MIST

Magnetosphere, Ionosphere and Solar-Terrestrial

Latest news

Representing the MIST Community in award nominations

MIST Council has recently launched an effort to create an award nominations task force with the following aims:

  1. Actively contribute towards more equal representation and a diverse range of nominees for awards
  2. Recognise and promote the work of overlooked members of the community
  3. Provide a means for students and ECRs to gain experience in preparing an effective nomination package

The initial plan is to start by considering those awards given out by the Royal Astronomical Society. This is so there will be sufficient time to prepare nomination packages by the RAS deadline (July 2020), and the wide range of awards will allow us to consider the entire MIST community. The task force is spearheaded by Oliver Allanson, Jasmine Sandhu, and Maria-Theresia Walach.

This task force is inspired by Liz MacDonald, a heliophysicist at NASA’s Goddard Space Flight Center. Liz Macdonald organized the Nomination Task Force within AGU’s Space Physics and Aeronomy (SPA) section, which has been summarised in an article in Eos. We plan to work in a manner similar to that described in the article, as we believe that by having a community task force we will be able to achieve community-wide representation in a timely manner.

If you would like to be part of the task force then please sign-up using our Google Form by Friday 4th October. At this stage we are not soliciting for specific ideas for nominees. Instead we are seeking to gauge support and receive feedback. We would like to emphasise that all members of the MIST community are welcome, and indeed encouraged, to sign-up to to join this task force, from PhD student to Emeritus Professor.

New MIST Chair and Vice-Chair elected

Congratulations to John Coxon on becoming MIST Chair, and to Jasmine Sandhu on becoming MIST Vice-chair in a unanimous vote at a Council meeting last week.
 
MIST Council elects a new Chair whenever the previous Chair steps down, and in addition this year, the council has decided to elect a Vice-Chair for the first time.
 
On behalf of the MIST community, we would like to thank Ian McCrea for doing a superb job as Chair during his tenure on the Council.

EGU elections now open

The call for candidates for the EGU 2019 elections is currently open, with a deadline of 15 September 2019. The following roles are up for election: Union President, General Secretary, and the Division Presidents. More details about these roles and how you can nominate yourselves/colleagues can be found on the EGU website. 
 
MIST Council would like to emphasise that this is an excellent opportunity to contribute to and shape the field on an international scale, and we hope to see members from the MIST community putting themselves forward.

Summer Science Exhibition 2020

The Royal Society is currently accepting proposals for the Summer Science Exhibition 2020, and the deadline for proposals is 10 September 2019. Further details on applying can be found here.
 
MIST Council would like to highlight that this is an excellent opportunity for cross-institutional collaborations! The MIST community is involved in a number of projects with a particularly timely aspect (e.g. Solar Orbiter and SMILE), which would be very appropriate to propose to the Royal Society. If you are currently preparing a proposal that you are happy to invite community members to join or you have an idea for a proposal that you would like to work with the community on, then please email This email address is being protected from spambots. You need JavaScript enabled to view it. with a short outline by 9 August 2019. We hope to then share these projects with the community to build support for the proposals and involve the wider community!
 
We will be discussing this further and sharing ideas on the #public-engagement channel on the MIST Slack workspace. If you aren’t on the MIST Slack workspace then click here for details.

2019 Rishbeth prize winners announced

We are pleased to announce that the Rishbeth Prizes this year are awarded to Affelia Wibisono and Michaela Mooney , both of the Mullard Space Science Laboratory (UCL).
 
Affelia Wibisono wins the prize for the best MIST student talk, entitled “Jupiter’s X-ray Aurorae as seen by XMM-Newton concurrently with Juno”. Michaela wins the best MIST poster prize, for a poster entitled “Evaluating auroral forecasts against satellite observations”.
 
MIST Council would like to congratulate both Affelia and Michaela. As prize winners, Affelia and Michaela have been invited to write articles for Astronomy & Geophysics, which we look forward to reading.

Inter‐hemispheric survey of polar cap aurora

By Jade Reidy, Department of Physics and Astronomy, University of Southampton, UK.

The formation mechanism of polar cap arcs is still an open question. Since they were first discovered (over a century ago), there have been conflicting reports of polar cap arcs forming on open field lines [e.g., Hardy et al., 1982; Carlson and Cowley, 2005] and on closed field lines [e.g., Frank et al., 1982; Fear et al., 2014]. It is possible that there are more than one type of formation mechanism [e.g., Newell et al., 2009; Reidy et al., 2017].

Reidy et al. [2018] investigates the interhemispheric nature of polar cap arcs using low-altitude ultraviolet imaging, combined with particle data, to determine whether they occur on open or closed field lines. Figure 1 shows an example of an image from SSUSI (Special Sensor Ultra-Violet Spectrographic Imager) (left) with the corresponding SSJ/4 particle spectrograms (right). The SSUSI instruments, on board DMSP (Defence Meteorological Satellite Program) spacecraft, are UV imagers that scan across the polar regions, building up images over 20 minutes. The SSJ/4 particle spectrometer is also on board DMSP spacecraft and provides measurements of the particle precipitation directly above the spacecraft.

In Fig. 1 the SSUSI image has been projected on to a magnetic local time grid with noon at the top and dawn to the right. The black and grey dashed lines on the particle spectrograms and corresponding black and grey vertical lines on the DMSP footprint (black line on the SSUSI image) give an estimated position of the poleward edge of the auroral for the electrons and ions respectively (see Reidy et al. [2018] for details). Multiple sun-aligned arcs can be seen poleward of this edge, hence assumed to be occurring within the polar cap. The arcs seen on the dawnside of the SSUSI image are associated with ion and electron precipitation (indicated by red bars on both the DMSP track and the particle spectrograms), similar arcs were also seen in the opposite hemisphere. These arcs are consistent with formation on closed field lines [Fear et al., 2014; Carter et al., 2017]. The arc seen on the duskside of the polar cap is associated with electron-only precipitation (indicated by yellow bars). This kind of particle signature is consistent with accelerated polar rain and is hence consistent formation on open field lines [Newell et al., 2009; Reidy et al., 2017].

Reidy et al. [2018] investigated 21 events in December 2015 using SSUSI images and corresponding SSJ/4 data. Nine of these events contained arcs consistent with a closed field line mechanism, i.e. arcs associated with ion and electron precipitation present in both hemispheres (similar to the arcs on the dawnside of Fig. 1). Six of these events contained arcs that were associated with electron-only precipitation, consistent with an open field line mechanism (e.g. the duskside of Fig. 1). Examples of events containing arcs that were not, at first sight, consistent with either an open or a closed field line formation mechanism are also explored. This study shows the complex nature of polar cap arcs and highlights the needs for future study as there is still much to understand about their formation mechanism.

Please see the paper below for more information:

Reidy, J., R.C Fear, D. Whiter, B.S. Lanchester, A.J. Kavanagh, S.E. Milan, J.A. Carter, L.J. Paxton, and Y. Zhang. (2018), Inter‐hemispheric survey of polar cap aurora, J. Geophys. Res. Space Physics, 123. https://doi.org/10.1029/2017JA025153

Figure 1. An image from the SSUSI instrument on board DMSP spacecraft F17 is shown on the left. The time at the top of the image indicates the time when the spacecraft crossed 70 degrees magnetic latitude as it passed from dawn to dusk (i.e. left to right). The corresponding data from the SSJ/4 particle spectrometer is shown on the right with the electron spectrogram in the top panel and the ion spectrogram at the bottom. Precipitation associated with polar cap arcs is indicated on the DMSP track on the SSUSI image (indicated by a black line) and the particle spectrograms in red for ion and electron signatures and orange for electron-only signatures.