电场产生的赤道扩展F的时空演变

利用计算机模拟研究了非均匀电场产生的赤道扩展Ｆ的时空演变。非均匀电场能在赤道电离层Ｆ区底部触发Ｒａｙｌｅｉｇｈ－Ｔａｙｌｏｒ不稳定性，导致等离子体泡形态。计算中非均匀电场的幅度取为０．２５－１．００ｍＶ／ｍ，所产生的等离子体泡在２０００ｓ以内就能穿过Ｆ峰达到５４０ｋｍ的高度。所得结果阐明了非均匀电场在赤道扩展Ｆ中的作用，指出了产生等离子体泡一种可能的扰动源。由于Ｅ区和Ｆ区电场是相互影响的，从而揭示了Ｅ区和Ｆ区扰动的相互联系。

SPATIAL AND TEMPORAL EVOLUTION OF EQUATORIAL SPREAD F GENERATED BY ELECTRIC FIELDS

We have used a computer simulation to study spatial and temporal evolution of equatorial spread F irregularities generated by irregular electric fields.It is shown that irregular electric fields can initiate the Rayleigh-Taylor instability in the bottomside F region and result in topside plasma bubbles.The amplitude of the electric fields used in the simulations is 0.25-1.00 mV/m, and resulting plasma bubbles penetrate the F peak and reach the altitude of 540 km within 2000 s.It is found that irregular electric fields can play an important role in equatorial spread F and are a possible perturbation source for generation of plasma bubbles.Since the E region electric fields can map upto the F region along the magnetic field lines,the numerical results reveal possible interrelation between E and F region perturbations.