Effects of interplanetary coronal mass ejections on the transport of nano-dust generated in the inner solar system

O'Brien, Leela; Juhász, Á.; Sternovsky, Z.; Horányi, M.

doi:10.1016/j.pss.2017.11.013

Cited by 6 publications

(7 citation statements)

References 30 publications

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“…In particular, the solar photospheric observations and calculations of the potential field source surface did not rapidly change from one CR to the next during this period. We do note, however, that we have chosen here not to include solar flares or CMEs, which have been theoretically shown to dramatically alter the trajectories and resultant fluxes of nanodust grains in the inner heliosphere (e.g., O'Brien et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, previous work has suggested that nanodust grain production rates may be temporally variable due to changes in the theoretical boundary of the nanodust trapping region inside ≈0.2 au (Czechowski & Mann, 2010) or in the case of rapid sublimation of sungrazing comets (Ip & Yan, 2012; Jones et al, 2018); however, we do not consider these potential generation mechanisms in this study. We also do not consider the presence of any solar flares or CMEs, which are known to significantly perturb the interplanetary environment and nanodust grain charging and dynamics (e.g., Czechowski & Kleimann, 2017; O'Brien et al, 2018; Sternovsky et al, 2008). Finally, when modeling nanodust grain dynamics, some grains have lifetimes in the simulation domain that are longer than a CR period.…”

Section: Model Descriptionmentioning

confidence: 99%

“…Upon interacting with interplanetary magnetic fields (IMFs), nanodust grains will be accelerated radially outward but will also drift latitudinally, with such drifts dependent on the grain mass (more massive grains drift faster), the polarity of the heliospheric electric fields (either focusing, where interplanetary electric fields point toward the HCS, or defocusing, where electric fields point away from the HCS), and the degree of the HCS tilt (e.g., Hoeksema, 1995; Suess et al, 1993). Finally, it has also been shown that interplanetary coronal mass ejections (CMEs) can have dramatic effects on the behavior of nanodust grains, including acceleration of grain velocities up to ∼1,000 km/s and the introduction of large and temporally variable longitudinal asymmetries in nanodust fluxes (e.g., Czechowski & Kleimann, 2017; O'Brien et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Poppe

Lee

2020

JGR Space Physics

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“…Additionally, a population of very small nanometer sized dust grains can be picked up and entrained in the solar wind [e.g. Czechowski and Mann, 2010;Juhasz and Horányi, 2013;O'Brien et al 2014O'Brien et al , 2018, mass-loading the solar wind.…”

Section: Introductionmentioning

confidence: 99%

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

Szalay

Pokorný

Bale

et al. 2020

ApJS

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The Parker Solar Probe (PSP) spacecraft has flown into the most dense and previously unexplored region of our solar system's zodiacal cloud. While PSP does not have a dedicated dust detector, multiple instruments onboard are sensitive to the effects of meteoroid bombardment. Here, we discuss measurements taken during PSP's first two orbits and compare them to models of the zodiacal cloud's dust distribution. Comparing the radial impact rate trends and the timing and location of a dust impact to an energetic particle detector, we find the impactor population to be consistent with dust grains on hyperbolic orbits escaping the solar system. Assuming PSP's impact environment is dominated by hyperbolic impactors, the total quantity of dust ejected from our solar system is estimated to be 1 − 14 tons/s. We expect PSP will encounter an increasingly more intense impactor environment as its perihelion distance and semi-major axis are decreased.

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“…One class of these voltage pulses, known as "single-hits," was interpreted as being due to nanometer-seized dust particles impacting the spacecraft (SC) with high velocities (Meyer-Vernet et al, 2009). These "nanodust" particles are generated near the Sun by collisional processes and accelerated by the expanding solar wind plasma (Czechowski & Mann, 2010;Juhász & Horányi, 2013;O'Brien et al, 2017). Another subset of the STEREO dust data, known as "triple-hits," was interpreted as due to interplanetary and interstellar dust particles impacting the SC body.…”

Section: Introductionmentioning

confidence: 99%

Interpreting Dust Impact Signals Detected by the STEREO Spacecraft

2017

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There is no comprehensive understanding yet of how dust impacts on spacecraft (SC) generate signals detected by antenna instruments. The high sensitivity of the S/WAVES instrument and the large number and high diversity of dust impacts detected make the STEREO mission particularly well suited for a closer investigation. A floating perturbation model (FPP) was recently proposed to explain the characteristic shape of dust impact signals with an overshoot. The FPP model posits that the overshoot is due to the different discharge time constant of the SC and the individual antennas. Kinetic simulations are performed to demonstrate that, contrary to common belief, antennas are inefficient collectors of charged particles from impact plasmas. The collection efficiency is small, only 0.1–1%, varying weakly with the bias potential between the antenna and the SC, and more strongly with impact location. The low recollection efficiencies and an analysis of the shapes and scaling of typical and atypical signals recorded by S/WAVES suggest that, besides the mechanism described by the FPP model, there is another, possibly stronger mechanism that is responsible for generating the characteristic overshoot for most dust impact signals observed by STEREO.

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Effects of interplanetary coronal mass ejections on the transport of nano-dust generated in the inner solar system

Cited by 6 publications

References 30 publications

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

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

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

Interpreting Dust Impact Signals Detected by the STEREO Spacecraft

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