Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm33a..10l&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM33A-10
Other
7954 Magnetic Storms (2788), 2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2431 Ionosphere/Magnetosphere Interactions (2736), 2463 Plasma Convection (2760)
Scientific paper
Measurements of electric fields and plasma flows in the magnetosphere and ionosphere show often the irregular, turbulent character of the convection flow. To exclude the effect of substorms and other events in the nightside ionosphere, which are associated with variations of ionospheric conductivity, we investigated dayside ionospheric convection. For this purpose, we took for the analysis the geomagnetic variations from high- latitude observatories, when they were located at the dayside and showed ionospheric currents, related to dayside ionospheric convection. Additionally, we used for the analysis a special geomagnetic activity index, measuring dayside ionospheric convection. For this analysis we used 15-min and hourly mean values of magnetic data and solar wind parameters for several years. Our analysis showed that the dayside magnetic field variations show statistically good correlation with solar wind coupling function and may be used for monitoring dayside ionospheric convection, driven by solar wind electric field. However, this analysis also showed the existence of a sharp transition between the quasi-laminar and turbulent ionospheric convection flow. Similar to the flow in a gas and liquid, the ionospheric convection becomes turbulent for strong convection flows and large values of the coupling function. A large spread in measured magnetic field values appears beginning from some value of the coupling function. This effect is seen in all data for all years. It shows that the ionospheric convection for large values of the solar wind coupling function has usually not laminar but turbulent regime. This allows us to understand the cause for a significant spread in correlation of measured convection flows and geomagnetic activity indices with solar wind coupling function. It may be also important for better understanding of many events in the ionosphere and magnetosphere, including the well-known saturation effect in the solar wind-magnetosphere coupling, since in the turbulent regime a significant portion of solar wind energy is spent on the generation of turbulent eddies.
Lyatsky Wladislav
Tan Aihong
No associations
LandOfFree
Laminar-Turbulent Transition in Dayside Ionospheric Convection does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Laminar-Turbulent Transition in Dayside Ionospheric Convection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laminar-Turbulent Transition in Dayside Ionospheric Convection will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1027277