Measurement of Solar Plasma Electric Fields

这个计划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、等离子体和高能粒子加速中的重要性，太阳等离子体电场受到的关注相对较少。这项建议是对这些场进行地面测量，以验证有前途的电场遥感“电描”技术。这是基于太阳氢谱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/厘米1，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）来测试这一灵敏度，在这一灵敏度水平下，太阳黑子色球层中应该可以检测到运动电场。更广泛地说，他们计划每天操作电描记器，以研究与耀斑、爆发灯丝、太阳黑子和光斑相关的电场的强度、几何形状、空间和时间行为。他们还计划将电描记技术进一步扩展到红外线，包括有希望的氢谱线超过10。这项红外工作将与FTS和基特峰的主McMath摄谱仪一起进行。这些调查的结果将比较的放电和重联模型的耀斑，模型的耀斑后循环，灯丝爆发，也对太阳丰度变化的最新想法。他们在这些地面观测中的经验也将用于确定红外线电描记器操作的最佳波长，并研究用气球、航天飞机或卫星上的电描记器在圆盘和边缘上进行电场测量是否具有重要的优点。

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.