A5011777253- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Solar Radiation and Photovoltaics
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Atmospheric Ozone and Climate
- Geomagnetism and Paleomagnetism Studies
- Advanced Thermodynamics and Statistical Mechanics
- History and Developments in Astronomy
- Quantum, superfluid, helium dynamics
- CCD and CMOS Imaging Sensors
- Adaptive optics and wavefront sensing
- Statistical Mechanics and Entropy
- Space Exploration and Technology
- Earthquake Detection and Analysis
- Geology and Paleoclimatology Research
California Institute of Technology
2013-2024
Aberystwyth University
2023
University of California, Santa Cruz
2013
University of Arizona
2013
Abstract On 2022 September 5, Parker Solar Probe (Parker) observed a large solar energetic particle (SEP) event at the unprecedented distance of only 15 R S from Sun. The observations Integrated Science Investigation Sun (IS⊙IS) obtained over course this are remarkably rich, and an overview is presented here. IS⊙IS capable measuring ions 20 keV to 100 MeV nuc −1 electrons 30 6 MeV; here, we primarily focus on proton helium measurements above 80 keV. Among surprising results evidence inverse...
Abstract We develop the kappa-tail fitting technique, which analyzes observations of power-law tails distributions and energy flux spectra, connects them to theoretical modeling kappa distributions, determine thermodynamics examined space plasma. In particular, we (i) construct associated mathematical formulation; (ii) prove its decisive lead for determining whether observed is with distributions; (iii) provide a validation technique using pseudo-observations typical input plasma parameters....
Abstract In this paper, we model the high-energy tail of observed solar energetic proton energy distributions with a kappa distribution function. We employ technique for deriving thermodynamic parameters populations measured by Parker Solar Probe Integrated Science Investigation Sun EPI-Hi telescope, over energies from 10 to 60 MeV. With technique, explore, first time, characteristic properties protons associated an interplanetary coronal mass ejection (ICME) and its driven shock. find that:...
Abstract The 2021 October 28 solar energetic particle (SEP) event was a rare ground level enhancement (GLE) event, where secondary particles from the interactions of SEPs with Earth’s atmosphere were detected by neutron monitors on ground. A number papers have examined signatures, monitor observations, and characteristics SEP protons electrons for this event. Here we describe heavy ion specifically O Fe, observed multiple spacecraft. Parker Solar Probe, Terrestrial Relations...
Abstract In the latter moments of 2023 July 17, solar active region (AR) 13363, near southwestern face Sun, was undergoing considerable evolution, which resulted in a significant energetic particle (SEP) event measured by Parker Solar Probe’s Integrated Science Investigation Sun (IS⊙IS) and near-Earth spacecraft. Remote observations from GOES CHASE captured two M5.0+ flares that peaked at 23:34 00:06 UT source region. tandem, STEREO COR2 first recorded small, narrow coronal mass ejection...
During mid-May 2024, active region (AR) 13664 produced a series of M- and X-class flares along with several coronal mass ejections (CMEs) which resulted in exceptionally strong aurora at Earth. This study presents in-situ solar energetic particle (SEP) ion composition data from STEREO-A, ACE Parker Solar Probe (PSP) as their connectivity to AR varied throughout the great storm period. The observational period was between 08 20 May, STEREO-A 12° longitudinally separated 0.96...
Abstract In this study, we employ the combined charged particle measurements from Integrated Science Investigation of Sun on board Parker Solar Probe (PSP) and Energetic Particle Detector Orbiter (SolO) to study composition variation solar energetic (SEP) event occurring 2023 May 16. During event, SolO PSP were located at a similar radial distance ∼0.7 au separated by ∼60° in longitude. The footpoints both west flare region, but former was much closer (18° versus 80°). Such distribution...
Abstract Spectroscopic measurements of the low solar corona are crucial to understanding mechanisms that heat and accelerate wind, yet lowest radii ( $R_{\odot }$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>R</mml:mi> <mml:mo>⊙</mml:mo> </mml:msub> </mml:math> ) difficult observe. Our expedition collected narrow wavelengths visible light at 530.3, 637.4, 789.2 nm emitted by Fe xiv , x xi ions, respectively, from total eclipse on 2019 July 2 20:40 UTC in...
Abstract A new instrument was designed to take visible-light (VL) polarized brightness ( $\mathit{pB}$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>pB</mml:mi> </mml:math> ) observations of the solar corona during 14 December 2020 total eclipse. The instrument, called Coronal Imaging Polarizer (CIP), consisted a 16 MP CMOS detector, linear polarizer housed within piezoelectric rotation mount, and an f-5.6, 200 mm DSLR lens. Observations were successfully obtained,...
We report on multi-spacecraft measurements of a solar energetic particle (SEP) event that occurred 13 March 2023. The Parker Solar Probe (PSP) mission was situated the far side Sun as seen from Earth at radial distance only 49 radii and observed very strong including associated CME its shock passing over spacecraft four hours after eruption. Orbiter, BepiColombo, STEREO A, near-Earth spacecraft, MAVEN Mars were all within 50 degrees in longitude, well, proving widespread character. Clear...
During Parker Solar Probe&#8217;s 16th orbit, two solar energetic particle (SEP) events were detected by the Integrated Science Investigation of Sun (IS&#664;IS). The spacecraft measuring these SEP oriented near-perfectly along same nominal spiral magnetic field line which connected Earth to source for ambient wind speeds. Both also observed STEREO and ACE, provided opportunity examine how velocity dispersion, CME shock arrival, energy spectra, elemental composition varied during...
We develop the kappa-tail fitting technique, which analyzes observations of power-law tails distributions and energy-flux spectra connects them to theoretical modeling kappa distributions, determine thermodynamics examined space plasma. In particular, we (i) construct associated mathematical formulation, (ii) prove its decisive lead for determining whether observed is with distributions; (iii) provide a validation technique using pseudo-observations typical input plasma parameters. Then,...
In this paper we model the high-energy tail of observed solar energetic proton energy distributions with a kappa distribution function. We employ technique for deriving thermodynamic parameters populations measured by Parker Solar Probe (PSP) Integrated Science Investigation Sun (IS$\odot$IS) EPI-Hi high telescope (HET), over energies from 10 - 60 MeV. With explore, first time, characteristic properties protons associated an interplanetary coronal mass ejection (ICME) and its driven shock....
In this study, we employ the combined charged particle measurements from Integrated Science Investigation of Sun (\ISOIS) onboard Parker Solar Probe (PSP) and Energetic Particle Detector (EPD) Orbiter (SolO) to study composition variation solar energetic (SEP) event occurring on May 16, 2023. During event, SolO PSP were located at a similar radial distance ~0.7 au separated by $\sim$60$^\circ$ in longitude. The footpoints both west flare region but former was much closer (18$^\circ$ vs...
Observations of plasma motions in the low corona are often limited to magnetic field lines originating active regions, which ideal for spatial domain enhancements across individual extreme ultraviolet (EUV) images see loops, flares, and other bright activity contrasted against dim background features.The quiet Sun is essentially all features, requires advanced image processing observation parameters emphasize temporal order visualize faint, fine-scale flows. We utilize time-normalized...
Many aspects of the solar atmosphere remain poorly understood, including mechanisms at work to heat plasma a million degrees. Spectroscopy is key probing this extreme environment. After brief introduction scientific questions, and observational difficulties, I will present details high-resolution spectrometer designed built Aberystwyth with international collaborators. The has been tested during total eclipse 2019 in Argentina, from which preliminary results. Future developments, potential...
&lt;p&gt;High-resolution spectral diagnostic data gathered from the total solar eclipse in Neuquen, Argentina provided a rare glimpse of Fe X, XI, XIV ions approximately ~110 minues after initial plasma eruption that led to near side coronal mass ejection (CME). The iron ion represents equilibrium temperatures 0.9 1.9 MK and lower Mg I prominences were also observed. We present well constrained temperature map both sides corona, where CME occurred opposite which is relatively...