for the Solar Orbiter SWA investigation returned to ESTEC in the Netherlands for the 2-day co-location meeting for the Critical Design Review (CDR) of the SWA instrument suite. 

MSSL Space Plasma Science Nuggets

Schematic showing the layers of an FTE. From Varsani et al. (2014)

High-time-resolution observations of an FTE using Cluster

We have presented the Cluster observations of a crater FTE on 12 February 2007, when the quartet was located in the low-latitude boundary layer, and widely separated on the magnetopause plane. The passage of the structure was sequentially observed by Cluster 2, 3, 4 and 1 respectively, analysed in detail. But what are flux transfer events, and why are they important within the magnetosphere? More...

Azimuthal electric field PSD values derived from ground-based magnetometer measurements of the D-component magnetic field PSD at L = 7.94, 6.51, 5.40, 4.26, 4.21, 2.98, and 2.55. The dashed lines represent constant fits to these PSD values. From Ozeke et al. (2014)

New and improved analytic expressions for ULF wave radiation belt radial diffusion coefficients

Ozeke et al. [2014] presented analytic expressions for ULF wave-derived radiation belt radial diffusion coefficients, as a function of L and Kp, which can easily be incorporated into global radiation belt transport models. The diffusion coefficients are derived from statistical representations of ULF wave power, electric field power mapped from ground magnetometer data, and compressional magnetic field power from in situ measurements.

An example of the difficulty to visually define an time and location for auroral break-up, but how well an automated algorithm picks out this period of brightening. From Murphy et al. (2014)

Automated determination of auroral breakup during the substorm expansion phase using all-sky imager data

MSSL researchers participated in the development of a novel method for quantitatively and routinely identifying auroral breakup following substorm onset using the THEMIS (Time History of Events and Macroscale Interactions during Substorms) all-sky imagers.

. Field-Aligned currents observed by the AMPERE mission and ground perturbations of the Hall current components  of the substorm current wedge during three substorm expansion phases.  The polarisation ellipses point towards the centre of the substorm current wedge, and the integrated FACs from AMPERE show a significantly complex current structure results in a net upward and downward current structure as first identified by McPherron et al. [1973]. From Murphy et al. (2014)

The detailed spatial structure of field-aligned currents comprising the substorm current wedge

We present a comprehensive two-dimensional view of the field-aligned currents (FACs) during the late growth and expansion phases for three isolated substorms utilizing in situ observations from the Active Magnetosphere and Planetary Electrodynamics Response Experiment and from ground-based magnetometer and optical instrumentation from the Canadian Array for Realtime Investigations of Magnetic Activity and Time History of Events and Macroscale Interactions during Substorms ground-based arrays.

ULF waves in the Van Allen belts. Figure from Mann et al., (2013)

Discovery of the action of a geophysical synchrotron in the Earth’s Van Allen radiation belts

Although the Earth's Van Allen radiation belts were discovered over 50 years ago, the dominant processes responsible for relativistic electron acceleration, transport and loss remain poorly understood. Here we show evidence for the action of coherent acceleration due to resonance with ultra-low frequency waves on a planetary scale.

Page last modified on 16 aug 11 12:20