Implications of the atmospheric density profile in the processing of fireball observations

Lyytinen, E.; Gritsevich, Maria

doi:10.1016/j.pss.2015.10.012

Cited by 35 publications

(48 citation statements)

References 17 publications

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“…This is larger than the calculated pre‐entry mass of Annama based on the fireball data analysis (Trigo‐Rodríguez et al. ; Lyytinen and Gritsevich ), suggesting that the meteorite had a complex exposure history, i.e., was exposed to cosmic radiation under more than one shielding condition. The 3 He/ 21 Ne ratio of Annama Ia + Ib is 3.65, which is a bit lower than expected for a meteorite with 22 Ne/ 21 Ne = 1.058 (based both on the Leya and Masarik model and the “Bern‐line”; Eberhardt et al.…”

Section: Discussionmentioning

confidence: 64%

“…Note that the measured 36 Cl concentration in Annama I is~30% higher than calculated 36 Cl production rates by spallation reactions alone, indicating a significant contribution of neutron-capture 36 Cl. than the calculated pre-entry mass of Annama based on the fireball data analysis Lyytinen and Gritsevich 2016), suggesting that the meteorite had a complex exposure history, i.e., was exposed to cosmic radiation under more than one shielding condition. The 3 He/ 21 Ne ratio of Annama Ia + Ib is 3.65, which is a bit lower than expected for a meteorite with 22 Ne/ 21 Ne = 1.058 (based both on the Leya and Masarik [2009] model and the "Bern-line"; Eberhardt et al 1966), suggesting He loss on the order of~15%.…”

Section: Cosmogenic Noble Gasesmentioning

confidence: 90%

“…The pre‐entry mass of the Annama meteoroid was estimated based on the deceleration analysis as described by Gritsevich (, ) to be in the range of 400–500 kg (Trigo‐Rodríguez et al. ; Lyytinen and Gritsevich ), with corresponding radius around 30–35 cm.…”

Section: Introductionmentioning

confidence: 99%

“…The fireball observations and heliocentric orbit reconstruction are detailed in Dmitriev et al (2015) and Trigo-Rodr ıguez et al (2015). The fireball data interpretation was done using the fb_entry program (Lyytinen and Gritsevich 2013) taking into account the atmospheric conditions present during the meteorite fall (Lyytinen and Gritsevich 2016). The derived characteristic parameters as well as the terminal height of the fireball indicated the possibility of surviving meteorite fragments reaching the ground Moreno-Ib añez et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Annama H chondrite—Mineralogy, physical properties, cosmic ray exposure, and parent body history

Kohout

Haloda

Halodová

et al. 2017

Meteorit & Planetary Scien

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The fall of the Annama meteorite occurred early morning (local time) on April 19, 2014 on the Kola Peninsula (Russia). Based on mineralogy and physical properties, Annama is a typical H chondri te. It has a high Ar-Ar age of 4.4 Ga. Its cosmic ray exposure history is atypical as it is not part of the large group of H chondrites with a prominent 7 -8 Ma peak in the exposure age histograms. Instead, its exposure age is within uncertainty of a smal ler peak at 30 ±4 Ma. The results from short-lived radionuclides are compatible with an atmosperic pre-entry radius of 30 -40 cm. However, based on noble gas and cosmogenic radionuclide data, Annama must have been part of a larger body (radius >65 cm) for a large part of its cosmic ray exposure history. The 10 Be concentration indicates a recent (3 -5 Ma) breakup which may be responsible for the Annama parent body size reduction to 30 -35 cm pre-entry radius.

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Section: Discussionmentioning

confidence: 64%

Section: Cosmogenic Noble Gasesmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Annama H chondrite—Mineralogy, physical properties, cosmic ray exposure, and parent body history

Kohout

Haloda

Halodová

et al. 2017

Meteorit & Planetary Scien

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“…). The ballistic coefficient α characterizes the drag intensity and according to the most advanced algorithm can be found as described in Lyytinen and Gritsevich ().…”

Section: Methodsmentioning

confidence: 99%

Park Forest (L5) and the asteroidal source of shocked L chondrites

Meier

Welten

Riebe

et al. 2017

Meteorit & Planetary Scien

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The Park Forest (L5) meteorite fell in a suburb of Chicago, Illinois (USA) on March 26, 2003. It is one of the currently 25 meteorites for which photographic documentation of the fireball enabled the reconstruction of the meteoroid orbit. The combination of orbits with pre‐atmospheric sizes, cosmic‐ray exposure (CRE), and radiogenic gas retention ages (“cosmic histories”) is significant because they can be used to constrain the meteoroid's “birth region,” and test models of meteoroid delivery. Using He, Ne, Ar, 10Be, and 26Al, as well as a dynamical model, we show that the Park Forest meteoroid had a pre‐atmospheric size close to 180 g cm−2, 0–40% porosity, and a pre‐atmospheric mass range of ~2–6 tons. It has a CRE age of 14 ± 2 Ma, and (U, Th)‐He and K‐Ar ages of 430 ± 90 and 490 ± 70 Ma, respectively. Of the meteorites with photographic orbits, Park Forest is the second (after Novato) that was shocked during the L chondrite parent body (LCPB) break‐up event approximately 470 Ma ago. The suggested association of this event with the formation of the Gefion family of asteroids has recently been challenged and we suggest the Ino family as a potential alternative source for the shocked L chondrites. The location of the LCPB break‐up event close to the 5:2 resonance also allows us to put some constraints on the possible orbital migration paths of the Park Forest meteoroid.

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Neutral density estimation derived from meteoroid measurements using high‐power, large‐aperture radar

2016

JGR Atmospheres

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We present a new method to estimate the neutral density of the lower thermosphere/upper mesosphere given deceleration measurements from meteoroids as they enter Earth's atmosphere. By tracking the plasma (referred to as head echoes) surrounding the ablating meteoroid, we are able to measure the range and velocity of the meteoroid in 3‐D. This is accomplished at Advanced Research Projects Agency Long‐Range Tracking and Instrumentation Radar (ALTAIR) with the use of four additional receiving horns. Combined with the momentum and ablation equations, we can feed large quantities of data into a minimization function which estimates the associated constants related to the ablation process and, more importantly, the density ratios between successive layers of the atmosphere. Furthermore, if we take statistics of the masses and bulk densities of the meteoroids, we can calculate the neutral densities and its associated error by the ratio distribution on the minimum error statistic. A standard deviation of approximately 10% can be achieved, neglecting measurement error from the radar. Errors in velocity and deceleration compound this uncertainty, which in the best case amounts to an additional 4% error. The accuracy can be further improved if we take increasing amounts of measurements, limited only by the quality of the ranging measurements and the probability of knowing the median of the distribution. Data analyzed consist mainly of approximately 500 meteoroids over a span of 20 min on two separate days. The results are compared to the existing atmospheric model NRLMSISE‐00, which predicts lower density ratios and static neutral densities at these altitudes.

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Implications of the atmospheric density profile in the processing of fireball observations

Cited by 35 publications

References 17 publications

Annama H chondrite—Mineralogy, physical properties, cosmic ray exposure, and parent body history

Annama H chondrite—Mineralogy, physical properties, cosmic ray exposure, and parent body history

Park Forest (L5) and the asteroidal source of shocked L chondrites

Neutral density estimation derived from meteoroid measurements using high‐power, large‐aperture radar

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