Matthias Förster
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Matthias Förster GFZ German Research Centre for Geosciences, Helmholtz Centre Potsdam, Telegrafenberg, D-14473 Potsdam, Germany, mfo @ gfz-potsdam.de. Dynamics and meso-scale structures at high-latitudes due to M-I-T coupling processes : modelling & data analyses. Summary:

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Matthias Förster

GFZ German Research Centre for Geosciences, Helmholtz Centre Potsdam,

Telegrafenberg, D-14473 Potsdam, Germany, mfo @ gfz-potsdam.de

Dynamics and meso-scale structures

at high-latitudes due to M-I-T coupling

processes : modelling & data analyses

Summary:

The coupling between the ionized layers of the upper atmosphere and the thermospheric neutral gas takes place via ion drag force and is mediated through magnetic field changes and both field-aligned (FAC) and ionospheric currents. Thus we talk about a coupled Magnetosphere-Ionosphere-Thermosphere (M-I-T) system. This electrodynamic system is driven by processes of momentum and energy transfer, mainly reconnection, between the highly variable solar wind and the interplanetary magnetic field (IMF) with the magnetosphere and by inner-magnetospheric plasma processes. The ionospheric conditions affect likewise the magnetospheric state. These processes are particularly important at high latitudes, but have inherently global impacts, notably for disturbance periods. They constitute a vital driving force for the transpolar thermospheric wind and thus to the global circulation and the worldwide energy budget.

DFG – SPP 1788 Dynamic Earth Workshop GFZ Potsdam 03-04 July 2014



Cluster/EDI Average Convection Pattern July 2014

DFG – SPP 1788 Dynamic Earth Workshop GFZ Potsdam 03-04 July 2014


Cluster/EDI Average Convection Pattern July 2014

DFG – SPP 1788 Dynamic Earth Workshop GFZ Potsdam 03-04 July 2014


Neutral Wind Vorticity vs. IMF orientation July 2014

DFG – SPP 1788 Dynamic Earth Workshop GFZ Potsdam 03-04 July 2014


Neutral Wind Vorticity vs. IMF orientation July 2014

DFG – SPP 1788 Dynamic Earth Workshop GFZ Potsdam 03-04 July 2014


Vorticity of Wind Vector Distribution July 2014

CHAMP accelerometer 01 Jan 2002 - 31 Dec 2003

North Hemisphere South Hemisphere

Iijima and Potemra (JGR, Vol. 81, No. 34, 5971-5979, 1976, Fig. 6 ) , obtained from TRIAD vector magnetometer data

See: Förster, M., Haaland, S. E., and Doornbos, E. (2011): Thermospheric vorticity at high geomagnetic latitudes from CHAMP data and its IMF dependence. Annales Geophysicae, 29, 1, 181-186.

DFG – SPP 1788 Dynamic Earth Workshop GFZ Potsdam 03-04 July 2014


Event study : IMF disturbance period of 28 October 2003 July 2014

X17 Solar Flare

Preceding Halloween Storm of 29-30 Oct

DFG – SPP 1788 Dynamic Earth Workshop GFZ Potsdam 03-04 July 2014


Neutral Wind (m/s) @ South Pole: Model & Observation July 2014

Upper Atmosphere Model (UAM)

DFG – SPP 1788 Dynamic Earth Workshop GFZ Potsdam 03-04 July 2014


Neutral wind m s @ south pole model observation
Neutral Wind (m/s) @ South Pole: Model & Observation July 2014

See:

Namgaladze, A.A., Förster, M., Prokhorov, B.E., and Zolotov, O.V. (2013), “Electromagnetic Drivers in the Upper Atmosphere: Observations and Modeling”. In: Bychkov, V. Golubkov, G., Nikitin, A. (Eds.), The Atmosphere and Ionosphere Elementary Processes, Discharges and Plasmoids, Springer, pp. 165-219.

Upper Atmosphere Model (UAM)

DFG – SPP 1788 Dynamic Earth Workshop GFZ Potsdam 03-04 July 2014


Open Questions & Objectives July 2014

  • What is the nature of North-South asymmetries of the M-I-T system?

    (see, e.g. : Förster, M. and Cnossen, I. (2013), “Upper atmosphere differences between northern and southern highlatitudes: the role of magnetic field asymmetry”,

    Journal of Geophysical Research, vol. 118, issue 9, pp. 5951-5966)

  • Which consequences do result from this asymmetry for the global behaviour?

  • What are the concrete M-I-T interaction scenarios in meso-scales?

  • The Swarm-S/C provide observations for several important parameters for

    these processes: Ion drift, Plasma density and temperatures, Neutral density

    and neutral (cross-track) wind, FAC.

  • Numerical first-principle simulation appears to be a necessary tool for the

    physical understanding of these complex processes.

  • Need: Comprehensive data analysis & Further development of model tools.

    (one experienced scientist plus one PhD student ?)

DFG – SPP 1788 Dynamic Earth Workshop GFZ Potsdam 03-04 July 2014


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