An orbital meteoroid stream survey using the Southern Argentina Agile MEteor Radar (SAAMER) based on a wavelet approach

Pokorný, Petr; Janches, Diego; Brown, Peter; Hormaechea, José Luis

doi:10.1016/j.icarus.2017.02.025

Cited by 28 publications

(25 citation statements)

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“…With the advent of new ground‐based and space‐borne observations of the Moon there exists new interest in understanding the differences between the lunar and terrestrial meteoroid environments. Like for the case of Mercury (Pokorný et al, , ), modeling the meteoroid flux on the Moon is critical for understanding the importance of impact vaporization as a source for the lunar exosphere (Bruno et al, ; Cremonese et al, ; Morgan et al, ; Morgan & Killen, ; Sarantos et al, ), as meteoroids in the size range of 5–200 μm are considered relevant to the daily resupply of the lunar atmosphere. The importance of impacts for the exosphere was demonstrated by the brightening of its sodium and potassium component during meteor showers (Barbieri et al, ; Colaprete et al, ; Smith et al, ; Szalay et al, ).…”

Section: Introductionmentioning

confidence: 99%

Meteoroids at the Moon: Orbital Properties, Surface Vaporization, and Impact Ejecta Production

et al. 2019

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We use a dynamical model to characterize the monthly and yearly variations of the lunar meteoroid environment for meteoroids originating from short and long‐period comets and the main‐belt asteroids. Our results show that if we assume the meteoroid mass flux of 43.3 tons per day at Earth, inferred from previous works, the mass flux of meteoroids impacting the Moon is 30 times smaller, approximately 1.4 tons per day, and shows variations of the order of 10% over a year. The mass flux difference is due to the combined effect of the smaller cross‐section of the Moon (factor of 13.46) and Earth's larger gravitational focusing (factor of 2–2.5). The lunar surface is vaporized by these impactors at an average impact vaporization flux of 11.6 × 10−16 g·cm−2·s−1, providing a significant source for the rarefied lunar exosphere. Our model predicts acceptable vaporization rates and reproduces the local time dependence of observations of the dust ejecta cloud, measured by the Lunar Dust Experiment on board NASA's Lunar Atmosphere and Dust Environment (LADEE) satellite. However, the predicted density of the lunar ejecta cloud is four orders of magnitude larger than reported values by LADEE. This discrepancy might be attributed to a much lower yield from meteoroid impacts on fluffy lunar regolith and/or a lower detection efficiency of the LADEE dust detector. We suggest an upper limit of 30 cm per million years for the soil gardening rate from small meteoroids.

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Section: Introductionmentioning

confidence: 99%

Meteoroids at the Moon: Orbital Properties, Surface Vaporization, and Impact Ejecta Production

et al. 2019

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“…More observations , including multiyears, seasons, and sky coverage, enable the identification of expected and/or unexpected outbursts. For example, Jenniskens et al (2016a) reported a Volantid shower outburst, a high southern ecliptic latitude shower that showed unexpected high activity only during 2015 New Year's Eve according to both optical and radar measurements (Younger et al 2016;Pokorný et al 2017). More recently, comparisons between radar and optical observations have shown specific showers to have differences in the evolutionary stages of their different mass ranges (Jeniskens et al 2018;Bruzzone et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Observations of an Unexpected Meteor Shower Outburst at High Ecliptic Southern Latitude and Its Potential Origin

Janches

Bruzzone

Weryk

et al. 2020

ApJL

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A strong and unexpected meteor shower outburst was observed by the Southern Argentina Agile MEteor Radar Orbital System (SAAMER-OS) at high southern ecliptic latitude within the South Toroidal region. The outburst, which was active throughout solar longitudes 351°and 352°, peaked at 09:30 UT on 2020 March 12, has a mean Sun-centered ecliptic radiant of λ−λ 0 ∼307°.5 and β∼−77°.2 and a geocentric velocity of 30.7 km s −1 . Using the ¢ D parameter criterion, we find the corresponding orbital elements of the outburst to match well with both the β Tucanid and δ Mensid meteor showers, suggesting these are in fact the same shower. We also find a promising parent candidate in asteroid (248590) 2006 CS, a large (D∼2 km) highly inclined 52°near-Earth object.

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“…Unlike sporadics, meteoroids within streams move in approximately parallel paths and at nearly the same speed. The Earth intersects numerous streams in its annual trek around the sun, resulting in periods of increased flux, or showers, of meteoroids at the top of the atmosphere (Brown et al 2010;Pokorný et al 2017a;. Although the SMC is responsible for providing a constant source of impactors to create and maintain exospheres on airless bodies, events produced by meteoroid streams offer a unique opportunity to study the physical processes involved in this phenomena with a much more constrained input (e.g., velocity distribution, directionality, temporal variability, etc).…”

Section: Effects Due To Meteor Showersmentioning

confidence: 99%

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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An orbital meteoroid stream survey using the Southern Argentina Agile MEteor Radar (SAAMER) based on a wavelet approach

Cited by 28 publications

References 50 publications

Meteoroids at the Moon: Orbital Properties, Surface Vaporization, and Impact Ejecta Production

Meteoroids at the Moon: Orbital Properties, Surface Vaporization, and Impact Ejecta Production

Observations of an Unexpected Meteor Shower Outburst at High Ecliptic Southern Latitude and Its Potential Origin

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

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