Participation in the SWAVES/STEREO project

日冕物质抛射（cme）是太阳活动中能量最高的一种。它们可以以不同的方式影响我们的地球环境。一方面，它们能够在自身前方驱动冲击波。这种冲击波能够将粒子加速到高能量。这些粒子可以穿透我们地球的大气层，导致众所周知的极光和电子设备的干扰。另一方面，日冕物质抛射伴随着磁场的冻结。如果日冕物质抛射撞击地球的磁层，就会引起磁暴，例如干扰船只和飞机的航行以及无线通讯。这些例子深刻地说明了理解日冕物质抛射和相关现象的重要性。美国宇航局STEREO任务的基本目标是研究日冕中cme的起源及其在行星际空间的传播，以及它们加速粒子的能力。SWAVES基本上由两台仪器组成，可以远程测量16兆赫和40千赫之间的无线电辐射，并探测10-40千赫频率范围内的原位等离子体波。由于无线电波被认为是在当地等离子体频率附近发射的，因此远程无线电观测允许跟踪cme驱动的来自太阳的冲击到1 AU。该研究项目的目的是开发一种软件工具，允许对STEREO上的其他仪器提供的波浪数据和数据进行综合分析，以及来自特伦斯多夫AIP太阳射电天文观测站的地面观测数据，以及来自其他射电和光学观测站的数据。综合数据分析将更好地了解日冕物质抛射的产生和传播以及相关现象，如太阳高能粒子的产生及其加速机制的细节。

Coronal mass ejections (CMEs) represent the most energetic kind of solar activity. They can influence our Earth s environment in different ways. On the one hand, they are able to drive a shock wave ahead of themselves. This shock wave is capable of accelerating particles to high energies. These particles can penetrate into our Earth s atmosphere leading to well-known auroral lights and disturbances of electronic equipment. On the other hand, CMEs are accompanied by a frozenin magnetic field. If a CME impinges the Earth s magnetosphere, it can cause magnetic storms perturbating e.g. the navigation of ships and aircrafts as well as wireless communications. These examples impressively demonstrate the importance of understanding CMEs and related phenomena.The basic aim of NASA s STEREO mission is to study the initiation of CMEs in the corona and their propagation through interplanetary space as well as their ability to accelerate particles. SWAVES is a package of basically two instruments, which allows to measure remotely the radio radiation between 16 MHz and 40 kHz and to detect in-situ plasma waves in the frequency range 10-40 kHz. Since the radio waves are regarded as being emitted near the local plasma frequency, remote radio observations allow for tracking the CME-driven shock from the Sun to 1 AU.The aim of this research project is to develop a software tool allowing a combined analysis of SWAVES data and data provided by other instruments onboard STEREO, as well as ground-based observations from the AIP s Observatory for Solar Radioastronomy at Tremsdorf, and data from other radio and optical observatories.The combined data analysis will provide a better understanding of the initiation and propagation of CMEs and related phenomena, like the production of solar energetic particles and the details of their acceleration mechanism.