Numerical simulation about the influence of different initial disturbance on the ionosphere spread-F

The triggering role of different factors like gravity wave, neutral wind, and electric field in the formation of ionosphere spread-F is a hot issue. Based on a physical model which is developed to present the development of ionosphere spread-F., the reliability of this model is firstly proved by analysis of the effects of eastward electric field and background wind field on spread-F and comparison with experience. Then, on a given background, the spread-F triggered by three disturbances of the initial electron density of different scale is simulated in this paper. The possibility of causing a certain scale perturbation and triggering spread-F by chemical release is also demonstrated. The results show that strong electric-field intensity and eastward neutral wind are beneficial to the development of spread-F, proving that the physical model is reliable; there is an inflection point of the uplift rate of spread-F in the development process, after which spread-F is triggered and developed, and the electron density disturbances with short wavelength are much more beneficial to the triggering and development of spread-F than that of long wavelength; chemical H2O can produce localized electron density depletion effectively, and it can form a certain scale initial disturbance of electron density for triggering spread-F in the ionosphere, indicating that chemical release could be used as a way to trigger spread-F artificially.