An emission measure analysis of two sunspots observed by the UVSP instrument on the SMM spacecraft |
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| Authors: | A E Kingston J G Doyle P L Dufton J B Gurman |
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| Institution: | (1) Department of Applied Mathematics and Theoretical Physics, The Queen's University of Belfast, BT7 1NN Belfast, Northern Ireland;(2) Department of Pure and Applied Physics, The Queen's University of Belfast, Belfast, Northern Ireland;(3) UVSP/Applied Research Corporation, USA |
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| Abstract: | The EUV observations from the SMM satellite of two sunspots are presented here. These observations show the sunspots (a) to be regions of lower intensity than the surrounding plage, contrary to that found by previous authors, and (b) to have line intensities which vary little over a period of several hours. An upper limit to mass flows of 2km s-1 is derived, indicating a relatively simple energy balance for the chromosphere-corona transition zone with thermal conduction being balanced by radiative losses. Electron densities derived from Niv to Civ line ratios imply electron pressures (log N
eTe) of 15.0 to 15.3. |
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