TEMPORAL AND SPATIAL VARIATIONS OF PLASMA AND NEUTRAL VELOCITIES DURING SUBSTORM PERIODS. Issue 4 (July 2016)

• Record Type: Journal Article
• Authors: Ding‐Wei, LIU; Hui, WANG; Tao, HUANG; Xue, CAO; Ke‐Deng, ZHANG
• Is Part Of: Chinese journal of geophysics. Volume 59:Issue 4(2016:Jul.)
• Page Start: 395
• Page End: 403
• Publication Date: 2016-07
• Subjects: Substorms -- Plasma convection -- Thermospheric zonal wind -- Time delay; Geophysics -- Periodicals; 550.5
• DOI: 10.1002/cjg2.20244
• Languages: English
• ISSNs: 2326-0440

Abstract

Abstract: This study statistically investigates the temporal and spatial variations of plasma convection velocity ( V y ) and thermospheric zonal wind velocity ( U y ) in the range of –4 hour (h) and +2 h MLT relative to substorm onsets (MLT onset) with both CHAMP and DMSP (F13, F15) satellites observations from 2001 to 2005. It shows that V y increase significantly in all MLT sectors and the latitudes of the peak values move equatorward in 1.5 h after substorm onsets. In the subsequent 1.5 h V y decrease in intensity and the peaks retreat poleward, which shows that the onsets of substorm can enhance the plasma convection velocity dramatically. The relative increase of V y is largest from –2 h to MLT onset, which indicates that the substorm mainly affects the thermosphere in the westward 0∼2 h MLT sector. U y increases steadily in 3 hours after substorm onsets, with a 1.5 h delay relative to V y in response to the substorm onsets.