ASTROPHYSICS AND SPACE PLASMA: 16-Moment Approximation for Ion Velocity Distribution and its Application in Calculations of Incoherent Scatter Spectra

Details ASTROPHYSICS AND SPACE PLASMA: 16-Moment Approximation for Ion Velocity Distribution and its Application in Calculations of Incoherent Scatter Spectra ASTROPHYSICS AND SPACE PLASMA: 16-Moment Approximation for Ion Velocity Distribution and its Application in Calculations of Incoherent Scatter Spectra

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009plst...11..152x&link_type=abstract

Plasma Science and Technology, Volume 11, Issue 2, pp. 152-158 (2009).

Physics

Scientific paper

A sixteen moment approximation based on a bi-Maxwellian that contains the stress tensor and the heat flow vector is applied to describe the ion velocity distribution which influences the incoherent scatter spectra. A discussion is made about the effects on the incoherent scatter spectra caused by different values of the normalized perpendicular drift velocity D, aspect angle phi between the magnetic field and the line-of-sight direction, and the ratio α of the ion-neutral collision to ion cyclotron frequency. Numerical results show that the shifting and asymmetry of incoherent scatter spectra appear parallel to E × B and E as the normalized perpendicular drift velocity D increases due to the ion drift velocity, the stress tensor and the heat flow vector respectively. However, the spectrum is always typically double-humped Maxwellian parallel to B. The ion velocity distribution is more distorted from the Maxwellian as the aspect angle phi increases from 0° to 90°, and consequently the incoherent scatter spectra is no longer typically double-humped Maxwellian. As α increases, the ion velocity distribution becomes Maxwellian and the incoherent scatter spectra become typically double-humped Maxwellian even with a large value of the normalized perpendicular drift velocity D. It is reasonable to use the sixteen-moment approximation to describe the non-Maxwellian plasma characterized by the large temperature anisotropy.

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