The dependence of Joule heating on electric field scale size*

Details The dependence of Joule heating on electric field scale size* The dependence of Joule heating on electric field scale size*

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm42a06w&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM42A-06

Physics

2407 Auroral Ionosphere (2704), 2467 Plasma Temperature And Density, 7831 Laboratory Studies

Scientific paper

Since Joule heating is often regarded as an important mechanism which contributes to energization of outflowing heavy ions observed by high altitude auroral satellites, the understanding of this mechanism in structured electric field environments is important. In earlier laboratory studies, ion cyclotron waves driven by localized transverse dc electric fields were demonstrated to produce significant levels of ion heating. With sufficient increase in neutral pressure however, the dominant ion energization shifts to Joule heating induced by ion-neutral collisions occurring in the transverse electric field, E. Also, since transverse-to-B ionospheric electric fields are often spatially structured, even as small as a few ion gyroradii, the ability to systematically vary the spatial extent, magnitude, and direction of the electric field region and to observe the effect on ion energy is important. The experiment employs a set of concentric ring anodes (which are separately biasable) to produce the radial transverse electric field with controllable scale length and direction, perpendicular to an ambient magnetic field.1 We will present a new data compilation which demonstrates more fully the range of electric fields and scale lengths possible in these experiments. In addition we will demonstrate how the level of Joule heating changes with the scale size of the electric field. The dependence of ion temperature on both the scale size and the electric field will emerge by separately holding electric field strength and scale length constant. *Work supported by ONR; 1J. Geophys. Res., 106, 1807, 2001

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