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A Fresh Look at the Sun: New Opportunities with the launch of Solar-B

重新审视太阳：Solar-B 的推出带来新机遇

基本信息

批准号：
PP/D001129/1
负责人：
John Gerard Doyle
金额：
$ 25.44万
依托单位：
Armagh Observatory
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2006
资助国家：
英国
起止时间：
2006 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=PP%2FD001129%2F1
关键词：
Fresh Look Sun New Opportunities

项目摘要

In 2006 a new solar satellite called Solar-B will be launched. It is the first of a number of new solar missions that are due to be launched in the coming years. To maintain the momentum of solar physics in the UK, it is necessary to not only continue to support those missions that are still ongoing, e.g. CDS on SoHO, but to also work out ways to combine and complement the upcoming missions, particularly Solar-B. Here, we wish to address several topics where we have already made progress via SoHO observations but also to include new avenues of research. These include bright points, their relation to coronal heating, the contribution from waves, the contribution of plumes and streamers to the solar wind. Solar-B will enable substantial progress on understanding the origin and evolution of plumes, relatively dense structures that have been identified in the EUV in both polar and non-polar coronal holes. It is important to recognize that plumes can serve as probes of the coronal hole environment, which is otherwise largely unobservable without integrating over long intervals and/or lines of sight. Line width studies are an important probe for coronal heating. The reported decrease in line width above the limb coincides with the location where the observed line ratio of two coronal lines indicates a change from a collisionally to a radiatively dominant excitation regime. This has implications for far off-limb electron density measurements, as all density diagnostics calculations uses theoretical line ratios which only take collisional excitation into consideration. Further investigation into this is required. Interpretation of the observational data is highly dependent on many atomic physics parameters, one of these being the ionization fractions of the ion under consideration. A significant increase in intensity in lines from Li-like ions can occur at high electron densities if one considers electron density dependent dielectronic recombination. However, a decrease in the intensity of lines from Be-like ions can also occur at higher density. This may have major implications when comparing spectral lines formed at similar temperatures in high-density transient events.

2006年，将发射一颗名为Solar-B的新太阳能卫星。这是未来几年将发射的一系列新的太阳能任务中的第一个。为了保持英国太阳物理学的发展势头，不仅需要继续支持那些仍在进行中的任务，例如SoHO上的CDS，而且还需要找到联合收割机和补充即将到来的任务的方法，特别是Solar-B。在这里，我们希望解决几个主题，我们已经通过SOHO观测取得了进展，但也包括新的研究途径。这些包括亮点，它们与日冕加热的关系，波的贡献，羽流和流光对太阳风的贡献。Solar-B将在了解羽流的起源和演变方面取得实质性进展，羽流是在极紫外线和非极冕洞中发现的相对密集的结构。重要的是要认识到，羽流可以作为冕洞环境的探测器，否则，如果没有长时间间隔和/或视线的整合，很大程度上是无法观察到的。谱线宽度的研究是日冕加热的重要探测手段。所报告的减少线宽度以上的肢体一致的位置，其中所观察到的线比的两个冠状线表示的变化，从碰撞到辐射为主的激发制度。这对远离边缘的电子密度测量有影响，因为所有密度诊断计算都使用只考虑碰撞激发的理论线比。需要对此进行进一步调查。观测数据的解释高度依赖于许多原子物理参数，其中之一是所考虑的离子的电离分数。如果考虑电子密度依赖的双电子复合，则在高电子密度下可以发生来自Li样离子的线中强度的显著增加。然而，在更高的密度下，也可能发生来自Be样离子的谱线强度的降低。当比较在高密度瞬态事件中在相似温度下形成的谱线时，这可能具有重大意义。