The Near-Sun Dust Environment: Initial Observations from Parker Solar Probe

Szalay, J. R.; Pokorný, Petr; Bale, S. D.; Christian, E. R.; Goetz, K.; Goodrich, K.; Hill, M. E.; Kuchner, Marc J.; Larsen, Rhiannon; Malaspina, D.; McComas, D. J.; Mitchell, D. G.; Page, Brent; Schwadron, N. A.

doi:10.3847/1538-4365/ab50c1

Cited by 67 publications

(69 citation statements)

References 80 publications

(94 reference statements)

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“…In the innermost region of our Solar System, the Parker Solar Probe instrumentation has already reported impacts by very small dust particles which seem to be consistent with the existence of a dust population on hyperbolic trajectories, i.e. β-meteoroids (Mann et al 2019;Szalay et al 2020a). Although the mass influx of these dust particles represent, most likely, a minor contribution to the formation of exosphere of airless bodies, it could be responsible for some effects such as the night-day asymmetry observed by LADEE on the lunar dust cloud (Szalay et al 2020b) and they can impose constraints on the size distribution of mass-dominant meteoroids (Fig.…”

Section: Future Of the Fieldsupporting

confidence: 64%

Meteoroids as One of the Sources for Exosphere Formation on Airless Bodies in the Inner Solar System

et al. 2021

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This manuscript represents a review on progress made over the past decade concerning our understanding of meteoroid bombardment on airless solar system bodies as one of the sources of the formation of their exospheres. Specifically, observations at Mercury by MESSENGER and at the Moon by LADEE, together with progress made in dynamical models of the meteoroid environment in the inner solar system, offer new tools to explore in detail the physical phenomena involved in this complex relationship. This progress is timely given the expected results during the next decade that will be provided by new missions such as DESTINY+, BepiColombo, the Artemis program or the Lunar Gateway.

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Section: Future Of the Fieldsupporting

confidence: 64%

Meteoroids as One of the Sources for Exosphere Formation on Airless Bodies in the Inner Solar System

et al. 2021

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“…Among the many reports of interplanetary dust observations, there is now an extensive body of literature describing the implicit detection of planetary, interplanetary, and interstellar dust grains by radio wave antennas, due to spacecraft potential perturbations induced by hypervelocity IDP impacts on spacecraft bodies. Radio wave antenna detections of dust impacts have been observed by Wind (Kellogg et al, 2016; Malaspina & Wilson, 2016; Malaspina et al, 2014; Wood et al, 2015), Cassini (e.g., Kurth et al, 2006; Wang et al, 2006), STEREO A and B (e.g., Malaspina et al, 2015; Meyer‐Vernet et al, 2009), MAVEN (Andersson et al, 2015), Voyager 1 and 2 (Gurnett et al, 1997; Wang, 2004), and Parker Solar Probe (e.g., Malaspina et al, 2020; Mozer et al, 2020; Page et al, 2020; Szalay et al, 2020). These detections span the solar system from distances <0.25 au as observed by Parker Solar Probe to >70 au as observed by Voyagers 1 and 2.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Solar Wind Structure on Nanodust Dynamics in the Inner Heliosphere

Poppe

Lee

2020

JGR Space Physics

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Several interplanetary spacecraft have inferred the presence of nanometer-sized dust grains in the inner heliosphere accelerated to near-solar wind velocities based on observations by radio wave antennas. These "nanodust" grains exhibit unique behavior in interplanetary space as they are strongly affected by both the solar gravitational force and the electromagnetic Lorentz force from the convecting interplanetary magnetic field. Here, we study the dynamics of nanodust grains in the inner heliosphere via a combination of background electromagnetic fields from the coupled Wang-Sheeley-Arge/Enlil heliospheric model and a nanodust grain charging and dynamics model. The model results predict strong time variability in the nanodust velocity and flux distributions at 1 au within a single Carrington rotation (CR) driven by a combination of nanodust grain size, heliospheric current sheet tilt, and varying heliospheric plasma parameters. In contrast, the general character of nanodust dynamics does not drastically change from one CR to the next. Despite including observationally driven heliospheric plasma conditions, the modeled nanodust impact rates do not agree with in situ observations by the STEREO A and B WAVES instruments, especially with regard to CR-to-CR variability. We interpret this data-model disagreement as evidence that additional time variability must be present in the production rate of nanodust grains in the inner heliosphere. We discuss possibilities for this time variability, including non-steady-state collisional cascades, variability in nanodust trapping regions, and the impulsive disruption of inner solar system comets and/or asteroids.

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“…This L31 hole resulted in elevated photon background in one look direction but at a level that has not diminished EPI-Lo's scientific capabilities. This dust impact is discussed in more detail by Szalay et al (2020).…”

Section: Epi-lo Ion Measurements and The Effects Of Photonsmentioning

confidence: 98%

Small, Low-energy, Dispersive Solar Energetic Particle Events Observed by Parker Solar Probe

Hill

Mitchell

Allen

et al. 2020

ApJS

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The Energetic Particle Instrument-Low Energy (EPI-Lo) experiment has detected several weak, low-energy (∼30-300 keV nucleon-1) solar energetic particle (SEP) events during its first two closest approaches to the Sun, providing a unique opportunity to explore the sources of low-energy particle acceleration. As part of the Parker Solar Probe (PSP) Integrated Science Investigation of the Sun (ISeIS) suite, EPI-Lo was designed to investigate the physics of energetic particles; however, in the special lowest-energy "time-of-flight only" product used in this study, it also responds to solar photons in a subset of approximately sunward-looking apertures lacking special light-attenuating foils. During the first three perihelia, in a frame rotating with the Sun, PSP undergoes retrograde motion, covering a 17°heliographic longitudinal range three times during the course of the ∼11-day perihelion passes, permitting a unique spatial and temporal study into the location, correlation, and persistence of previously unmeasurable SEPs. We examine the signatures of these SEPs (during the first PSP perihelion pass only) and the connection to possible solar sources using remote observations from the Solar Dynamics Observatory (SDO), the Solar TErrestrial RElations Observatory (STEREO), and the ground-based Global Oscillation Network Group (GONG). The orientation of the Sun relative to STEREO, SDO, and GONG makes such identifications challenging, but we do have several candidates, including an equatorial coronal hole at a Carrington longitude of ∼335°. To analyze observations from EPI-Lo, which is a new type of particle instrument, we examine instrumental effects and provide a preliminary separation of the ion signal from the photon background.

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The Near-Sun Dust Environment: Initial Observations from Parker Solar Probe

Cited by 67 publications

References 80 publications

Meteoroids as One of the Sources for Exosphere Formation on Airless Bodies in the Inner Solar System

Meteoroids as One of the Sources for Exosphere Formation on Airless Bodies in the Inner Solar System

The Effects of Solar Wind Structure on Nanodust Dynamics in the Inner Heliosphere

Small, Low-energy, Dispersive Solar Energetic Particle Events Observed by Parker Solar Probe

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