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  Collisional Evolution of the Inner Zodiacal Cloud

Szalay, J. R., Pokorný, P., Malaspina, D. M., Pusack, A., Bale, S. D., Battams, K., et al. (2021). Collisional Evolution of the Inner Zodiacal Cloud. The Planetary Science Journal, 2(5): 185. doi:10.3847/PSJ/abf928.

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 Creators:
Szalay, J. R., Author
Pokorný, P., Author
Malaspina, D. M., Author
Pusack, A., Author
Bale, S. D., Author
Battams, K., Author
Gasque, L. C., Author
Goetz, K., Author
Krüger, Harald1, Author              
McComas, D. J., Author
Schwadron, N. A., Author
Strub, Peter1, Author              
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: Circumstellar dust; Interplanetary dust; Debris disks; Meteoroids; Meteor streams
 Abstract: The zodiacal cloud is one of the largest structures in the solar system and strongly governed by meteoroid collisions near the Sun. Collisional erosion occurs throughout the zodiacal cloud, yet it is historically difficult to directly measure and has never been observed for discrete meteoroid streams. After six orbits with Parker Solar Probe (PSP), its dust impact rates are consistent with at least three distinct populations: bound zodiacal dust grains on elliptic orbits (α-meteoroids), unbound β-meteoroids on hyperbolic orbits, and a third population of impactors that may be either direct observations of discrete meteoroid streams or their collisional by-products ("β-streams"). The β-stream from the Geminids meteoroid stream is a favorable candidate for the third impactor population. β-streams of varying intensities are expected to be produced by all meteoroid streams, particularly in the inner solar system, and are a universal phenomenon in all exozodiacal disks. We find the majority of collisional erosion of the zodiacal cloud occurs in the range of 10–20 solar radii and expect this region to also produce the majority of pickup ions due to dust in the inner solar system. A zodiacal erosion rate of at least ∼100 kg s−1 and flux of β-meteoroids at 1 au of (0.4–0.8) × 10−4 m−2 s−1 are found to be consistent with the observed impact rates. The β-meteoroids investigated here are not found to be primarily responsible for the inner source of pickup ions, suggesting nanograins susceptible to electromagnetic forces with radii below ∼50 nm are the inner source of pickup ions. We expect the peak deposited energy flux to PSP due to dust to increase in subsequent orbits, up to 7 times that experienced during its sixth orbit.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/PSJ/abf928
 Degree: -

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Title: The Planetary Science Journal
  Other : Planet. Sci. J.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: IOP Publishing
Pages: - Volume / Issue: 2 (5) Sequence Number: 185 Start / End Page: - Identifier: ISSN: 2632-3338
CoNE: https://pure.mpg.de/cone/journals/resource/2632-3338