Tootfinder

Electric fields and waves in the Venus nightside magnetosphere
Forrest Mozer, Oleksiy Agapitov, Stuart Bale, John Bonnell, Marc Pulupa, Tim Quinn, Andrii Voschchepynets
https://arxiv.org/abs/2505.12618

Electric fields and waves in the Venus nightside magnetosphere
On November 6, 2024, the Parker Solar Probe flew past Venus to make the first accurate electric field measurement in the nightside Venusian magnetosphere. To achieve this result, the electric field antennas were current biased in a way never before experienced by an electric field detector. This biasing requirement, that the positive bias current in the Venus shadow be about equal to the electron thermal current, is discussed and illustrated. About one minute of useful electric f ield data in t…

YSO Jets Driven by Magnetic Pressure Generated through Stellar Magnetosphere-Disk Interaction
Yisheng Tu, Zhi-Yun Li, Zhaohuan Zhu, Xiao Hu, Chun-Yen Hsu
https://arxiv.org/abs/2506.11333

YSO Jets Driven by Magnetic Pressure Generated through Stellar Magnetosphere-Disk Interaction
The origin of jets in young stellar objects (YSOs) remains a subject of active investigation. We present a 3D non-ideal magnetohydrodynamic simulation of jet launching in YSOs, focusing on the interaction between the stellar magnetosphere and the circumstellar disk. At the beginning of the simulation, the magnetosphere partially opens, forming two oppositely directed magnetic field regions: one threading the star and the other threading the inner disk. The latter dominates over the original dis…

On the Fast-radio-burst-associated X-ray Bursts: Inverse Compton Scattering of Radio Photons by an Extreme Pair Flow During Magnetosphere Activities
Yue Wu, Yuan-Pei Yang, Fa-Yin Wang, Zi-Gao Dai
https://arxiv.org/abs/2507.12405

On the Fast-radio-burst-associated X-ray Bursts: Inverse Compton Scattering of Radio Photons by an Extreme Pair Flow During Magnetosphere Activities
The Galactic fast radio burst (FRB) FRB 200428 was associated with a short X-ray burst (XRB) from the magnetar SGR J1935+2154 during one of its active phases. This FRB-associated XRB exhibits distinct properties compared to other typical XRBs, including a significantly higher cutoff energy and a steeper power-law index. Its recovered X-ray light curve shows a multiple-peak structure, with the time of arrival offset from that of the FRB. These unique features imply a special physical link betwee…

Phase-Space Synchronization Driven by Moon-Magnetosphere Coupling in Gas Giants
Adnane Osmane, Elias Roussos, Peter Kollmann
https://arxiv.org/abs/2507.07739

Phase-Space Synchronization Driven by Moon-Magnetosphere Coupling in Gas Giants
We present a new theoretical framework to describe the rapid and spatially localized loss of energetic particles in planetary radiation belts, focusing on interactions between gas giant magnetospheres and their moons. Observations show that flux depletions--known as microsignatures--often refill on timescales comparable to a single drift period, which conflicts with traditional quasi-linear radial diffusion models that assume slow, gradual transport and predict refilling only over many drift pe…

Gravitational waves in minimal Maxwell $f(R)$ gravity
Salvatore Capozziello, Qingyu Gan
https://arxiv.org/abs/2507.06094 https://arxi…

Gravitational waves in minimal Maxwell $f(R)$ gravity
We discuss the conversion mechanism from scalar field to gravitational waves in magnetic background in $f(R)$ gravity minimal coupled to the Maxwell electrodynamics. Applying the conversion in early universe with primordial magnetic field and the neutron star with strong magnetosphere, the generated gravitational waves, converted from the scalar field, exhibit distinct power spectra which can be potentially probed by future experiments such as DECIGO, BBO, CE and ET.

Energetic ($< 2$ MeV) Ion Environment of the Magnetosphere as measured by ASPEX-STEPS on board Aditya-L1 during its earth-bound phase
Dibyendu Chakrabarty, Bijoy Dalal, Santosh Vadawale, Aveek Sarkar, Shiv Kumar Goyal, Jacob Sebastian, Anil Bhardwaj, P. Janardhan, M. Shanmugam, Neeraj Kumar Tiwari, Aaditya Sarda, Piyush Sharma, Aakash Gupta, Prashant Kumar, Manan S. Shah, Bhas Bapat, Pranav R Adhyaru, Arpit R. Patel, Hitesh Kumar Adalja, Abhishek Kumar, Tinkal Ladiya, Sushil Kumar, …

Energetic ($< 2$ MeV) Ion Environment of the Magnetosphere as measured by ASPEX-STEPS on board Aditya-L1 during its earth-bound phase
During its earth-bound phase of the Aditya-L1 spacecraft of India, the Supra-Thermal and Energetic Particle Spectrometer (STEPS) of the Aditya Solar wind Particle EXperiment (ASPEX) was operated whenever the orbit was above 52000 km during 11-19 September 2023. This phase of operation provided measurements of energetic ions (with energies 0.1-2 MeV) in the magnetosphere, magnetosheath, and interplanetary medium. Three interplanetary coronal mass ejections (ICME) hit the magnetosphere during thi…

Global Kinetic Simulations of Monster Shocks and Their Emission
Dominic Bernardi, Yajie Yuan, Alexander Y. Chen
https://arxiv.org/abs/2506.04175 https://…

Global Kinetic Simulations of Monster Shocks and Their Emission
Fast magnetosonic waves are one of the two low-frequency plasma modes that can exist in a neutron star magnetosphere. It was recently realized that these waves may become nonlinear within the magnetosphere and steepen into some of the strongest shocks in the universe. These shocks, when in the appropriate parameter regime, may emit GHz radiation in the form of precursor waves. We present the first global Particle-in-Cell simulations of the nonlinear steepening of fast magnetosonic waves in a di…

Whistler Chorus Amplification in the Magnetosphere: A Nonlinear Free-Electron Laser Model Based on the Ginzburg-Landau Equation
Brandon Bonham, Amitava Bhattacharjee
https://arxiv.org/abs/2506.06167

Whistler Chorus Amplification in the Magnetosphere: A Nonlinear Free-Electron Laser Model Based on the Ginzburg-Landau Equation
We present a novel nonlinear model for whistler-mode chorus amplification based on the free-electron laser (FEL) mechanism. First, we derive the nonlinear collective variable equations for the whistler-electron interaction. Consistent with in situ satellite observations, these equations predict that a small seed wave can undergo exponential growth, reaching a peak of a few hundred picoteslas after a few milliseconds, followed by millisecond timescale amplitude modulations. Next, we show that wh…

This https://arxiv.org/abs/2405.02199 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Alfvén Wave Conversion to Low Frequency Fast Magnetosonic Waves in Magnetar Magnetospheres
Rapid shear motion of magnetar crust can launch Alfvén waves into the magnetosphere. The dissipation of the Alfvén waves has been theorized to power the X-ray bursts characteristic of magnetars. However, the process by which Alfvén waves convert their energy to X-rays is unclear. Recent work has suggested that energetic fast magnetosonic (fast) waves can be produced as a byproduct of Alfvén waves propagating on curved magnetic field lines; their subsequent dissipation may power X-ray bursts…

Nanosatellites for the study of high-energy particles$'$ microbursts$'$ nature in the Earth$'$s magnetosphere: an idea of cosmic experiment
O. V. Dudnik, E. V. Kurbatov
https://arxiv.org/abs/2506.22798

Nanosatellites for the study of high-energy particles$'$ microbursts$'$ nature in the Earth$'$s magnetosphere: an idea of cosmic experiment
A concept of a cosmic scientific experiment is presented. The main goal of the experiment is the study of miscrobursts of charged particles of high energy in the Earth$'$s magnetosphere. The experiment is designed to use a nanosatellite platform. The paper describes the functional scheme, structural features and technical characteristics of a miniature detector-analyser of electrons and protons, MiRA$\_$ep. Keywords: radiation belt, electron, nanosatellite, silicon detector, organic scintillato…

Interlinking internal and external magnetic fields of relativistically rotating neutron stars
D. Ntotsikas, K. N. Gourgouliatos
https://arxiv.org/abs/2506.04198

Interlinking internal and external magnetic fields of relativistically rotating neutron stars
This work presents a global solution for the internal and the external field of an axisymmetric rotating neutron star. It is shown that the twist of the internal field affects the external field, by increasing the number of open field lines and eventually the spin-down rate of the star. This effect is far more drastic if the toroidal field, and consequently the poloidal current flowing within the star, is allowed to populate the closed field lines of the magnetosphere, rather than if it remains…

Planar Collisionless Shock Simulations with Semi-Implicit Particle-in-Cell Model FLEKS
Hongyang Zhou, Yuxi Chen, Chuanfei Dong, Liang Wang, Ying Zou, Brian Walsh, G\'abor T\'oth
https://arxiv.org/abs/2506.08384

Planar Collisionless Shock Simulations with Semi-Implicit Particle-in-Cell Model FLEKS
This study investigates the applicability of the semi-implicit particle-in-cell code FLEKS to collisionless shock simulations, with a focus on the parameter regime relevant to global magnetosphere modeling. We examine one- and two-dimensional local planar shock simulations, initialized using MHD states with upstream conditions representative of the solar wind at 1 au, for both quasi-perpendicular and quasi-parallel configurations. The refined algorithm in FLEKS proves robust, enabling accurate …

Relativistic van Allen belts in magnetospheres of pulsars and white dwarfs
Maxim V. Barkov, Maxim Lyutikov
https://arxiv.org/abs/2506.20515 https://…

Relativistic van Allen belts in magnetospheres of pulsars and white dwarfs
We consider dynamics and multi-frequency emission patterns of relativistic van Allen belts - particles trapped in the magnetosphere of neutron stars and white dwarths. We account for synchrotron radiative losses and effects of relativistic beaming of radiation. The system is non-Hamiltonian (non-energy conserving): this results in a wide non-scalable variety of spectral and temporal behaviors. There are three types of trapped particles' trajectories: (i) oscillating (particles experience mult…

Evidence of the Earth's inner radiation belts during the low Solar and geomagnetic activity obtained with the STEP-F instrument
O. V. Dudnik, O. V. Yakovlev
https://arxiv.org/abs/2506.21218

Evidence of the Earth's inner radiation belts during the low Solar and geomagnetic activity obtained with the STEP-F instrument
Purpose: The subject of research is the spatio-temporal charged particles in the Earth's magnetosphere outside the South Atlantic magnetic Anomaly during the 11-year cycle of solar activity minimum. The work aims at searching for and clarifying the sustained and unstable new spatial zones of enhanced subrelativistic electron fluxes at the altitudes of the low Earth orbit satellites. Design/methodology/approach: Finding and ascertainment of new radiation belts of the Earth were made by using t…

How the Shortest and Longest HILDCAAs Shaped Earth Outer Radiation Belt During the Van Allen Probes Era?
Ayushi Nema, Ankush Bhaskar, Kamlesh N. Pathak, Abhirup Datta
https://arxiv.org/abs/2505.16598

How the Shortest and Longest HILDCAAs Shaped Earth Outer Radiation Belt During the Van Allen Probes Era?
High-intensity long-duration continuous auroral electrojet (AE) activity (HILDCAA) events are associated with the enhancement of relativistic electron fluxes in the inner magnetosphere. The physical mechanisms underlying this enhancement are not well established yet. In this study, we analyze two contrasting HILDCAA events, one representing the shortest and the other the longest duration, using NASA Van Allen Probes observations, which have provided unprecedented, unique in-situ observations of…