Seminare am MPS

Zu allen Seminaren und Vorträgen am MPS sind interessierte Besucher herzlich willkommen. Die Präsentationen werden hauptsächlich in englischer Sprache gehalten, genauere Informationen zu Themen, Rednern und Terminen sind auf den einzelnen Seminar-Seiten zu finden. Bei Institutsseminaren und Kolloquien präsentieren geladene Gastwissenschaftler anderer Institute Erfolge und Resultate ihrer Forschung. In den S3 Seminaren erklären Doktoranden der Internationalen Max Planck Research School (IMPRS) ihre Arbeit. In den Seminaren über Planeten und Kometen (PGS) sowie den Seminaren über die Sonne und sonnenähnlicher Sterne (SSGS), berichten die Wissenschaftler aus den jeweiligen Abteilungen über neueste Ergebnisse und Fortschritte in ihren Projekten und stellen neue Missionen vor. Bei allen Seminaren findet im Anschluss an den Vortrag eine kurze Diskussions- bzw. Fragerunde zum Thema statt.

MPS Seminar: Slitless Spectroscopy for the Solar Corona - A New paradigm from MaGIXS (Athiray Panchapakesan)

Imaging of the Sun at high energies in EUV and X-rays have revolutionized our understanding of the outermost atmosphere of the Sun, the solar corona. Precise determination of plasma diagnostics including temperature, density, abundances, line-of-sight velocities require spectroscopy. Traditionally, slit-based instruments probe the Sun with high spectral resolution through long, narrow slits. 2D pure spectral images are created by stepping the slit, called raster, over the region of interest. During the raster process, we lose co-temporal observations of the spatial structures. This difficulty can be overcome with slitless spectrograph instruments, which can take a snapshot of a wide field of view on the Sun, with dispersed spectral images overlapped from different spatial locations on the Sun. Such instrument was last flown successfully in Skylab and were abandoned since 1970s due to the difficulty of unfolding the overlapping spatial and spectral information. Such data are called spectroheliogram (or) overlappogram. Recently, novel inversion algorithms have been successfully demonstrated to unlock the potential of slitless spectrographs. The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS), a NASA sounding rocket mission, pioneered measurement of the soft X-ray overlappogram of the solar corona. During its first flight, MaGIXS-1 observed several diagnostic emission lines to constrain frequency of heating in active region loops. Here, I will present an overview of overlappogram instruments, showcase science highlights from MaGIXS-1 flight, and finally describe plans for the upcoming MaGIXS-2 rocket campaign, scheduled for July 2024. [mehr]

MPS Seminar: Constraining the nanoflare heating frequency from observations and models. (Biswajit Mondal)

Nanoflares are considered prime candidates for heating the non-flaring solar corona. However, direct detection of individual nanoflares with present-generation instruments remains challenging. Understanding the frequency and magnitude of nanoflares is crucial for comprehending their role in coronal heating. In this study, we employ a field-aligned hydrodynamic model to simulate the emission from a non-flaring X-ray bright point (XBP) observed by the Marshall Grazing Incidence X-ray Spectrometer (MaGIXS). The length and magnetic field strength of the coronal loops associated with this XBP are derived from magnetic field extrapolation of observed photospheric magnetograms by SDO/HMI. Each loop is assumed to be heated by random nanoflares, whose frequency and magnitude are determined by the loop length and their field strength. The simulation results are then compared and matched against the observation to determine the nanoflare heating frequency. We will discuss the findings of this study. Furthermore, we will discuss the evolution of nanoflare heating frequency during the formation and decay of an active region (AR) on the solar disk. [mehr]
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