IRF: Institutional Repository FHNW
Welcome to the publication and research database of the FHNW University of Applied Sciences and Arts Northwestern Switzerland.
The institutional repository contains publications, projects and student theses.
Further information can be found in the IRF manual (available in German).
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Recently added
Quasiperiodic pulsations and three-dimensional magnetic reconnection during 2022 March 31 flare observed by IRIS and STIX
(IOP Publishing, 2026) Lörinčík, Juraj; Collier, Hannah; Polito, Vanessa; Hayes, Laura A.; Ashfield, William H.; Freij, Nabil
Apparent slipping motions of flare ribbon kernels and the formation of hard X-ray (HXR) footpoints are important signatures of magnetic reconnection in solar flares. Ultraviolet (UV) and HXR ribbon emission can show quasiperiodic pulsations (QPPs), but the link between HXR QPP sources and slipping reconnection remains poorly understood. In this work, we analyze high-cadence IRIS and STIX observations of the 2022 March 31 M9.6 flare. STIX detected nonthermal QPPs with periods of ≈35 s from two relatively stationary footpoints. The majority of the HXR QPPs were correlated with UV pulsations observed by the IRIS Slit Jaw Imager in ribbon regions encompassing these footpoints. In one such region observed under the IRIS slit, the Si iv 1402.77 Å line exhibited pulsations in intensity, Doppler shift, and width, some of which were coincident with HXR QPPs. Apparent slipping motions of the UV kernels were also observed, but their locations, timing, and UV intensity variability showed lower correlation with the HXR QPPs. The ribbons along which the slipping kernels were found correspond well to footprints of quasi-separatrix layers, regions of high magnetic connectivity gradients, identified using a nonlinear force-free field extrapolation. Our multi-instrument analysis suggests that strong deposition of energy by nonthermal electrons was concentrated in a specific loop system within a large-scale 3D reconnection structure. Slipping kernels were subjected to weaker, if any, energization by nonthermal electrons, offering new constraints on 3D reconnection and flare energy release.
01A - Journal article
Vertikale Zeiterfahrung. Musikalische Seilbahnforschung
(Bildfluss, 2023) Roth, Michel; Roth, Michel; Aschwanden, Romed
Ergebnisse des Artistic Research Projekts "Alpine Netze der Verbundenheit" (Schweizer Nationalfonds/SPARK 2020-2022). Mit zahlreichen Klangbeispielen und Datenanalysen.
04A - Book part
Singende Seile, erzählende Menschen
(Bildfluss, 2023) Aschwanden, Romed; Hirtler, Christof; Roth, Michel; Roth, Michel; Aschwanden, Romed
Diskussion, Conclusio und Ausblick zum Forschungsprojekt "Alpine Netze der Verbundenheit".
04A - Book part
Im Dienste der Bildungspraxis oder der Bildungsforschung? Analysen und empirische Befunde zur Zeitschrift der Schweizerischen Gesellschaft für Bildungsforschung (SGBF) an-lässlich ihres 30-jährigen Bestehens
(Schweizerische Gesellschaft für Bildungsforschung, 01.10.2008) Lucien Criblez; Manz, Karin
01A - Journal article
KI in der Laufbahnberatung. Chancen und Herausforderungen
(12.05.2026) Pässler, Katja
06 - Presentation