不同能谱沉降电子对极区电离层的影响

Effects of the precipitation electrons on the polar ionosphere with different energy spectrum

利用极区电离层自洽模型,考虑沉降电子引起的电离,计算了极区电离层的高度积分电导率和F层电子浓度,模拟了不同能谱分布的沉降电子对极区电离层的影响.研究发现不同能谱分布沉降电子对电离层电导率的影响不大,在能通量一定的情况下,平均能量是影响电导率大小的决定因素.而能谱对F层电子密度影响较大,随着平均能量的增加,能谱对电子浓度的影响越显著.在平均能量大于1 keV(甚至更低)时,修正的麦克斯韦分布谱能明显地增强F层电子浓度.

This paper calculated the height-integrated conductance and the electron density in the F-layer of the polar ionosphere, based on one self-consistent model of the polar ionosphere, which takes the ionization of the precipitation electrons with different energy spectrum into account. It is found that the energy spectrum of the electrons doesnt t have an obvious effect on the conductance. The average energy of the electrons is the determinant factor of the conductance. The relative magnitude of the conductance deduced using the different energy spectrum of the electrons also depends on the average energy. On the other hand, the electron density in the F- layer is well affected by the energy spectrum of the precipitation electrons. The larger the average energy of the precipitation is, the more notable the effect is.