Plasma flux and gravity waves in the midlatitude ionosphere during the solar eclipse of 20 May 2012

摘要: The solar eclipse effects on the ionosphere are very complex. Except for ionization decay due to decrease of photochemical process, couplings matter and energy between regions above below will introduce much more disturbances. Five ionosondes in Northeast Asia were used record midlatitude ionospheric responses 20 May 2012. latitude dependence lag was studied first. foF2 response became slower with increased latitude. at different latitudes same obscuration differed from each other greatly. plasma flux protonsphere possibly produced by rapid temperature drop lunar shadow make up loss. greater downward generated higher larger dip angle delayed later. waves foEs frequency fixed height F layer time period analytic method. gravity 43–51 min center during after found over Jeju I-Cheon. northward group velocity component estimated as ~108.7 m/s. vertical velocities 100 150 km two stations calculated ~5 ~4.3 m/s upward respectively, indicating that eclipse-induced propagated ionosphere.