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[2011-05-31]: A Large Refracting Coronagraph to Measure Solar Coronal Magnetic Fields
2011-05-24  |  作者:  |  【  】 【打印】 【关闭

报告人:  Prof. Steven Tomczyk

单位:   High Altitude Observatory/NCAR,USA

报告日期: 2011-05-31(星期二)

报告时间: 9:00

地点:    主楼四楼会议室

邀请团队: 抚仙湖太阳基地 & 太阳活动和CME理论研究组

摘要:   Advances in many fundamental problems in coronal physics such as the heating of the corona, and the storage and release of magnetic free energy, require the measurement of the strength and direction of coronal magnetic fields. Some progress has been made in recent years through observation of the Zeeman effect of forbidden IR coronal emission lines, but these efforts are hindered by the small apertures of available coronagraphs. Ideally, one requires a coronagraph with an objective of at least 1.5 meters, a very low level of scattered light, and a large field-of-view. These requirements are best met by a coronagraph with a singlet lens objective. In this talk, I will outline the rationale for coronal magnetic field measurements, review recent progress in the field, and present the results of engineering studies which show that a refracting telescope of this size is feasible with current technology. I will conclude with a description for the proposed Coronal Solar Magnetism Observatory (COSMO) which is a facility dedicated to the synoptic observation of coronal magnetism.

 
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