Alexander Warmuth（德国波斯坦天体物理中心）：Five years of studying solar flares with STIX on Solar Orbiter

Of the six remote-sensing instruments aboard ESA's Solar Orbiter spacecraft, the Spectrometer/Telescope for Imaging X-rays (STIX) is the one dedicated to the study of solar flares. It performs X-ray imaging spectroscopy in the hard X-ray regime, which provides key physical diagnostics on both the hot thermal plasma as well as on the accelerated energetic electrons. During its operation since launch in 2020, STIX has detected over 80,000 solar flares.I will review how the STIX data have been used over the last five years to study energy release and particle acceleration in solar flares. In particular, I will focus on studies that have used STIX jointly with other observational assets, such as the other remote-sensing instruments on Solar Orbiter, instruments on other spacecraft (including the Chinese ASO-S mission), and various in-situ particle detectors.

Jake Mitchell（德国波斯坦天体物理中心）：Fitting STIX data with Sunkit-Spex, a Python based package for solar X-ray Spectroscopy

Sunkit-spex is a Python based package for solar X-ray spectroscopy that is currently under development. The main aim is to produce an open development, open source, python-first package that is able to provide the necessary framework and solar specific models to fit the current needs of the high-energy solar physics community whilst remaining flexible enough to support use cases presented by future missions. High energy spectroscopic analysis requires the use of instrument specific non diagonal response matrices to convert physical models from photon spectra to instrument modeled count spectra that can then, through forward fitting and other methods, be fit to observed data. This requires the use of a dedicated software package, several of which already exist (e.g., OSPEX or XSPEC) and are widely used by the community. However, none of these packages allow for simultaneous fitting of multiple datasets, provide necessary solar specific models, support time resolved spectroscopy and solar specific data products and have an easy installation procedure. Sunkit-spex has the capability to address all of these requirements and more. Through the creation of a generic data container, based on NDcube, Sunkit-spex aims to remain agnostic to a wide range of data products from existing and future missions whilst also aligning with the Astropy and Scipy modeling APIs allowing for user friendly yet flexible forward fitting methodologies. The focus of this work has been to build out a development version of Sunkit-spex that can be implemented within an automated fitting pipeline which can be used to acquire, reduce and analyse all >M5 class flares of the current solar cycle.

Song Tan（德国波斯坦天体物理中心）：Solar Orbiter/EUI-STIX Era Solar Physics Research: From Data to Scientific Discovery

This presentation demonstrates our systematic work based on Solar Orbiter/EUI and STIX observations, from data processing to scientific discoveries. We developed the SolarZip compression framework for EUI data, achieving 800× compression ratios while preserving scientific usability and reducing transmission time by 270×. Using EUI's unprecedented resolution with STIX observations, we discovered extremely short-lived solar jets (22-second lifetimes—35× shorter than traditional observations) and proposed  the "magnetic erosion effect" concept for understanding filament stability through ubiquitous small-scale magnetic reconnection events. We also developed the SJET interactive analysis tool, establishing a standardized framework for solar jet research. These works demonstrate the crucial role of EUI and STIX in advancing solar physics research.

报告时间：2025年9月10日14:00

报告地点：紫台仙林园区3号楼402会议室

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