A5021774471- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Spacecraft and Cryogenic Technologies
- Astrophysics and Star Formation Studies
- Atmospheric Ozone and Climate
- Space Science and Extraterrestrial Life
- Magnetic confinement fusion research
- Planetary Science and Exploration
- Cyclone Separators and Fluid Dynamics
- Space exploration and regulation
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Earthquake Detection and Analysis
- Tribology and Lubrication Engineering
- Gamma-ray bursts and supernovae
- Spacecraft Design and Technology
- Radioactive Decay and Measurement Techniques
- Elasticity and Material Modeling
- solar cell performance optimization
- Superconducting and THz Device Technology
- Nuclear Physics and Applications
Johns Hopkins University Applied Physics Laboratory
2019-2024
Johns Hopkins University
2023
Allentown Public Library
2023
Catholic University of America
2014-2022
United States Naval Research Laboratory
2015-2018
George Mason University
2018
University Corporation for Atmospheric Research
2015-2017
Goddard Space Flight Center
2014-2015
University of America
2014-2015
Russian Academy of Sciences
2009-2014
During the course of its evolution, our Sun and protective magnetic bubble have plowed through dramatically different interstellar environments throughout galaxy. The vast range conditions plasma, gas, dust high-energy cosmic rays on this "solar journey" helped shape solar system that we live in. Today, bubble, or Heliosphere, is likely about to enter a completely new regime space will, yet again, change entire heliospheric interaction how it shields us from environment. Interstellar Probe...
Analysis of a longitudinal wave event observed by the Atmospheric Imaging Assembly (AIA) onboard Solar Dynamics Observatory is presented. A time sequence 131 Å images reveals that C-class flare occurred at one footpoint large loop and triggered an intensity disturbance (enhancement) propagating along it. The spatial features temporal evolution suggest fundamental standing slow-mode could be set up quickly after meeting two initial disturbances from opposite footpoints. oscillations have...
Abstract We examine the different element abundances exhibited by closed loop solar corona and slow speed wind. Both are subject to first ionization potential (FIP) effect, enhancement in coronal abundance of elements with FIP below 10 eV (e.g., Mg, Si, Fe) respect high-FIP O, Ne, Ar), but subtle differences. Intermediate elements, S, P, C, just above eV, behave as loops, fractionated more like low-FIP On basis fractionation ponderomotive force chromosphere, we discuss scenarios where this...
Abstract The launches of Parker Solar Probe (Parker) and Orbiter (SolO) are enabling a new era solar wind studies that track the from its origin at photosphere, through corona, to multiple vantage points in inner heliosphere. A key ingredient for these models is input photospheric magnetic field map provides boundary condition coronal portion many heliospheric models. In this paper, we perform steady-state, data-driven magnetohydrodynamic (MHD) simulations during Carrington rotation 2258...
Abstract A significant challenge facing heliospheric models is the lack of full Sun observational coverage. The information about farside photospheric magnetic field necessitates use various techniques to approximate structure and appearance this field. However, a recently developed technique that uses He ii 304 Å emission observed by Solar Terrestrial Relations Observatory (STEREO) enables developing flux proxy imaging active regions on far side Sun. Incorporating these may have potential...
Abstract The outer heliosphere is profoundly influenced by nonthermal energetic pickup ions (PUIs), which dominate the internal pressure of solar wind beyond ~10 au, surpassing both and magnetic pressures. PUIs are formed mostly through charge exchange between interstellar neutral atoms ions. This study examines apparent heating in distant supersonic before reaching heliospheric termination shock. New Horizons’ SWAP observations reveal an unexpected PUI temperature change 2015 2020, with a...
Understanding mesoscale structures in the solar wind background and coronal mass ejections (CMEs) is one of science objectives PUNCH mission to be launched early 2025. We do not fully understand what processes form these where as well how they evolve from outer corona through heliosphere. In anticipation detailed high-sensitive large field-of-view PUNCH imaging, MHD simulations capable modeling global inner heliosphere while simultaneously resolving at mesoscales can help predict we...
In preparation for the PUNCH mission which is planned to be launched in 2025, we construct synthetic white light (WL) images of inner heliosphere based on GAMERA 3D MHD output. a code whose capabilities have been extended perform time-dependent solar wind simulations by frequently updating input magnetograms and thus boundary conditions at code, offering much more realistic reconstruction propagation evolution. By employing this capability, explain phenomena structures see WL from multiple...
Abstract This study provides a detailed analysis of 14 distant interplanetary shocks observed by the Solar Wind Around Pluto instrument on board New Horizons. These were with pickup ion data cadence approximately 30 minutes, covering heliocentric distance range ∼52–60 au. All within this are fast forward shocks, and shock compression ratios vary between ∼1.2 1.9. The transition scales generally narrow, SW density compressions more pronounced compared to previous seven D. J. McComas et al. A...
Abstract Voyager 1 and 2 data from the vicinity of heliopause very local interstellar medium are reexamined to better understand confounding lack rotation in magnetic field ( B -field) across observed by both Voyagers, despite their large spatial separations (>100 au). Using three estimates for orientation -field pristine four models heliosphere, we calculate draped orientations along model heliopauses compare those observations. At expected -fields inconsistent with after boundary...
We investigate the role of 11 yr solar cycle variations in wind (SW) parameters on flows heliosheath using a new three-dimensional time-dependent model interaction between SW and interstellar medium. For boundary conditions we use realistic time latitudinal dependence obtained from SOHO/SWAN interplanetary scintillation data for last two cycles (1990–2011). This set generally agrees with situ Ulysses measurements 1991 to 2009. first ∼30 AU predicts constant radial flow speeds at Voyager 2...
Abstract The Neptune Odyssey mission concept is a Flagship-class orbiter and atmospheric probe to the Neptune–Triton system. This bold of exploration would orbit an ice-giant planet study planet, its rings, small satellites, space environment, planet-sized moon Triton. Triton captured dwarf from Kuiper Belt, twin Pluto, likely ocean world. addresses system-level science, with equal priorities placed on Neptune, moons, Between Uranus latter unique in providing simultaneous access both ice...
Abstract Variations of the magnetic field within a solar coronal mass ejection (CME) in heliosphere depend on CME’s structure as it leaves corona and its interplanetary evolution. To account for this evolution, we developed new numerical model inner that simulates propagation CME through realistic wind background allows various topologies. end, incorporate Gibson–Low our global MHD heliosphere, GAMERA-Helio. We apply to study geoeffective erupted 2010 April 3, aiming reproduce temporal...
In the heliosheath (HS), Voyager 2 has observed a flow with constant radial velocity and magnetic flux conservation. 1, however, decrease in flow's an order of magnitude flux. We investigate role 11 yr solar cycle variation field strength on within HS using global 3D magnetohydrodynamic model heliosphere. use time latitude-dependent wind density inferred from Solar Heliospheric Observatory/SWAN interplanetary scintillations data implemented variations derived 27 day averages average at 1 AU...
Abstract Magnetic reconnection in the solar corona is thought to be unstable with formation of multiple interacting plasmoids, and previous studies have shown that plasmoid dynamics can trigger MHD waves different modes propagating outward from site. However, variations plasma parameters magnetic field strength vicinity a coronal site may lead wave reflection mode conversion. In this paper we investigate refraction fast magnetoacoustic near Under justified assumption an analytically...
The recently published Interstellar Probe (ISP) study report describes a pragmatic mission concept with launch window that starts in 2036 and is expected to reach several hundreds of astronomical units past the heliopause within time frame ≥50 years ( https://interstellarprobe.jhuapl.edu/Interstellar-Probe-MCR.pdf ). Following ISP report, this paper, will also be accessible from Bulletin AAS (BAAS) framework Decadal Survey for Solar Space Physics (Heliophysics) 2024–2033 (Dialynas et al., A...
It has been proposed that particles bouncing between magnetized flows converging in a reconnection region can be accelerated by the first order Fermi mechanism. Analytical considerations of this mechanism have shown spectral index is related to total plasma compression within similarly case diffusive shock acceleration As step investigate efficiency regions producing hard energy spectra solar corona, we explore degree achieved at sites. In particular, aim determine conditions for strong...
Abstract This review summarizes our current understanding of the outer heliosphere and local interstellar medium (LISM) inferred from observations modeling interplanetary Lyman- $\alpha $ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>α</mml:mi> </mml:math> emission. The emission is produced by solar photons (121.567 nm) backscattered H atoms inflowing to LISM. Studies radiation determined parameters hydrogen within a few astronomical units Sun. appeared be decelerated,...
Abstract. Observations of streamers in extreme ultraviolet (EUV) emission with SOHO/UVCS show dramatic differences line profiles and latitudinal variations heavy ion compared to hydrogen Ly-α emission. In order use observations as the diagnostics slow solar wind properties, an adequate model a streamer including ions is required. We extended previous 2.5-D multi-species magnetohydrodynamics (MHD) coronal 3-D spherical geometry, first approach we consider tilted dipole configuration magnetic...
Abstract We discuss the synergies between heliospheric and dust science, open science questions, technological endeavours, programmatic aspects that are important to maintain or develop in decade come. In particular, we illustrate how can use interstellar solar system as a tracer for (dynamic) heliosphere properties, emphasize fairly unexplored, but potentially question of role cosmic astrospheric physics. show an probe mission with dedicated suite would bring unprecedented advances...