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Understanding Galactic Cosmic Rays in the Local Bubble and beyond.

了解本地气泡及其以外的银河宇宙射线。

基本信息

批准号：
2109103
负责人：
Mikhail Malkov
金额：
$ 48.68万
依托单位：
University of California-San Diego
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-08-15 至 2024-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2109103&HistoricalAwards=false
关键词：
Understanding Galactic Cosmic Rays Local

项目摘要

Cosmic rays are charged particles that have been accelerated to high energies throughout the universe. This project aims to explain a feature in the spectrum of observed cosmic ray energies through a mechanism driven by passing stars or supernova remnants in a nearby region of the Milky Way. The team will perform computer simulations to test if this explanation can reproduce the observed feature and predict other observable features. The team will also incorporate their research into the UCSD STARS (Summer Training Academy for Research Success) program. This award advances the goals of the Windows on the Universe Big Idea. The project will use a combination of analytical and numerical simulations of the re-acceleration of cosmic rays by weak shocks in the Local Bubble. These simulations will model the injection, transport, angular structure, and chemical composition of cosmic rays that have been re-accelerated by the shocks and then transported to the earth through magnetic flux tubes. The results will be compared with observations to determine whether this scenario can successfully explain the properties of the bump in the cosmic ray spectrum at intermediate energies. The work will be incorporated into a summer program at UCSD STARS and will also support the mentorship of a student from an underserved community in the San Diego area.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

宇宙射线是在宇宙中被加速到高能量的带电粒子。该项目旨在通过银河系附近区域经过的恒星或超新星遗迹驱动的机制，解释观测到的宇宙射线能量光谱中的一个特征。该团队将进行计算机模拟，以测试这种解释是否可以重现观察到的特征并预测其他可观察到的特征。该团队还将把他们的研究纳入UCSD STARS（夏季研究成功培训学院）计划。该奖项推进了Windows on the Universe Big Idea的目标。该项目将使用分析和数值模拟相结合的方式，对局部气泡中的弱冲击引起的宇宙射线再加速进行模拟。这些模拟将模拟宇宙射线的注入、传输、角结构和化学成分，这些宇宙射线被冲击重新加速，然后通过磁通量管传输到地球。结果将与观测结果进行比较，以确定这种情况是否可以成功地解释宇宙射线光谱中中等能量的碰撞特性。这项工作将被纳入UCSD STARS的暑期项目，并将支持来自圣地亚哥地区服务不足社区的学生的指导。该奖项反映了NSF的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。