25 research outputs found
Noon ionospheric signatures of a sudden commencement following a solar wind pressure pulse
Using experimental data
from the Cutlass Super-DARN HF radars and from a subset of ground magnetometers
of the IMAGE Scandinavian chain, the response of the ionosphere in the noon
sector to a solar wind pressure increase is studied. The emphasis is on the
signature of the convection vortices and of the Hall currents that are
associated with the pair of opposite parallel currents flowing along the
morning and afternoon high-latitude magnetic field lines. We show that the
sudden commencement is characterised by an equatorward convection, immediately
followed (within less than 3 min) by a strong poleward plasma motion. These
results are shown to agree qualitatively with the global model of sudden
commencement of Araki (1994).Key words. Ionosphere (plasma
convection; electric fields and currents) – Magnetospheric physics (solar
wind-magnetosphere interactions
Noon ionospheric signatures of a sudden commencement following a solar wind pressure pulse
International audienceUsing experimental data from the Cutlass Super-DARN HF radars and from a subset of ground magnetometers of the IMAGE Scandinavian chain, the response of the ionosphere in the noon sector to a solar wind pressure increase is studied. The emphasis is on the signature of the convection vortices and of the Hall currents that are associated with the pair of opposite parallel currents flowing along the morning and afternoon high-latitude magnetic field lines. We show that the sudden commencement is characterised by an equatorward convection, immediately followed (within less than 3 min) by a strong poleward plasma motion. These results are shown to agree qualitatively with the global model of sudden commencement of Araki (1994)
Dynamics of Dayside Magnetospheric Boundaries During An Imf Bz Transition: A Ground and Satellite Study
International audienc
Dynamics of Dayside Magnetospheric Boundaries During An Imf Bz Transition: A Ground and Satellite Study
International audienc
Dynamics of Dayside Magnetospheric Boundaries During An Imf Bz Transition: A Ground and Satellite Study
International audienc
Simultaneous Observations of The Signature of Flux Transfer Events In The Ionosphere By Radars and In The Magnetosphere By Cluster
International audienc