Impact of electron thermal effects on Farley-Buneman waves at arbitrary aspect angles

Details Impact of electron thermal effects on Farley-Buneman waves at arbitrary aspect angles Impact of electron thermal effects on Farley-Buneman waves at arbitrary aspect angles

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10912302k&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue A12, CiteID A12302

Physics

Plasma Physics

11

Ionosphere: Equatorial Ionosphere, Ionosphere: Ionospheric Irregularities, Ionosphere: Plasma Waves And Instabilities, Space Plasma Physics: Kinetic And Mhd Theory, Space Plasma Physics: Waves And Instabilities

Scientific paper

Using a standard 8-moment expansion of the fluid equations, we have extended fluid calculations of the effect of electron temperature feedback on the linear Farley-Buneman instability theory to include the contribution of field-aligned heat flow and field-aligned wave electric fields through nonzero-aspect angles. Our treatment includes arbitrary ion magnetization and neutral winds but is limited, for simplicity, to zero flow angles. Our results indicate that, for 3-m waves, electron thermal corrections are significant (threshold phase velocities greater than predicted by isothermal theory by 20% or more) at aspect angles less than 0.35° for altitudes less than 103 km. Similar but smaller numbers are obtained for 10-m waves. The impact of the thermal corrections normally also decreases rapidly with increasing altitude. These results provide a straightforward explanation for equatorial observations of 3-m phase velocities that are at least 30% greater than the isothermal ion-acoustic speed below 105 km in the equatorial regions. The altitude dependence of the observed phase speeds also mimics very well the behavior seen in our calculations. The implication is that the aspect angles of the structures must be smaller than 0.3°. This is consistent with recent findings from radar interferometry.

Affiliated with

Also associated with

No associations

Rating

Impact of electron thermal effects on Farley-Buneman waves at arbitrary aspect angles does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Impact of electron thermal effects on Farley-Buneman waves at arbitrary aspect angles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impact of electron thermal effects on Farley-Buneman waves at arbitrary aspect angles will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1085889