- Title
- A numerical model of the ionospheric signatures of time-varying magnetic reconnection: III. Quasi-instantaneous convection responses in the Cowley-Lockwood paradigm
- Creator
- Morley, S. K.; Lockwood, M.
- Relation
- Annales Geophysicae Vol. 24, Issue 3, p. 961-972
- Relation
- www.ann-geophys.net/24/961/2006/
- Publisher
- Copernicus GmbH
- Resource Type
- journal article
- Date
- 2006
- Description
- C1
- Description
- Using a numerical implementation of the cowlock92 model of flow excitation in the magnetosphere-ionosphere (MI) system, we show that both an expanding (on a ~12-min timescale) and a quasi-instantaneous response in ionospheric convection to the onset of magnetopause reconnection can be accommodated by the Cowley-Lockwood conceptual framework. This model has a key feature of time dependence, necessarily considering the history of the coupled MI system. We show that a residual flow, driven by prior magnetopause reconnection, can produce a quasi-instantaneous global ionospheric convection response; perturbations from an equilibrium state may also be present from tail reconnection, which will superpose constructively to give a similar effect. On the other hand, when the MI system is relatively free of pre-existing flow, we can most clearly see the expanding nature of the response. As the open-closed field line boundary will frequently be in motion from such prior reconnection (both at the dayside magnetopause and in the cross-tail current sheet), it is expected that there will usually be some level of combined response to dayside reconnection.
- Subject
- ionosphere; magnetospheric physics
- Identifier
- http://hdl.handle.net/1959.13/26891
- Identifier
- uon:1191
- Identifier
- ISSN:0992-7689
- Language
- eng
- Full Text
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