Research of Solar Very Small Velocity Fields by Magneto-Optical Filter

磁光滤波器研究太阳极小速度场

• 批准号: 06640362
• 负责人: MIYAZAKI Hideaki
• 金额: $ 1.22万
• 依托单位: National Astronomical Observatory of Japan
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06640362/
• 关键词: Hello-Seismology; Long life Maneto-Optical Filler; High Tempareture Sodium Gas Cell; 高温ナトリウムガスセル; 太陽振動・微小速度場; 太陽の対流層の力学とダイナモ作用; 太陽面振動 微小速度場; 高温ナトリウム ガスセル

The magneto-optical filter (MOF or Caccianl filter) is made of a transparent cell placed in a strong magnetic field. The cell contains the vapor of material like sodium. By utilizing the magneto-optical effect near the wavelength of a spectral line, MOF provides a very narrow and stable passband, which is perticularly suitable for helio-seismological observations. We started basic experimental studies on this type of filters in 1984. In the design of most MOF's, only the sodium reservoir is heated, so that the sodium vapor attaches onto the wall when it cools there. The cell therefore becomes less transparent as it ages, and can only be used in observations for several months. Our aim was to construct a filter that can be continuously used for 10-20 years without losing the sodium vapor at the cell wall. This was achived by heating the whole cell to about 200ﾟC.We developed the method of Introducing the new material that is stable for high temperature sodium gas. As this development was necessary very long term for each affair, we chould finish only the construciton of the new MOF system, and so the data obtainment of solar velocity fields has just started.We descrive the process of the development and experimental results.

磁光滤波器（MOF或Caccianl滤波器）由放置在强磁场中的透明单元制成。电池中含有像钠这样的物质的蒸汽。由于利用了谱线波长附近的磁光效应，MOF提供了一个非常窄而稳定的通带，特别适合于日震观测。我们在1984年开始了对这种类型的过滤器的基本实验研究。在大多数MOF的设计中，只有钠储存器被加热，使得钠蒸汽在那里冷却时附着在壁上。因此，随着年龄的增长，细胞变得不那么透明，只能用于观察几个月。我们的目标是构建一个过滤器，可以连续使用10-20年，而不会损失细胞壁的钠蒸气。这是通过将整个电池加热到约200摄氏度来实现的。我们开发了引入对高温钠气体稳定的新材料的方法。由于这一发展是每一项事务都需要很长一段时间的，我们只能完成新的MOF系统的建设，因此太阳速度场数据的获取才刚刚开始。