A5052232645- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Solar Radiation and Photovoltaics
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Astrophysics and Cosmic Phenomena
- Spacecraft Design and Technology
- Earthquake Detection and Analysis
- Space Satellite Systems and Control
- Atmospheric Ozone and Climate
- Distributed and Parallel Computing Systems
- Dark Matter and Cosmic Phenomena
- Photovoltaic System Optimization Techniques
- Space Science and Extraterrestrial Life
- Magnetic confinement fusion research
- Neutrino Physics Research
- Space exploration and regulation
- Computational Fluid Dynamics and Aerodynamics
- GNSS positioning and interference
- Inertial Sensor and Navigation
- Radiation Therapy and Dosimetry
Goddard Space Flight Center
2016-2025
Pázmány Péter Catholic University
2025
Heliophysics
2012-2024
Heliophysics Science Division
2020-2024
National Aeronautics and Space Administration
2006-2022
Budapest University of Technology and Economics
2022
Massachusetts Institute of Technology
1989-2021
1366 Technologies (United States)
2021
University of Michigan
2021
Institute of Molecular Biology of the Slovak Academy of Sciences
2017
Solar Probe Plus (SPP) will be the first spacecraft to fly into low solar corona. SPP’s main science goal is determine structure and dynamics of Sun’s coronal magnetic field, understand how corona wind are heated accelerated, what processes accelerate energetic particles. Understanding these fundamental phenomena has been a top-priority for over five decades, dating back 1958 Simpson Committee Report. The scale concept such mission revised at intervals since that time, yet core always close...
The Solar Wind Electrons Alphas and Protons (SWEAP) Investigation on Probe Plus is a four sensor instrument suite that provides complete measurements of the electrons ionized helium hydrogen constitute bulk solar wind coronal plasma. SWEAP consists Cup (SPC) Analyzers (SPAN). SPC Faraday looks directly at Sun measures ion electron fluxes flow angles as function energy. SPAN an electrostatic analyzer (ESA) ram side SPP (SPAN-A) ESA anti-ram (SPAN-B). SPAN-A has time flight section enables it...
Abstract Launched on 12 Aug. 2018, NASA’s Parker Solar Probe had completed 13 of its scheduled 24 orbits around the Sun by Nov. 2022. The mission’s primary science goal is to determine structure and dynamics Sun’s coronal magnetic field, understand how solar corona wind are heated accelerated, what processes accelerate energetic particles. returned a treasure trove data that far exceeded quality, significance, quantity expectations, leading significant number discoveries reported in nearly...
The Whole Sun Month campaign (August 10 to September 8, 1996) brought together a wide range of space‐based and ground‐based observations the interplanetary medium during solar minimum. wealth data collected provides unique opportunity for testing coronal models. We develop three‐dimensional magnetohydrodynamic (MHD) model corona (from 1 30 radii) applicable WSM time period, using measurements photospheric magnetic field as boundary conditions calculation. compare results from computation...
This work discusses the relations among (1) an interplanetary force‐free magnetic cloud containing a plug of cold high‐density material with unusual composition, (2) coronal mass ejection (CME), (3) eruptive prominence, and (4) model prominence supported by flux rope in streamer. The moved past Wind spacecraft located solar wind upstream Earth on January 10 11, 1997. field configuration was approximately constant‐α, rope. 4 He ++ /H + abundance most similar to that streamer belt material,...
We present a comprehensive observational study of the magnetospheric response to an interplanetary magnetic field (IMF) tangential discontinuity, which first struck postnoon bow shock and magnetopause then swept past prenoon on July 24, 1996. Although unaccompanied by any significant plasma variation, discontinuity interacted with form hot flow anomaly (HFA), was observed Interball‐1 just upstream from shock. Pressures within Earthward HFA were depressed order magnitude, allowed briefly (∼7...
Abstract. Interplanetary magnetic clouds (MCs) have been identified for the first 8.6 years of WIND mission, and their field structures parameter-fitted by a static, force free, cylindrically-symmetric model (Lepping et al., 1990) with various levels success. This paper summarizes aspects results fitting providing: seven estimated fit-parameter values each 82 MCs found, objectively determined quality estimates, closest approach vectors (in two coordinate frames), errors cases acceptable (50...
We use combined high-cadence, high-resolution, and multi-point imaging by the Solar-Terrestrial Relations Observatory (STEREO) Solar Heliospheric to investigate hour-long eruption of a fast wide coronal mass ejection (CME) on 2011 March 21 when twin STEREO spacecraft were located beyond solar limbs. analyze relation between CME, evolution an Extreme Ultraviolet (EUV) wave, onset energetic particle (SEP) event measured in situ near-Earth orbiting spacecraft. Combined ultraviolet white-light...
Analysis of MESSENGER magnetic field observations taken in the southern lobe Mercury's magnetotail and adjacent magnetosheath on 11 April 2011 indicates that a total 163 flux transfer events (FTEs) occurred within 25 min interval. Each FTE had duration ∼2–3 s was separated time from next by ∼8–10 s. A range values have been reported at Earth, with mean near ∼1–2 ∼8 min, respectively. We term these intervals quasiperiodic “FTE showers.” The northward sunward orientation interplanetary during...
The structure of magnetic flux ropes injected into the solar wind during reconnection in coronal atmosphere is explored with particle-in-cell simulations and compared situ measurements "switchbacks" from Parker Solar Probe. We suggest that multi-x-line between open closed corona injects these convect outward over long distances before eroding due to reconnection. Simulations explore reproduce following key features switchback observations: a rapid rotation radial field transverse direction,...
Magnetic reconnection in current sheets converts magnetic energy into particle energy. The process may play an important role the acceleration and heating of solar wind close to Sun. Observations from Parker Solar Probe provide a new opportunity study this problem, as it measures at unprecedented distances During 1st orbit, PSP encountered large number through perihelion 35.7 radii. We performed comprehensive survey these found evidence for 21 exhausts. These exhausts were observed...
Abstract The Wind spacecraft, launched on November 1, 1994, is a critical element in NASA’s Heliophysics System Observatory (HSO)—a fleet of spacecraft created to understand the dynamics Sun‐Earth system. combination its longevity (>25 years service), diverse complement instrumentation, and high resolution accurate measurements has led it becoming “standard candle” solar wind measurements. over 55 selectable public data products with ∼1,100 total variables (including OMNI products)...
HelioSwarm (HS) is a NASA Medium-Class Explorer mission of the Heliophysics Division designed to explore dynamic three-dimensional mechanisms controlling physics plasma turbulence, ubiquitous process occurring in heliosphere and plasmas throughout universe. This will be accomplished by making simultaneous measurements at nine spacecraft with separations spanning magnetohydrodynamic sub-ion spatial scales variety near-Earth plasmas. In this paper, we describe scientific background for HS...
Abstract During the thirteenth encounter of Parker Solar Probe (PSP) mission, spacecraft traveled through a topologically complex interplanetary coronal mass ejection (ICME) beginning on 2022 September 5. PSP traversed flank and wake ICME while observing event for nearly two days. The ANalyzer FIELDS instruments collected in situ measurements plasma particles magnetic field at ∼13.3 R S from Sun. We observe classical signatures, such as fast-forward shock, bidirectional electrons, low proton...
Small‐scale magnetic flux ropes have been discovered in the solar wind at 1 AU observations from IMP 8 and WIND spacecraft. These small structures (diameter of 270 R E , on average) some similar properties to clouds (diameters 0.2–0.3 or about 6000–8000 ), which are well known large‐scale ropes, but durations 10s minutes as opposed many hours days for most clouds. The presence these helical field suggests that may a wide‐range scale sizes, possibly bimodal size distribution, perhaps more...
Late on October 18, 1995, a magnetic cloud arrived at the Wind spacecraft ≈ 175 R E upstream of Earth. The had an intense interplanetary field that varied slowly in direction, from being strongly southward to northward during its 30 hours duration, and low proton temperature throughout. From linear force free model was shown have flux rope line geometry, estimated diameter about 0.27 AU, axis aligned with Y axis(GSE) within 25°. A corotating stream, which large amplitude Alfven waves 0.5...
We present techniques for comparing measurements of velocity, temperature, and density with constraints imposed by the plasma physics magnetized bi‐Maxwellian ions. Deviations from these physics‐based are interpreted as arising measurement errors. Two million ion spectra Solar Wind Experiment Faraday Cup instruments on spacecraft used a case study. The accuracy velocity is determined fact that differential flow between hydrogen helium should be aligned ambient magnetic field. Modeling...
Images of the solar corona obtained by Solar-Terrestrial Relations Observatory (STEREO) provide high-cadence, high-resolution observations a compression wave forming ahead fast (940 km s−1) coronal mass ejection (CME) that erupted at ∼9:00 UT on 2010 April 03. The passage this 1 AU is detected in situ Advanced Composition Explorer and Wind spacecraft 08:00 05 as shock followed turbulent heated sheath. These unprecedented complementary shock–sheath region from Sun to are used investigate...
ABSTRACT In this paper, we present evidence for magnetic transients with small radial extents ranging from 0.025 to 0.118 AU measured in situ by the Solar-Terrestrial Relations Observatory ( STEREO ) and near-Earth Advanced Composition Explorer ACE Wind spacecraft. The considered study are much smaller (<0.12 AU) than typical sizes of clouds near 1 (∼0.23 AU). They marked low plasma beta values, generally lower field variance, short timescale rotations, all entrained high-speed streams...