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Mhd modeling of coronal loops: the transition region throat
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Guarrasi, M. Orlando, S. Mignone, A. Klimchuk, J. A. Reale, F. |
| Copyright Year | 2014 |
| Description | Context. The expansion of coronal loops in the transition region may considerably influence the diagnostics of the plasma emission measure. The cross-sectional area of the loops is expected to depend on the temperature and pressure, and might be sensitive to the heating rate. Aims. The approach here is to study the area response to slow changes in the coronal heating rate, and check the current interpretation in terms of steady heating models. Methods. We study the area response with a time-dependent 2D magnetohydrodynamic (MHD) loop model, including the description of the expanding magnetic field, coronal heating and losses by thermal conduction, and radiation from optically thin plasma. We run a simulation for a loop 50 Mm long and quasi-statically heated to about 4 millikelvin. Results. We find that the area can change substantially with the quasi-steady heating rate, e.g., by approx. 40% at 0.5 millikelvin as the loop temperature varies between 1 millikelvin and 4 millikelvin, and, therefore, affects the interpretation of the differential emission measure vs. temperature (DEM(T)) curves. |
| File Size | 1743443 |
| Page Count | 7 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150007701 |
| Archival Resource Key | ark:/13960/t6n064w79 |
| Language | English |
| Publisher Date | 2014-04-04 |
| Access Restriction | Open |
| Subject Keyword | Magnetohydrodynamics (mhd) Sun: Corona Sun: Magnetic Fields Sun: Transition Region Solar Corona Magnetohydrodynamics Coronal Loops Solar Simulation Coronas Algorithms Heating Solar Transition Region Models Thermal Analysis Plasma Temperature Solar Magnetic Field Cylindrical Coordinates Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
