Striation eigenmodes along the geomagnetic field and eigenvalues in the limit of strong ion-neutral collisions

Details Striation eigenmodes along the geomagnetic field and eigenvalues in the limit of strong ion-neutral collisions Striation eigenmodes along the geomagnetic field and eigenvalues in the limit of strong ion-neutral collisions

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.2819s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, March 1, 1985, p. 2819-2841. Research supported by the U.S. Defense N

Physics

12

Geomagnetism, Magnetospheric Electron Density, Magnetospheric Instability, Particle Collisions, Differential Equations, Eigenvalues, Linear Equations, Striation

Scientific paper

A second-order linear differential equation is derived for determining the linear eigenmodes of striation instabilities along the geomagnetic field. Eigenvalues (i.e., temporal frequencies in complex space) are determined along with the eigenmodes. The differential equation includes the contribution of two significant physical effects, ion polarization currents and inductive electric fields. The numerical evaluation of the differential equation emphasizes the collisional limit appropriate to situations when the instabilities are driven at altitudes where the ion-neutral collision frequency is much larger than the growth rate for the instability. The numerical results indicate that the instabilities can drive parallel electron currents in the magnetosphere. However, because of finite parallel resistivity, magnetic field lines generally cannot be considered to be equipotentials. It is suggested that the coefficient for ion diffusion resulting from ion-neutral collisions plays an important role in determining the maximum perpendicular wave number for which bifurcation is possible. The coefficient for ion-neutral diffusion results in a qualitatively and quantitatively meaningful diffusivity for application to the 'U-shaped' curve description of striation evolution.

Affiliated with

Also associated with

No associations

Rating

Striation eigenmodes along the geomagnetic field and eigenvalues in the limit of strong ion-neutral collisions 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 Striation eigenmodes along the geomagnetic field and eigenvalues in the limit of strong ion-neutral collisions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Striation eigenmodes along the geomagnetic field and eigenvalues in the limit of strong ion-neutral collisions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-823629