A5020721624- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Geophysics and Gravity Measurements
- Solar Radiation and Photovoltaics
- Space exploration and regulation
- Plant Pathogens and Fungal Diseases
- Space Exploration and Technology
- Earthquake Detection and Analysis
- Geological and Geophysical Studies
- Banana Cultivation and Research
- Currency Recognition and Detection
- Market Dynamics and Volatility
- Monetary Policy and Economic Impact
- Sunflower and Safflower Cultivation
- Geophysical and Geoelectrical Methods
- Magnetic and Electromagnetic Effects
- Spaceflight effects on biology
- Economic Growth and Productivity
Goddard Space Flight Center
2023-2024
George Mason University
2023-2024
Heliophysics
2023-2024
University of Helsinki
2021-2022
Indian Institute of Science Education and Research Kolkata
2017-2022
Sardar Vallabhbhai Patel University of Agriculture & Technology
2020
Abstract On 2022 February 15, an impressive filament eruption was observed off the solar eastern limb from three remote-sensing viewpoints, namely, Earth, STEREO-A, and Solar Orbiter. In addition to representing most-distant at extreme ultraviolet wavelengths—captured by Orbiter's field of view extending above 6 R ⊙ —this event also associated with release a fast (∼2200 km s −1 ) coronal mass ejection (CME) that directed toward BepiColombo Parker Probe. These two probes were separated 2° in...
Abstract On 3 February 2022, SpaceX launched 49 Starlink satellites, 38 of which unexpectedly de‐orbited. Although this event was attributed to space weather, definitive causality remained elusive because weather conditions were not extreme. In study, we identify solar sources the interplanetary coronal mass ejections that responsible for geomagnetic storms around time launch satellites and first time, investigate their impact on Earth's magnetosphere using magnetohydrodynamic modeling. The...
Solar flares create adverse space weather impacting and Earth-based technologies. However, the difficulty of forecasting flares, by extension severe weather, is accentuated lack any unique flare trigger or a single physical pathway. Studies indicate that multiple properties contribute to active region potential, compounding challenge. Recent developments in machine learning (ML) have enabled analysis higher-dimensional data leading increasingly better techniques. consensus on high-performing...
The solar wind is permeated by Alfvénic fluctuations across a broad range of scales, with that have an anti-sunward sense propagation typically dominating.  Recent studies shown cross helicity, which can be used to measure the difference between sunward and fluctuation power, more balanced inside interplanetary coronal mass ejections (ICMEs) than in generally.  A possible cause helicity ICMEs their closed magnetic field structure, loop connected at both ends Sun...
Magnetic ejecta (ME) characterized by large-scale smoothly-rotating magnetic field lines inside interplanetary coronal mass ejections (ICMEs) may erode while interacting with the surrounding ambient solar wind plasma in heliosphere. Erosion occur ICME-surrounding structures are favorable conditions leading to reconnection MEs. peel off outer layers of ME eventually changes their and properties. In this study, we analyze erosion three ICME events observed very rare radial alignments multiple...
Context. Magnetic clouds (MCs) are transient structures containing large-scale magnetic flux ropes from solar eruptions. The twist of field lines around the rope axis reveals information about formation processes and geoeffectivity. During propagation MC may erode via reconnection with ambient wind. Any erosion reduces helicity ropes, changes their cross-sectional profiles. Aims. This study relates profiles in observed at 1 AU to amount undergone by MCs interplanetary space. Methods. two...
Streamer-blowout coronal mass ejections (SBO-CMEs) are the dominant CME population during solar minimum. Although they typically slow and lack clear low-coronal signatures, can cause geomagnetic storms. With aid of extrapolated fields remote observations off-limb low corona, we study initiation an SBO-CME preceded by consecutive eruptions consistent with a multi-stage sympathetic breakout scenario. From inner-heliospheric Parker Solar Probe (PSP) observations, it is evident that interacting...
Stealth coronal mass ejection (CMEs) are eruptions from the Sun that not associated with appreciable low-coronal signatures. Because they often cannot be linked to a well-defined source region on Sun, analysis of their initial magnetic configuration and eruption dynamics is particularly problematic. In this manuscript, we address issue by undertaking first attempt at predicting fields stealth CME erupted in 2020 June Earth-facing Sun. We estimate its aid off-limb observations secondary...
Coronal Mass Ejections (CMEs) are energetic storms in the Sun that result ejection of large-scale magnetic clouds (MCs) interplanetary space contain enhanced fields with coherently changing field direction. The severity geomagnetic perturbations depends on direction and strength (IMF), as well speed duration passage storm. coupling between heliospheric environment Earth's magnetosphere is strongest when IMF persistently southward for a prolonged period. Predicting profile such Earth-directed...
From 29 January to 7 February 2022, the heliosphere was structured with large-scale interacting substructures that appeared significant dissimilarities at distant observations separated longitudinally by <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="m1"><mml:mo>∼</mml:mo><mml:mn>34</mml:mn><mml:mo>°</mml:mo></mml:math> . Probing complexity of multi-point in situ and imaging using a fleet spacecraft has revealed many unknown facts on dynamics structures heliosphere. In this...
Magnetic clouds (MCs) are flux-rope magnetic structures forming a subset of solar coronal mass ejections which have significant space weather impacts. The geoeffectiveness MCs depends on their properties evolve during interplanetary passage. Based an analysis observations spanning two cycles we establish that interacting with the ambient wind field (i.e., heliospheric open flux) lose substantial amount initial flux via reconnection, in some cases, reduce geoeffectiveness. We find linear...
Magnetic helicity, an intrinsic property of eruptive helical flux ropes (FRs) forming coronal mass ejections (CMEs), plays important role in determining CME geoeffectiveness. In the solar atmosphere and heliosphere, helicity remains conserved a closed volume. Considering this fact as basis our study, we perform quantitative comparison between total magnetic twisted interplanetary CMEs those transported to via reconnection at low corona. At source, twisted/poloidal (ϕpcme) is directly...
Detecting large-scale flux ropes (FRs) embedded in interplanetary coronal mass ejections (ICMEs) and assessing their geoeffectiveness are essential since they can drive severe space weather. At 1 au, these FRs have an average duration of day. Their most common magnetic features large, smoothly rotating fields. manual detection has become a relatively practice over decades, although visual be time-consuming subject to observer bias. Our study proposes pipeline that utilizes two supervised...
Abstract This study addresses the limitations of single‐viewpoint observations Coronal Mass Ejections (CMEs) by presenting results from a 3D catalog 360 CMEs during solar cycle 24, fitted using Graduated Cylindrical Shell (GCS) model. The data set combines 326 previously analyzed and 34 newly examined events, categorized their source regions into active region (AR) eruptions, prominence (AP) eruptions (PE). Estimates errors are made bootstrapping approach. findings highlight that average...
Abstract We compare the magnetic helicity in 2013 March 17–18 interplanetary coronal mass ejection (ICME) flux rope at 1 au and its solar counterpart. The progenitor (CME) erupted on 15 from NOAA active region 11692 is associated with an M1.1 flare. derive source reconnection using post-eruption arcade (PEA) method that uses photospheric magnetogram area under PEA. geometrical properties of near-Sun obtained by forward-modeling white-light CME observations. Combining flux, we extract rope....
Coronal mass ejections (CMEs) are large eruptions from the Sun that propagate through heliosphere after launch. Observational studies of these transient phenomena usually based on 2D images Sun, corona, and (remote-sensing data), as well magnetic field, plasma, particle samples along a 1D spacecraft trajectory (in-situ data). Given scales involved 3D nature CMEs, such measurements generally insufficient to build comprehensive picture, especially in terms local variations overall geometry...
Abstract The near-Sun kinematics of coronal mass ejections (CMEs) determine the severity and arrival time associated geomagnetic storms. We investigate relationship between deprojected speed kinetic energy CMEs magnetic measures their solar sources, reconnection flux eruptive events, intrinsic flux-rope characteristics. Our data covers period 2010–2014 in cycle 24. Using vector magnetograms source active regions, we estimate size nonpotentiality. compute total at regions using post-eruption...
Sheaths ahead of interplanetary coronal mass ejections (ICMEs) are turbulent heliospheric structures. Knowledge their structure and fluctuations is important for understanding geoeffectiveness, role in accelerating particles, the interaction ICMEs with solar wind. We studied observations from Parker Solar Probe a sheath observed at 0.5 au March 2019, slow streamer blowout CME. To examine MHD-scale properties, we calculated fluctuation amplitudes, magnetic compressibility, partial variance...
On 2022 February 15, an impressive filament eruption was observed off the solar eastern limb from three remote-sensing viewpoints, namely Earth, STEREO-A, and Solar Orbiter. In addition to representing most-distant at extreme ultraviolet wavelengths -- captured by Orbiter's field of view extending above 6 $R_{\odot}$ this event also associated with release a fast ($\sim$2200 km$\cdot$s$^{-1}$) coronal mass ejection (CME) that directed towards BepiColombo Parker Probe. These two probes were...
This study addresses the limitations of single-viewpoint observations Coronal Mass Ejections (CMEs) by presenting results from a 3D catalog 360 CMEs during solar cycle 24, fitted using GCS model. The dataset combines 326 previously analyzed and 34 newly examined events, categorized their source regions into active region (AR) eruptions, prominence (AP) eruptions (PE). Estimates errors are made bootstrapping approach. findings highlight that average speed is $\sim$1.3 times greater than 2D...
Coronal mass ejections (CMEs) undergo erosion, deflection, and deformation upon interaction with the solar wind structures other transients during their propagation in corona heliosphere. In this work, we focus on process of erosion CMEs heliosphere, which impacts magnetic flux content, its effect altering geo-effectiveness. To quantify CME various environments, employ 3D magnetohydrodynamic (MHD) simulations.&#160; create a simulated background resembling minimum period (for simplistic...
<title>Abstract</title> Decades of in-situ solar wind measurements have clearly established variations in physical parameters. These variable parameters been used to classify the magnetized plasma into different types with several classification schemes being developed using these schemes, while useful for understanding wind’s originating processes at Sun and early detection space weather events, left open questions regarding which are most how recent advances our transients impact...