Measurement of Solar Plasma Electric Fields

考虑到太阳等离子体电场在能量释放以及太阳大气中等离子体和高能粒子加速中的核心重要性，直接测量太阳等离子体电场受到的关注相对较少。该项目的目的是对这些电场进行地面测量，以验证基于太阳能氢线中横向斯塔克效应测量的有前途的电场遥感“电图”技术。到目前为止，目前的工作集中在萨克拉门托峰的NSO埃文斯设施的Mk I电图的开发和操作上，使用高Balmer和Paschen系列线。我们目前正在升级SPO仪器，将其灵敏度提高到1伏厘米-1。该项目将对这种灵敏度进行两次具体的观测试验，并每天对其进行操作，以观察耀斑、喷发细丝、太阳黑子和光斑。该项目还要求支持将这项技术进一步扩展到红外线，包括有前途的氢谱线，超过10。1992年后期，利用基特峰主麦克马斯光谱仪上新安装的红外光栅和新的国家天文台红外阵列，正在进行一些红外工作。这些研究结果将与耀斑的放电和重联模型、耀斑后循环模型、灯丝喷发模型以及最近关于太阳丰度变化的观点进行比较。#

Direct measurement of solar plasma electric fields has received relatively little attention considering the central importance of such fields in energy release, and in plasma and energetic particle acceleration in the solar atmosphere. This project's aim is to carry out ground-based measurements of such fields to validate the promising "electrograph" technique of electric field remote sensing based on measurement of the transverse Stark effect in solar hydrogen lines. Present work so far has centered on development and operation of a Mk I electrography at the NSO Evans Facility at Sacramento Peak, using the high Balmer and Paschen series lines. We are presently upgrading the SPO instrument to increase its sensitivity to 1 volt cm-1. This project will carry out two specific observational tests of this sensitivity, and to operate it on a daily basis to with flares, eruptive filaments, sunspots and faculae. The project will also requests support to extend this technique farther into the infrared, to include promising hydrogen lines out to beyond 10 . Some of this IR work is getting underway in late 1992, using the newly installed IR grating in the main McMath spectrograph at Kitt Peak, and the new NSO IR array. The results of these investigations will be compared to the discharge and reconnection models of flares, to models of post-flare loops, filament eruptions, and also to recent ideas on solar abundance variations. #