Tootfinder

Factorized Tail Volatility Model: Augmenting Excess-over-Threshold Method for High-Dimensional Hevay-Tailed Data
Yifan Hu, Yanxi Hou
https://arxiv.org/abs/2506.00840

Factorized Tail Volatility Model: Augmenting Excess-over-Threshold Method for High-Dimensional Hevay-Tailed Data
Ecess-over-Threshold method is a crucial technique in extreme value analysis, which approximately models larger observations over a threshold using a Generalized Pareto Distribution. This paper presents a comprehensive framework for analyzing tail risk in high-dimensional data by introducing the Factorized Tail Volatility Model (FTVM) and integrating it with central quantile models through the EoT method. This integrated framework is termed the FTVM-EoT method. In this framework, a quantile-rel…

A Criterion for Magnetars Producing Giant Flares
Y. Meng, Q. -S. Zhang, J. Lin
https://arxiv.org/abs/2505.24128 https://arxiv.org/pdf…

A Criterion for Magnetars Producing Giant Flares
In this work, the straight flux rope in the model of giant flares on magnetars (Meng et al. 2014) was replaced with a curved one and the equilibrium behavior of the flux rope was investigated. Two footpoints of the flux rope are anchored to the spherical surface of magnetar. The forces acting on the flux rope include magnetic tension, magnetic pressure, curvature force, gravity. The equilibrium in the flux rope, so as in the global configuration, is achieved as these forces offset each other. C…

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Systematic non-thermal velocity increase preceding soft X-ray flare onset
Andy S. H. To, Abigail Burden, Deborah Baker, Henrik Eklund, David H. Brooks, Laura A. Hayes, Juan Mart\'inez-Sykora, Paola Testa, Jeffrey Reep, Miho Janvier, Shinsuke Imada, Julio Hernandez Camero, David M. Long, Teodora Mihailescu, Micah J. Weberg
https://

Systematic non-thermal velocity increase preceding soft X-ray flare onset
Non-thermal velocities, derived from spectral line broadening, can provide crucial insights into plasma dynamics before and during solar flares. To systematically study the pre-flare phase, we constructed a Hinode/Extreme-ultraviolet Imaging Spectrometer (EIS) flare catalog of 1,449 flares from 2011-2024. This enabled a large-scale analysis of flare loop footpoint non-thermal velocity evolution across different flare magnitudes (C, M, X-classes). Analyzing Fe VIII - Fe XXIV emission lines forme…

The Full Nonlinear Vortex Tube-Vorton Method: the post-stall condition
Pimentel-Garcia Jesus Carlos, Jimenez-Ponce Luis Antonio
https://arxiv.org/abs/2506.18719

The Full Nonlinear Vortex Tube-Vorton Method: the post-stall condition
The original concepts behind The Full Nonlinear Vortex Tube-Vorton Method (FTVM) have been applied to the study of massively separated fluid flow past a thin body. In the pre-stall condition, the Kutta-Zhukovski (KJ) force calculation was successfully implemented. However, for the post-stall condition, this approach is not capable of capturing the form drag component. Thus, an alternative force calculation method is implemented. The results obtained demonstrate that the fluid motion involving c…

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Spatiotemporal evolution of UV pulsations and their connection to 3D magnetic reconnection and particle acceleration
Stefan Purkhart, Hannah Collier, Laura A. Hayes, Astrid M. Veronig, Miho Janvier, S\"am Krucker
https://arxiv.org/abs/2506.03825

Spatiotemporal evolution of UV pulsations and their connection to 3D magnetic reconnection and particle acceleration
Quasi-periodic pulsations (QPPs) are a common feature of impulsive solar flare emissions, yet their driving mechanism(s) remain unresolved. We study long-period (3.4 min) QPPs in the M3.7 flare on Feb 24, 2023, using SDO/AIA and Solar Orbiter/STIX to pinpoint their source and driver. We analyzed UV and HXR emissions from four subregions covering the flare ribbons and footpoints of the erupting filament. We find the QPP characteristics varied significantly across these regions. The strongest UV …