Dust Near The Sun

Mann, Ingrid; Kimura, Hiroshi; Biesecker, D. A.; Tsurutani, B. T.; Grün, E.; McKibben, R. B.; Liou, J.‐C.; MacQueen, R. M.; Mukai, T.; Guhathakurta, M.; Lamy, Philippe

doi:10.1023/b:spac.0000023440.82735.ba

Cited by 146 publications

(139 citation statements)

References 76 publications

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“…The values listed in Table II of this reference show that in some cases dust particles may approach the Sun as close as a distance of 2 solar radii. A likely value of the extension of the dust-free zone around the Sun, that agrees with dust composition models as well as with some observational results, is that a large fraction of the dust comes near the Sun inward to 4 solar radii (Mann et al 2004). Figure 5 of Krivov et al (1998) illustrates the sublimation history of typical dust grains near the Sun.…”

Section: Dust Destructionsupporting

confidence: 78%

“…The dust sublimation rate increases quickly when a critical temperature is reached and then the dust lifetime is shorter than the orbital period of dust in Keplerian orbit-this is usually assumed as the dust-free zone. Mann et al (2004) compiled different estimates of the dust sublimation zones. The values listed in Table II of this reference show that in some cases dust particles may approach the Sun as close as a distance of 2 solar radii.…”

Section: Dust Destructionmentioning

confidence: 99%

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Formation and Acceleration of Nano Dust in the Inner Heliosphere

Czechowski

Mann

2010

ApJ

132

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We study the dynamics of nano dust grains in the region inward from 1 AU. Assuming that the grains are created with the velocities close to Keplerian, we find that, despite the strong coupling to magnetic field, there is a population of trapped nano grains within about 0.2 AU from the Sun. The nano dust grains produced outside of the trapped region are accelerated to high velocities, of the order of 300 km s −1 , provided that the charge to mass ratio is not much less than 10 −5 e/m p . These values correspond to dust sizes equal or smaller than approximately 10 nm.

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Section: Dust Destructionsupporting

confidence: 78%

Section: Dust Destructionmentioning

confidence: 99%

Formation and Acceleration of Nano Dust in the Inner Heliosphere

Czechowski

Mann

2010

ApJ

132

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“…The relative proportions of asteroidal and cometary component in the zodiacal cloud is still an open issue. The IDP abundances are given by zodiacal light measurements, by meteoroid impacts onto spacecraft dust sensors (Mann & Grün 1995;Mann et al 1996;Mann 2004), and by samples collected by high altitude aircraft in the stratosphere (Love & Brownlee 1993;Zolesky et al 1994;Flynn 2002). Dust particles originating from comets generally have much higher Earth approaching and atmospheric entry velocities than those of asteroidal grains, but the number of Earth-crossing comets per year are considerably fewer than near-Earth asteroids (Weissman 2007).…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of the flux of micrometeoroids at Mercury from both cometary and asteroidal components

Borin

Cremonese

Marzari³

2016

A&A

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Context. Meteoroid impacts are an important source of neutral atoms for the exosphere of Mercury. We previously estimated the contribution of meteoroids originating in the asteroid belt for vapor release. In this paper, we concentrate on the cometary component of particles impacting the planet. Comets and asteroids are considered to be the two major sources of interplanetary dust particles in the solar system. The debate about which source contributes most to dust populating the solar system is still ongoing. Aims. In this work, we compute the orbital evolution of dust particles produced by Jupiter-family comets (JFC) via N-body numerical integrations. From our numerical simulations, we compute the fraction of particles hitting Earth and Mercury's surface and the corresponding distribution of impact velocities. According to some authors more than 80% of all the incoming mass of meteoroids entering the Earth's atmosphere is concentrated in the mass range 10 −7 −10 −3 g. In our model, we considered a slightly different range, 10 −9 to 10 −6 g, to include possible uncertainty. Methods. The orbital evolution of dust particles of different sizes is computed with a numerical integration code, which includes the effects of Poynting-Robertson drag, solar wind drag, and planetary perturbations. Results. By comparing the impact frequency of grains evolving either from main belt asteroids or JFC we find that the cometary component is significantly less efficient in releasing dust particles on Mercury than on the Earth. The opposite occurs in the case of dust coming from the main belt with a flux higher at Mercury than on the Earth. This is mostly due to the different dynamical histories of the grains from their release until impact. This may have important implications for the vapor production rate on Mercury. We compare our results with previous estimates given by different authors.

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“…That dust exists in interplanetary space in various forms is a well known fact (cf., e.g. Grün et al, 2011;Kempf et al, 2003;Mann et al, 2004;Krüger and Grün, 2009, and references therein). These forms reach from interstellar dust to planetary dust, dust from asteroids and cometary dust being of variable sizes and masses.…”

Section: Referring To Dustmentioning

confidence: 99%

Magnetopause displacements: the possible role of dust

Treumann

Baumjohann

2011

Ann. Geophys.

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Abstract. Large compressions of the magnetopause are proposed to occasionally result from temporary encounters of the magnetosphere with dust streams in interplanetary space. Such streams may have their origin in cometary dust tails or asteroids which cross the inner heliosphere or in meteoroids in Earth's vicinity. Dust ejected from such objects when embedding the magnetosphere for their limited transition time should cause substantial global deformations of the magnetopause/magnetosphere due to the very large dust grain mass and momentum which compensates for the low dust density when contributing to the upstream pressure variation.

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Dust Near The Sun

Cited by 146 publications

References 76 publications

Formation and Acceleration of Nano Dust in the Inner Heliosphere

Formation and Acceleration of Nano Dust in the Inner Heliosphere

Statistical analysis of the flux of micrometeoroids at Mercury from both cometary and asteroidal components

Magnetopause displacements: the possible role of dust

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