Modeling the Altitude Range of Instabilities in Meteor Trails in the E-Region Ionosphere

Details Modeling the Altitude Range of Instabilities in Meteor Trails in the E-Region Ionosphere Modeling the Altitude Range of Instabilities in Meteor Trails in the E-Region Ionosphere

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa41a..22r&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SA41A-22

Physics

2471 Plasma Waves And Instabilities, 6245 Meteors, 6952 Radar Atmospheric Physics

Scientific paper

Large aperture radars frequently detect meteors and meteor trails in the lower ionosphere between 80 - 130km. Plasma simulations and analyses show that Farley-Buneman gradient-drift (FBGD) instabilities create field aligned irregularities (FAI) within these trails over a limited range of altitudes. These irregularities cause the generation of non-specular meteor trail radar echoes. This paper presents a model which predicts the altitude range where one expects FAI to occur. The model begins with a meteroid of a given initial mass and velocity, and then applies an ablation and ionization model to calculate the line density of the plasma column created. It then determines the trail's initial radius, which is roughly the mean free path length. Assuming this trail has a gaussian density profile, it calculates the gradient length scale of the plasma column. This informations allows the application of the kinetic FBGD dispersion relation to determine at which altitudes field-aligned irregularities will grow. This predicted altitude range coincides with radar-intensity-plots of observed non-specular echoes from several radar facilities.

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