Simulating the Benešov bolide flowfield and spectrum at altitudes of 47 and 57 km

Johnston, Christopher O.; Stern, Eric C.; Borovička, J.

doi:10.1016/j.icarus.2020.114037

Cited by 7 publications

(3 citation statements)

References 53 publications

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“…According to this assumption, the pressure at 39-45 km is found to be equal to 0.7-1.7 MPa for other events (Brown et al 2011;Popova et al 2011Popova et al , 2013Borovička et al 2013). Simulations show that the pressure decreases rapidly with increasing distance from the front, but significant overpressure still remains at a distance of a few meters behind the body of the Benešov bolide (Johnston et al 2021;Borovička et al 1998). Thus, we can assume that a significant fraction of wake luminosity originated from the overpressurized zone.…”

Section: Comparison Of Bolide Spectra and Spectra Of Lip At Low Pressurementioning

confidence: 94%

Laboratory modeling in laser-induced plasma to estimate the pressure in bolide wake

Zakuskin

Beglaryan

Лабутин

2023

A&A

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Aims. We study Fe and FeO emission in laser-induced plasma under reduced pressure to develop an approach for finding the conditions under which the laboratory plasma state matches the state of bolide wake plasma. Methods. To acquire spectra of laser-induced plasma, we ablated a target of Fe 3 O 4 in a vacuum chamber using a Q-switched laser. The Boltzmann plot method and Stark broadening of the emission lines were used to estimate the plasma temperature and electron number density. The intensity ratios of two Fe I lines (544.61 nm and 558.69 nm) to the intensity of FeO orange band at 587.1 nm were calculated to compare the conditions in laser-induced plasma and bolide wake plasma. Results. Several combinations of pressure (75-150 Torr) and delay (12 -15 µs) lead to the highest degree of similarity between laser-induced plasma and the Benešov bolide spectra at an altitude of 39 km. Importantly, the plasma parameters and pressure are consistent at these points. A detailed comparison of the spectra shows that the best-match conditions are 100 Torr and 15 µs. This pressure is ≈25 times higher than the ambient pressure at this altitude. Conclusions. We assume that the pressure in the bolide wake is higher than the ambient pressure by a factor of 20-30. This can be considered to be the upper bound estimate of the pressure in the bolide wake, and the developed approach would be beneficial to support the modeling of a meteoroid entry.

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Section: Comparison Of Bolide Spectra and Spectra Of Lip At Low Pressurementioning

confidence: 94%

Laboratory modeling in laser-induced plasma to estimate the pressure in bolide wake

Zakuskin

Beglaryan

Лабутин

2023

A&A

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“…We remark that the initial dynamic mass estimate or the preatmospheric size can be derived using the methods described in other works [43][44][45][46][47][48]; hence, we leave it out of the scope of the present model. We also note that alternative models accounting for ablation have been recently developed; however, further discussion on that topic is beyond the scope of this study, and the reader is referred to the following literature [46,47,[49][50][51][52]. As noted in the introduction, highstrength meteoroids from asteroids or planetary bodies exhibit a very different behavior than fragile dust aggregates originating from comets [53][54][55][56][57].…”

Section: Single Body Eorymentioning

confidence: 99%

A Numerical Approach to Study Ablation of Large Bolides: Application to Chelyabinsk

Trigo-Rodríguez

Dergham

Gritsevich

et al. 2021

Advances in Astronomy

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In this study, we investigate the ablation properties of bolides capable of producing meteorites. The casual dashcam recordings from many locations of the Chelyabinsk superbolide associated with the atmospheric entry of an 18 m in diameter near-Earth object (NEO) have provided an excellent opportunity to reconstruct its atmospheric trajectory, deceleration, and heliocentric orbit. In this study, we focus on the study of the ablation properties of the Chelyabinsk bolide on the basis of its deceleration and fragmentation. We explore whether meteoroids exhibiting abrupt fragmentation can be studied by analyzing segments of the trajectory that do not include a disruption episode. We apply that approach to the lower part of the trajectory of the Chelyabinsk bolide to demonstrate that the obtained parameters are consistent. To do that, we implemented a numerical (Runge–Kutta) method appropriate for deriving the ablation properties of bolides based on observations. The method was successfully tested with the cases previously published in the literature. Our model yields fits that agree with observations reasonably well. It also produces a good fit to the main observed characteristics of Chelyabinsk superbolide and provides its averaged ablation coefficient σ = 0.034 s2 km−2. Our study also explores the main implications for impact hazard, concluding that tens of meters in diameter NEOs encountering the Earth in grazing trajectories and exhibiting low geocentric velocities are penetrating deeper into the atmosphere than previously thought and, as such, are capable of producing meteorites and even damage on the ground.

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“…The relative weights of these two first-order components (continuum and oxygen triplet) are determined primarily by object diameter, altitude, velocity, and view angle. Second order effects include the treatment of ablation physics and requires detailed knowledge of the asteroid composition [28]. We suffice it to say, exact bolide emission within the GLM bandpass is an area of active research.…”

Section: Goes Glm Datamentioning

confidence: 99%

An Automated Bolide Detection Pipeline for GOES GLM

Smith,

Morris,

Rumpf

et al. 2021

Preprint

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Simulating the Benešov bolide flowfield and spectrum at altitudes of 47 and 57 km

Cited by 7 publications

References 53 publications

Laboratory modeling in laser-induced plasma to estimate the pressure in bolide wake

Laboratory modeling in laser-induced plasma to estimate the pressure in bolide wake

A Numerical Approach to Study Ablation of Large Bolides: Application to Chelyabinsk

An Automated Bolide Detection Pipeline for GOES GLM

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