Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa23b1483f&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA23B-1483
Physics
[0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2437] Ionosphere / Ionospheric Dynamics, [3369] Atmospheric Processes / Thermospheric Dynamics
Scientific paper
The effects of Joule heating on neutral wind, composition, temperature and density of the upper atmosphere are known qualitatively but a quantitative characterization is still missing. A step towards such a quantitative analysis requires detailed observations of the dynamics itself and its impacts on the thermosphere-ionosphere system, as well as an adequate numerical model. For this research we use the global, three-dimensional, time-dependent, non-linear coupled model of the thermosphere, ionosphere, plasmasphere and electrodynamics (CTIPe), a self-consistent physics-based model that solves the momentum, energy, and composition equations for the neutral and ionized atmosphere. The F10.7 index is used to define solar EUV heating, ionization, and dissociation. Propagating tidal modes are imposed at 80 km altitude with a prescribed amplitude and phase. The magnetospheric energy input into the system is characterized by the time variations of the solar wind velocity and the interplanetary magnetic field (IMF) magnitude and direction, whereas the auroral precipitation is derived either from the TIROS/NOAA satellite observations or from ACE solar wind and IMF data. During geomagnetic storms the temperature of the Earth’s upper atmosphere can be substantially increased mainly due to high-latitude Joule heating induced by magnetospheric convection and auroral particle precipitation. This heating drives rapid increases in temperature inducing upwelling of the neutral atmosphere. The enhanced density results in a subsequent increase of atmospheric drag on satellites and large-scale ionospheric storm effects. The storm energy input drives changes in global circulation, neutral composition, plasma density, and electrodynamics. One full year comparison between ground and space observations with CTIPe results during solar minimum conditions shows that the model captures the daily space weather and the year-long climatology not only in a qualitative but in a quantitative way. This opens the way for the use of the model to constrain the global magnetospheric energy input and for the establishment and analysis of driver-response relationships.
Codrescu Mihail
Fedrizzi Michele
Fuller-Rowell Tim J.
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