A5023068019- Ionosphere and magnetosphere dynamics
- Earthquake Detection and Analysis
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Geophysical and Geoelectrical Methods
- Statistical and numerical algorithms
- Galaxies: Formation, Evolution, Phenomena
- Solar Radiation and Photovoltaics
- Astronomy and Astrophysical Research
- GNSS positioning and interference
- Blind Source Separation Techniques
- Vehicle Noise and Vibration Control
- Climate variability and models
- Meteorological Phenomena and Simulations
- Tropical and Extratropical Cyclones Research
- Atmospheric Ozone and Climate
- Speech and Audio Processing
- Lightning and Electromagnetic Phenomena
Boston University
2022-2025
Nagoya University
2025
National Astronomical Observatory of Japan
2025
Courant Institute of Mathematical Sciences
2023
New York University
2023
University of California System
2023
University of California, Los Angeles
2023
Imperial College London
2023
University of California, Berkeley
2023
Advanced Heliophysics
2023
Abstract Electromagnetic ion cyclotron (EMIC) waves are known to be efficient for precipitating >1 MeV electrons from the magnetosphere into upper atmosphere. Despite considerable evidence showing that EMIC‐driven electron precipitation can extend down sub‐MeV energies, precise physical mechanism driving remains an active area of investigation. In this study, we present event observed by ELFIN CubeSats on 11 January 2022, exclusively at energy L ∼ 8–10.5, where trapped were nearly absent....
Abstract In the present-day universe, most massive galaxies are ellipticals located in cores of galaxy clusters, harboring heaviest super-massive black holes (SMBHs). However, mechanisms that drive early growth phase and subsequent transformation morphology kinematics remain elusive. Here we report (sub)kiloparsec-scale observations stars, gas, dust ADF22.A1, a bright dusty starburst at $z=3.1$, hosting heavily obscured active galactic nucleus residing proto-cluster core. ADF22.A1 is giant...
Abstract Precipitation into the Earth's atmosphere due to pitch angle scattering by plasma waves has been recognized as one of major loss mechanisms for energetic electrons. In this study, we quantitatively evaluate their roles in precipitating electrons during a conjunction event with modulated electron precipitation observed at low altitudes Electron Loss and Fields INvestigation three types whistler mode (hiss, plume hiss, chorus) measured near equator Time History Events Macroscale...
Abstract The total electron density is a fundamental quantity in the Earth's magnetosphere and plays an important role number of physical processes, but its dynamic global evolution not fully quantified yet. We present implementation specific type recurrent neural network (encoder‐decoder), which distinct from previous models, to construct based on multiyear data Van Allen Probes. history geomagnetic indices first encoded into hidden state H , then together with auxiliary information...
Abstract Whistler mode waves in the plasmasphere and plumes drive significant losses of energetic electrons from Earth's radiation belts into upper atmosphere. In this study, we conducted a survey amplitude‐dependent whistler wave properties analyzed their associated background plasma conditions electron fluxes plumes. Our findings indicate that extremely large amplitude (>400 pT) (a) tend to occur at L > 4 over midnight‐dawn‐noon sectors have small normal angles; (b) are more likely...
Abstract Whistler‐mode hiss waves are crucial to the dynamics of Earth's radiation belts, particularly in scattering and loss energetic electrons forming slot region between inner outer belts. The generation involves multiple potential mechanisms, which under active research. Understanding role belt their mechanisms requires analyzing temporal spatial evolutions, especially for strong waves. Therefore, we developed an Imbalanced Regressive Neural Network (IR‐NN) model predicting amplitudes....
Abstract The heliosphere is permeated with highly structured solar wind originating from the Sun. One of primary science objectives Parker Solar Probe (PSP) to determine structures and dynamics plasma magnetic fields at sources wind. However, establishing connection between in situ measurements atmosphere challenging: most footpoint mapping techniques have significant uncertainties source localization a parcel observed situ, PSP suffer limited field view. Therefore, it lacks universal tool...
Abstract Alfvén waves, considered one of the primary candidates for heating and accelerating fast solar wind, are ubiquitous in spacecraft observations, yet their origin remains elusive. In this study, we analyze data from first 19 encounters Parker Solar Probe report dominance 2 minute oscillations near surface. The frequency-rectified trace magnetic power spectral density (PSD) these indicates that fluctuation energy is concentrated around minutes “youngest” wind. Further analysis using...
Empirical models have been previously developed using the large dataset of satellite observations to obtain global distributions total electron density and whistler-mode wave power, which are important in modeling radiation belt dynamics. In this paper, we apply empirical construct amplitudes chorus hiss, compare them with along Van Allen Probes orbits evaluate model performance. The constructed Hp30 SME (or SML) indices. provides an overall high correlation coefficient observations, while...
Whistler-mode chorus waves play an essential role in the acceleration and loss of energetic electrons Earth's inner magnetosphere, with more intense producing most dramatic effects. However, it is challenging to predict amplitude strong due imbalanced nature dataset, i.e., there are many non-chorus data points than waves. Thus, traditional models usually underestimate wave amplitudes significantly during active times. Using regressive method, we develop a neural network model lower-band (LB)...
Abstract Interchange instability is known to drive fast radial transport of electrons and ions in Jupiter's inner middle magnetosphere. In this study, we conduct a statistical survey evaluate the properties energetic particles plasma waves during interchange events using Juno data from 2016 2023. We present representative examples followed by analysis spatial distribution, duration extent. Our indicates that predominant at M ‐shells 6 26, peaking near 17 with an average minutes corresponding...
Hiss waves play an important role in removing energetic electrons from Earth’s radiation belts by precipitating them into the upper atmosphere. Compared to plasmaspheric hiss that has been studied extensively, evolution and effects of plume are less understood due challenge obtaining their global observations at high cadence. In this study, we use a neural network approach model both total electron density wave amplitudes plasmasphere plume. After describing development, apply storm event...
Abstract Whistler‐mode chorus waves play an essential role in the acceleration and loss of energetic electrons Earth’s inner magnetosphere, with more intense producing most dramatic effects. However, it is challenging to predict amplitude strong due imbalanced nature data set, that is, there are many non‐chorus points than waves. Thus, traditional models usually underestimate wave amplitudes significantly during active times. Using regressive (IR) method, we develop a neural network model...
We show an application of supervised deep learning in space sciences. focus on the relativistic electron precipitation into Earth’s atmosphere that occurs when magnetospheric processes (wave-particle interactions or current sheet scattering, CSS) violate first adiabatic invariant trapped radiation belt electrons leading to loss. Electron is a key mechanism loss and can lead several weather effects due its interaction with atmosphere. However, detailed properties drivers are currently not...
Wave-particle interactions play a pivotal role in determining the radiation belt electron evolution, especially during periods of geomagnetically disturbed times. When electrons are scattered into loss cone, they undergo precipitation Earth's atmosphere and consequently lost from magnetosphere. This process significantly affects physical chemical processes atmosphere, as well dynamics However, due to limited observational data wave activity space, quantifying amount wave-particle...
In the present-day universe, most massive galaxies are ellipticals located in cores of galaxy clusters, harboring heaviest super-massive black holes (SMBHs). However mechanisms that drive early growth phase and subsequent transformation these morphology kinematics remain elusive. Here we report (sub)kiloparsec scale observations stars, gas, dust ADF22.A1, a bright dusty starburst at z=3.1, hosting heavily obscured active galactic nucleus residing proto-cluster core. ADF22.A1 is giant spiral...
Abstract Whistler mode waves scatter energetic electrons, causing them to precipitate into the Earth's atmosphere. While interactions between whistler and electrons are well understood, global distribution of electron precipitation driven by needs futher investigations. We present a two‐stage method, integrating neural networks quasi‐linear theory, simulate waves. By applying this approach 17 March 2013 geomagnetic storm event, we reproduce rapidly varying pattern over various phases storm....
The Earth's inner magnetosphere is a complex, non-linear, interconnected system driven by external solar wind driving and internal processes. A neural network approach has been proposed to reconstruct predict the complexity of magnetospheric environment [Bortnik 2016], including cold plasma density [Chu et al., 2017a; b], waves such as whistler-mode chorus, hiss waves, EMIC ULF 2018], electron fluxes 2021; Ma 2022]. While can be accurately modeled in these studies, ML-based models are...
One of the primary science objectives Parker Solar Probe (PSP) is to determine structures and dynamics plasma magnetic fields at sources solar wind. However, establishing connection between {\it in situ} measurements atmosphere challenging: most footpoint mapping techniques have significant uncertainties source localization a parcel observed situ}, PSP suffer from limited field view. Therefore it interest investigate whether can be used on their own identify streams originating same corona...