Eclipse Observations with the Caltech Submillimeter Observatory

无线电波长测量是从地面研究太阳大气的唯一方法之一。本研究将利用加州理工学院亚毫米天文台观测1991年7月日食时的翼亮、色球和日冕。这些测量将确定在1毫米波长处观测到的太阳的大小，在亚毫米范围内的热辐射源，并且将在色球层和日冕中搜索各种光谱特征。这些测量将使人们能够确定太阳低层大气的温度结构，并将显示太阳上不同区域（如细丝和太阳黑子）之间的温度差异。光谱特征，如重组线，如果被发现，将提供有关日冕和色球层中物质速度的信息。还应获得这些地区化学物质丰度的一些资料。首席研究员是观测太阳物理和仪器方面的专家。

Measurement at radio wavelengths is one of the only ways of studying the solar atmosphere from the ground. This research will observe limb brightening, the chromosphere and corona at the eclipse of July 1991 with the Caltech Submillimeter Observatory. These measurements will determine the size of the Sun as observed at a wavelength of 1 millimeter, the sources of thermal emission in the submillimeter range, and there will be a search for a variety of spectral features in both the chromosphere and the corona. These measurements will allow one to determine the temperature structure of the low solar atmosphere and will show temperature differences between different regions on the Sun such as filaments and sunspots. Spectral features such as recombination lines, if found, should give information on the velocity of matter in the corona and the chromosphere. Some information on chemical abundances in these regions should also be obtained. The Principal Investigator is an expert in observational solar physics and instrumentation.