Simulating plasmaspheric field-aligned density profiles measured with IMAGE/RPI: Effects of plasmasphere refilling and ion heating
Simulating plasmaspheric field-aligned density profiles measured with IMAGE/RPI: Effects of plasmasphere refilling and ion heating
复制标题
模拟使用 IMAGE/RPI 测量的等离子层场对准密度分布：等离子层再填充和离子加热的影响
DOI：
10.1029/2002ja009468
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发表时间：
2003
影响因子：
--
通讯作者：
P. Richards
中科院分区：
文献类型：
--
作者：
J. Tu;J. Horwitz;P. Song;Xueqin Huang;B. Reinisch;P. Richards
[1]IMAGE卫星上的无线电等离子体成像仪通过无线电探测技术测量沿着磁力线的电子密度分布。我们模拟了三个密度剖面测量的RPI在2001年6月8日使用场线半球间等离子体（FLIP）模型和比较建模的密度剖面与观测到的剖面。虽然仔细考虑耗尽通量管，然后再填充几天，允许公平的协议之间的模拟和测量的密度在赤道附近，模拟的密度在离赤道地区仍然显着低于所有模拟通量管测量。结果表明，直接加热的离子在plasmasmaspheric在plasmaspheric再填充过程中，除了通过库仑碰撞与较热的等离子体层电子加热，可以提高协议在赤道以外的地区。由于离子加热导致的磁场线高空部分离子压的增强阻碍了电离层从两半球向赤道的流入，导致电离层离子向赤道地区的输运减少，从而增加了沿磁场线的沿着密度梯度。
[1] The radio plasma imager (RPI) on board the IMAGE satellite measures electron density profiles along magnetic lines through radio sounding techniques. We simulate three density profiles measured by the RPI on 8 June 2001 using the field line interhemispheric plasma (FLIP) model and compare the modeled density profiles with observed profiles. While careful consideration of depletion of flux tubes followed by refilling over several days allows fair agreement between simulated and measured densities around the equator, the simulated densities in the off-equator regions remain significantly lower than those measured for all simulated flux tubes. It is shown that direct heating of ions in the plasmasphere during the plasmasphere refilling, in addition to heating through Coulomb collisions with hotter plasmaspheric electrons, can improve the agreement in the off-equator regions. The enhanced ion pressure in the high altitude part of magnetic field line due to the ion heating impedes the ionospheric inflow from both hemispheres toward the equator, giving rise to decreased transport of ionospheric ions into the equatorial region and thus increased density gradient along the magnetic field line.