Measurement of Solar Plasma Electric Fields

太阳等离子体电场的测量

• 批准号: 9121303
• 负责人: Peter Foukal
• 金额: --
• 依托单位: Cambridge Research & Instrumentation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-05-15 至 1993-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9121303&HistoricalAwards=false
• 关键词: Measurement; Solar; Plasma; Electric; Fields

This proposal is to observe solar electric fields. Solar plasma electric fields have 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 proposal is to carry out ground-based measurements of such fields to validate the promising "electrograph" technique of electric field remote sensing. This is based on measurement of the transverse Stark effect in solar hydrogen lines. The PI plans to upgrade the SPO instrument to increase its sensitivity to 1 volt cm1, and test this sensitivity by observing the motional electric field (due to random cross-B particle motions in any magnetized plasma) which should become detectable in the sunspot chromosphere at this sensitivity level. More broadly, they plan to operate the electrograph on a daily basis to study the intensity, geometry, and spatial and time behavior of electric fields associated with flares, eruptive filaments, sunspots and faculae. They also plan to extend the electrograph technique farther into the infrared, to include promising hydrogen lines out to beyond 10 . This IR work will be carried out with the FTS and with the main McMath spectrograph at Kitt Peak. The results of thes 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. They experience in these ground- based observations will be also used to determine the optimum wavelengths of electrograph operation in the infrared, and to investigate whether important advantages in electric field measurements on the disc and at the limb might be achieved with an electrograph flown on a balloon, on the Shuttle or on a satellite.

这项建议是为了观测太阳电场。考虑到太阳等离子体电场在能量释放、太阳大气中的等离子体和高能粒子加速中的核心重要性，太阳等离子体电场受到的关注相对较少。这项提议是对这些场进行地面测量，以验证前景看好的电场遥感“传真机”技术。这是基于对太阳氢线中横向斯塔克效应的测量。PI计划升级SPO仪器，将其灵敏度提高到1伏CM1，并通过观察运动电场(由于任何磁化等离子体中的随机交叉B粒子运动)来测试这种灵敏度，在这个灵敏度水平上，运动电场应该可以在太阳黑子色球中检测到。更广泛地说，他们计划每天操作传真机，研究与耀斑、喷发细丝、太阳黑子和光斑相关的电场的强度、几何以及空间和时间行为。他们还计划将传真机技术进一步扩展到红外领域，将有希望的氢线扩展到10条以上。这项红外工作将与FTS和Kitt Peak的主McMath光谱仪一起进行。这些研究的结果将与耀斑的放电和重联模型、耀斑后环、灯丝喷发的模型以及最近关于太阳丰度变化的观点进行比较。他们在这些地面观测中的经验还将被用来确定在红外中电传操作的最佳波长，并调查在气球、航天飞机或卫星上飞行的传真机是否可以在圆盘和肢体上实现电场测量的重要优势。