Experimental Study On The Variation Of Vertical Induction Magnetic Field Intensity In Rain,Snow,Dust And Haze Weather

With the continuous improvement of the study of particle electrification,Particles such as volcanic ash,rain,snow and dust have all been proved to be electrified.In the process of atmospheric transport,The moving charge will not only cause the change of electric field,but also stimulate the change of magnetic field.therefore,the simultaneous observations of vertical inductive magnetic field intensity,three-dimensional electric field,ambient temperature,relative humidity and mass concentration(PM₁₀)were performed at Lanzhou and Xi'an,China from November 2017 to March 2019,and obtained real-time observations of multiple sets of rain,snow,dust and haze weather.Through the selecting and preprocessing of real-time observation data,the variation of vertical magnetic induction intensity in these special weathers is analyzed,and the possible factors that cause the vertical magnetic induction intensity change under special weather are obtained.The consequences of this thesis show that there are obvious changes in the vertical magnetic induction intensity?B_z?in rainfall,snowfall and dusty weather:1)B_z increases compared with fair weather during rainfall;2)B_z decreases compared with fair weather during snowfall 3)B_z has increased and decreased compared to the fair weather in dusty weather.On the contrary,the change of B_z in the haze weather is not obvious compared to the fair weather,but there is an electric field with the intensity of several thousand volts per meter in the space.The average wind speed can reach 4-5m/s in rainfall,snowfall and dust weather,while the wind speed in haze weather is less than 2m/s.The results of the above studies indicate that raindrops,snow,dust and haze particles are charged particles,and the change of environmental vertical magnetic induction intensity is caused by the approximate circular motion of these charged particles in the horizontal plane or the linear motion in the horizontal plane.The difference in the trend of vertical magnetic induction in different weathers due to the different electrode polarity of these charged particles.The reason why the vertical magnetic induction intensity of the haze event does not change significantly owing to the fact that the haze particles move at a lower speed in the horizontal plane.The research results of this thesis provide a basis for the calibration of instruments based on environmental magnetic field detection,and have important significance for understanding the vertical magnetic induction intensity under different special weather conditions.