Multi-scale dynamic auroral processes

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A RAS Specialist Discussion Meeting organised by *Colin Forsyth and Nadine Kalmoni (UCL-MSSL); Hanna Dahlgren (Southampton/KTH); Clare Watt (Reading)*Contact: Aurora occur on a range of time, spatial and energy scales at planets throughout the solar system and beyond. They are a key indicator of plasma-physical processes and the interconnectedness of the Sun and planets. Ionospheric auroral displays offer important insights into the full 3D dynamics of the coupled solar wind - magnetoshpere - ionosphere system. Mapping dynamic auroral features at a range of temporal and spatial scales into the magnetosphere can provide insights into the locations and growth of instabilities, changes in particle populations and the shape of the magnetosphere. Given the relative ease with which observations of the aurora can be made from the ground versus directly observing the source region in space, the aurora provide a key diagnostic tool for examining processes in the magnetosphere. Observations of the aurora with state of the art instrumentation have called into question some of our basic assumptions about the energisation of magnetospheric particles that lead to auroral emissions particularly in terms of the timescales involved and the spatial scales over which this occurs, whilst space telescopes continue to provide new insights into high energy auroral processes at other planets. In-situ magnetospheric measurements also continue to provide crucial information on the characteristics of the auroral particle populations and their source regions. In the future, it is hoped that new multi-platform missions will provide continuous, unimpeded views of the aurora as well as observing temporal changes in the particle and electromagnetic structures and waves that drive them. In this meeting, we will bring together papers discussing aurora at a range of time, space and energy scales along with the processes that drive them to determine new commonalities and new difficulties in our understanding of these dynamic phenomena. 10:00 Welcome and coffee 10:30 Small-scale auroral structures and their electron energy and flux characteristics - Robert Michell
10:54 Where and how does auroral electron acceleration happen above Earth? -
Clare Watt, I. J. Rae, C. Forsyth, C. Anekallu and A. N. Fazakerley
11:06 Multi-instrument observation of simultaneous polar cap aurora occurring on open and closed field lines - Jade Reidy, R. C. Fear, D. K. Whiter, B. S. Lanchester, A. J. Kavanagh, L. J. Paxton, Y. Zhang and M. Lester
11:18 Comparing Large-Scale Auroral Morphologies of Magnetospheric Modes - Maria-Theresia, S. E. Milan, K. R. Murphy, J. A. Carter and B. A. Hubert
11:30 The UV aurora of Jupiter and its moons - under investigation by HST and the Juno mission - Lorenz Roth and the HST Juno Team
11:42 Stability within Jupiter's polar auroral 'Swirl Region' over moderate timescales - Tom Stallard, J. T. Clarke, H. Melin, S. Miller, J. D. Nichols, J. O'Donoghue, R. E. Johnson, J. E. P. Connerney, T. Satoh and M. Perry
11:54 Auroral precipitation energy as a function of the solar wind - Daniel Whiter, N. Partamies and K. Kauristie LUNCH 13:10 "SPIDER sounding rocket for multipoint study of auroral electrojet" -
Nickolay Ivchenko
13:34 All-sky optical-riometric imaging of aurorae - Derek McKay
13:46 Fine-scale auroral signatures of instability growth and boundary dynamics -
Hanna Dalhgren, B. S. Lanchester, N. Ivchenko, D. K. Whiter and R. Kataoka
13:58 Statistical Azimuthal Structuring of the Substorm Onset Arc: Implications for the Onset Mechanism - Nadine Kalmoni, , I.J. Rae, K. R. Murphy, C. Forsyth, C.E.J. Watt and C. J. Owen
14:10 Energy and spatial distribution of Jupiter's main auroral emission - Licia Ray, C. S. Arridge, J. Gustin and D. Grodent
14:22 Jupiter's X-ray Aurora During Juno Approach - Will Dunn, G. Branduardi-Raymont, C. M. Jackman, R. P. Kraft, L. C. Ray, R. F. Elsner, I. J. Rae, Z. Yao, M. F. Vogt and G. R. Gladstone
14:34 Inter-hemispheric asymmetries in Saturn's aurora - Sarah Badman, L. Lamy, R. Prangé, J.T. Clarke, P. Zarka, B. Cecconi, W. Kurth, D.G. Mitchell,W. Pryor, F. Crary, U. Duydina, E.J. Bunce, M. Burton, M.K. Dougherty, A. Radioti and J.D. Nichols 14:46 OPEN DISCUSSION ON MULTI-SCALE AURORAL DYNAMICS 15:30 EndPosters:
Generation of the Jovian Secondary Oval
AUTHORS: R L Gray, S V Badman, E E Woodfield, J D NicholsHow much flux does a flux transfer event transfer?
R. C. Fear, L. Trenchi, J. C. Coxon and S. E. Milan