MIST

Magnetosphere, Ionosphere and Solar-Terrestrial

Latest news

RAS Specialist Discussion suggestions invited

The RAS is inviting suggestions from Fellows of the RAS for Specialist Discussion meeting topics in the academic year 2019/20. These meetings are held on the second Friday of the month between October and May in a given academic year; the April meeting will be moved due to the second Friday being Good Friday. 

If you would like to organise one of these meetings, you can do so by submitting a proposal no longer than one A4 page. Geophysics proposals, including MIST science, should be sent to This email address is being protected from spambots. You need JavaScript enabled to view it., and the deadline is 1 March 2019.

Your proposal should include the title of the meeting; the names of the co-convenors (at least one of whom should be a RAS Fellow); the topics you intend to cover; the rationale (including timeliness); suggestions for invited speakers; and the preferred date for the meeting. More information, including detailed guidance, can be found on the RAS website.

 

RAS awards for 2019 announced

MIST Council would like to extend their congratulations to the 2019 Royal Astronomical Society award winners, as well as the recent AGU award winners. In particular, we congratulate the following MIST members recognised for their significant achievements:
  • Margaret Kivelson (UCLA) has been awarded the Gold Medal in Geophysics for a lifetime of outstanding achievement in understanding planetary magnetospheres and their connections to the planets they surround.
  • Tom Stallard (Leicester) has been awarded the Chapman medal in Geophysics for outstanding contributions to understanding planetary upper atmospheres and their interactions with their magnetospheres.
  • The Cluster Science and Operations Team have been awarded the Geophysics Group Award for their continued success ensuring the operations and scientific exploitation of the European Space Agency’s Cluster mission.
  • Mark Clilverd (British Antarctic Survey) has been awarded the James Dungey Lecture for their excellent research on energetic particle precipitation and its effects on the upper atmosphere and climate, and their vast experience delivering outstanding scientific talks to a broad range of audiences.
  • Julia Stawarz (Imperial College London) has been awarded the Basu United States Early Career Award for Research Excellence in Sun-Earth Systems Science for significant contributions in furthering understanding of collisional plasma turbulence and kinetic scale processes. 
MIST Council would also like to congratulate Fran Bagenal (Colorado), who has been awarded the AGU Van Allen Lecture for exceptional work on the understanding of planetary magnetospheres and outstanding contributions to planetary missions.

New community resources now available

MIST Council are pleased to announce three resources for the MIST community on the MIST website.

List of research groups

The list of MIST research groups has been updated to include the latest members of the MIST community, and to incorporate the latest links to their presences online. Old groups, or groups at institutions which have merged since the original list was written, are now excised, and the list should be an exhaustive and up-to-date list of British MIST institutions.

List of seminar speakers

We asked the MIST community to come forward and be listed on our list of seminar speakers, and the uptake has so far been very encouraging. The list ranges from relatively junior PhD students to academics at various institutions, and if you're arranging seminars for your research group, we would encourage you to take a look.

List of public engagement projects

Following the success of the recently-held Public Engagement in MIST (MIST+PE) symposium, there was an appetite for MIST Council to better advertise the public engagement being done at MIST institutions across the UK. The Public Engagement page on the MIST website aims to advertise the MIST community's strengths to the rest of the community.

If you spot omissions on any of the above pages, or would like us to include content, please This email address is being protected from spambots. You need JavaScript enabled to view it..

New mailing list for Python in space science

A new mailing list for space scientists who use Python has been founded. Angeline Burrell writes: 

There's been a recent push for more community python development and peer-to-peer support. Much of this is focused in the US at the moment, but as the results of the recent survey showed, MIST scientists are active or interested in python as well. If you would like to become involved, you can join the email list by contacting This email address is being protected from spambots. You need JavaScript enabled to view it..

The mailing list will comprise discussion as well as webinars/telecons from Python users, so the list should be useful for a range of abilities with Python. To join, please email This email address is being protected from spambots. You need JavaScript enabled to view it..

New MIST forum via Slack

In the days of yesteryear, there was a MIST forum provided for members of the MIST community to discuss things in a fashion more immediate and informal than email. It has been some years since the fabled MIST forum was a going concern, and in that time, the MIST Council has technically been in violation of the MIST Charter, which states that

MIST will provide an on-line forum to allow ongoing discussions and the formulation of ideas prior to public dissemination. This forum will be private, visible only to registered members; membership is restricted to active MIST scientists and is offered at the discretion of MIST council chair.

As a result of realising that the Charter mandates the maintenance of a forum, MIST Council have chosen to create a Slack workspace for the MIST community. If you would like to join, please This email address is being protected from spambots. You need JavaScript enabled to view it. specifying the email address you would like to use, and you will be invited to join.

Field line resonance in the Hermean magnetosphere: structure and implications for plasma distribution

by Matthew K. James (University of Leicester)

Mercury’s magnetosphere is the smallest and most active within our solar system, providing a unique laboratory for studying magnetospheric physics, where much can be ascertained using ultra low frequency (ULF) waves. ULF waves are a key mechanism in the transmission of energy, momentum and information around any magnetised plasma environment and have been observed in magnetospheres throughout the solar system (e.g. Mercury, Earth, Jupiter, Saturn and Ganymede). The frequencies and polarizations of a certain class of ULF waves, called magnetohydrodynamic shear Alfvén waves, can be used to diagnose the plasma mass loading within the magnetosphere. Shear Alfvén waves are transverse standing waves which exist on field lines bound at both ends to the planet in question, where the perturbed magnetic field is displaced azimuthally around the planetary magnetosphere. These waves are analogous to the waves standing on a guitar string, where only standing waves with discrete frequencies are supported. At Earth, these waves are often driven by solar wind forcing on the magnetosphere in a process known as field line resonance (FLR).

Until recently, it was thought that Mercury's magnetosphere was incapable of supporting such FLRs due to its relatively small size. Our study is the first statistical survey of FLRs in the Hermean magnetosphere; we used magnetic field observations from the spacecraft MESSENGER to detect 566 FLRs within the dayside of the magnetosphere. An example simulation of one such Hermean FLR is presented in the figure below, where the field oscillates with a combination of both the fundamental and second harmonic frequencies.The characteristics of these waves were used to determine plasma mass densities throughout the dayside magnetosphere. We also found that the structure of the resonant waves is highly asymmetric about the magnetic equator, with the largest field perturbations appearing north of the magnetic equator due to the offset of the magnetic dipole into the northern hemisphere of the planet.

For more information, please see the paper below:

James, M. K., Imber, S. M., Yeoman, T. K., & Bunce, E. J. (2019). Field line resonance in the Hermean magnetosphere: Structure and implications for plasma distribution. Journal of Geophysical Research: Space Physics, 124. https://doi.org/10.1029/2018JA025920

Figure: Top left panel shows the power spectrum of the poloidal (red), toroidal (green) and compressional (blue) components of a FLR detected using MESSENGER. The majority of the wave power is seen in the toroidal component at 25 mHz (fundamental frequency), some toroidal wave power is also present at 60 mHz (second harmonic). The top right panel is an animation showing how the displacement of the field line (solid green line) might vary with time, compared to the unperturbed field (dashed green line), as it oscillates with a combination of the two detected frequencies at the location of this resonance. The bottom panel contains an animation showing how the electric (yellow) and magnetic perturbation (blue) fields would vary in time along the length of the field line, x.