Wave Normal Angles of Magnetospheric Chorus Emissions Observed on the Polar Spacecraft

Details Wave Normal Angles of Magnetospheric Chorus Emissions Observed on the Polar Spacecraft Wave Normal Angles of Magnetospheric Chorus Emissions Observed on the Polar Spacecraft

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23a1579h&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM23A-1579

Physics

Plasma Physics

[2730] Magnetospheric Physics / Magnetosphere: Inner, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [6984] Radio Science / Waves In Plasma, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Using data from the High Frequency Waveform Receiver onboard the Polar spacecraft, 1,765 and 993 wave normal angles have been analyzed for 13 orbits containing upper band magnetospheric chorus emissions and 15 orbits containing lower band emissions, respectively. The purpose of this study is to characterize the distribution of the polar wave normal angle, θ, for chorus emissions as a function of magnetic latitude, λ. Understanding wave normal angles is an important step in evaluating resonant wave-particle interactions. For upper band chorus, wave normal angles tend to remain at or rise towards the resonance cone angle for low and mid-latitudes, but move away from the resonance cone angle at higher latitudes. For lower band chorus, wave normal angles with values θ<20ο have the highest probability of occurrence in the latitude range of 10o-50o. Just off the equator, 10o≤λ<25o, there exists a secondary occurrence peak in the range of 50o≤θ<70o. The probability of observing these higher wave normal angles decreases with increasing latitude. The time averaged Poynting flux, S, is much larger for lower band chorus waves, which have a mean value of 8.5×10-8 W/m2, than for upper band chorus waves, which have a mean value of 1.4×10-9 W/m2. S is fairly evenly distributed about its median value, 3.1×10-10 W/m2, for all wave normal angles for upper band chorus, but deceases as θ increases for lower band chorus. Probability of occurrence for wave normal angles, θ, divided in 10o intervals, normalized with respect to each magnetic latitude, λ, region for (a) upper band chorus emissions and (b) lower band chorus emissions. The value of the wave normal angle is indicated by the gray scale coloring.

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