The Morávka meteorite fall: 1. Description of the events and determination of the fireball trajectory and orbit from video records

Borovička, J.; Spurný, Pavel; Kalenda, Pavel; Tagliaferri, E.

doi:10.1111/j.1945-5100.2003.tb00293.x

Cited by 69 publications

(43 citation statements)

References 18 publications

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“…Recently, infrasound records have been combined with satellite data to estimate bolide source energies, luminous efficiencies, and to calibrate influx rates observed by satellite systems (Brown et al 2002b), while multistation recordings have been employed for bolide geolocation (Brown et al 2002c). A recent analysis of the Morávka meteorite fall (BoroviËka et al 2003a;Brown et al 2003) has placed some limits on characteristics of the shock wave source at the fireball from both the ballistic wave and fragmentation events, suggesting that the deviation of the ray normals for the fragmentation events may be as much as 30° beyond that expected from a purely cylindrical line source blast.…”

Section: Infrasonic Recordingsmentioning

confidence: 99%

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Entry dynamics and acoustics/infrasonic/seismic analysis for the Neuschwanstein meteorite fall

Revelle

Brown

Spurný

2004

Meteorit & Planetary Scien

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Abstract-We have analyzed several types of data associated with the well-documented fall of the Neuschwanstein meteorites on April 6, 2002 (a total of three meteorites have been recovered). This includes ground-based photographic and radiometer data as well as infrasound and seismic data from this very significant bolide event (Spurn˝ et al. 2002(Spurn˝ et al. , 2003. We have also used these data to model the entry of Neuschwanstein, including the expected dynamics, energetics, panchromatic luminosity, and associated fragmentation effects. In addition, we have calculated the differential efficiency of acoustical waves for Neuschwanstein and used these values to compare against the efficiency calculated using available ground-based infrasound data. This new numerical technique has allowed the source height to be determined independent of ray tracing solutions. We have also carried out theoretical ray tracing for a moving point source (not strictly a cylindrical line emission) and for an infinite speed line source. In addition, we have determined the ray turning heights as a function of the source height for both initially upward and downward propagating rays, independent of the explicit ray tracing (detailed propagation path) programs. These results all agree on the origins of the acoustic emission and explicit source heights for Neuschwanstein for the strongest infrasonic signals. Calculated source energies using more than four different independent approaches agree that Neuschwanstein was certainly <500 kg in initial mass, given the initial velocity of 20.95 km/s, resulting in an initial source energy ≤0.0157-0.0276 kt TNT equivalent (4.185 × 10 12 J). Local source energies at the calculated infrasonic/seismic source altitudes are up to two orders of magnitude smaller than this initial source energy.

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Section: Infrasonic Recordingsmentioning

confidence: 99%

“…BoroviËka et al 2003a)-the orbit of the Neuschwanstein meteorite is exceptional in that it is identical to the Pribram meteorite fall of April 7, 1959(Spurn˝ et al 2002. This unusual situation is further complicated by the fact that the Neuschwanstein meteorite is an EL chondrite, unlike the Pribram meteorite, which was an H chondrite.…”

Section: Introductionmentioning

confidence: 99%

Entry dynamics and acoustics/infrasonic/seismic analysis for the Neuschwanstein meteorite fall

Revelle

Brown

Spurný

2004

Meteorit & Planetary Scien

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“…We based our deduction of the meteoric manifestation on the similar scenario reported in numerous past works, studied with distinct instrument-based approach: ground-based video cameras (Spurný 1994;Kinoshita et al 1999;Borovička et al 2003), seismic and infrasound records (Brown et al 2002(Brown et al , 2003Ishihara et al 2003Ishihara et al , 2004Pujol et al 2005Pujol et al , 2006Yamada and Mori 2012), and satellite-based optical instruments (Nemtchinov et al 1997;Brown et al 2002).…”

Section: Introductionmentioning

confidence: 99%

A meteor shockwave event recorded at seismic and infrasound stations in northern Taiwan

et al. 2017

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Three mysterious explosion sounds were heard in the coastal towns of Tamsui, west of Taipei in northern Taiwan, in the early evening of December 5, 2013. The event left clear signals that are identified in the recordings of 12 regional seismometers and 3 infrasound sensors and processed by means of travel time analysis. The apparent velocity of ~330 m/s of the signals confirms that the energy transmission was through the atmosphere, and the characteristics of the waveforms suggest the meteor-generated shockwaves. We use the graphical method as well as the Genetic Algorithm optimization approach to constrain the trajectory of the meteor and to locate its projected intercept with the ground-(25.33 N, 121.26 E), approximately 20 km off the coast of Tamsui. The trajectory has azimuth (measured from north in a map view in the clockwise direction) of 303° and (near-vertical) elevation angle of 70°. From the observed period of 1.3 s at the maximum amplitude of the infrasound signal, we estimate by conventional scaling law that the meteor in question had impact energy on the order of 5 × 10 10 J (equivalent to an earthquake of local magnitude 4) or roughly a size of ~0.5 m across.

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“…In order to understand bolide, and meteorite, falls, observations of such events from the ground are now routinely made in many regions on the Earth using various methods such as still-photographs (e.g., Halliday et al, 1981Halliday et al, , 1996, video recording (e.g., Borovickia et al, 2003), and spectroscopy measurements (e.g., Kasuga et al, 2005). The purpose of these observations are the optical detection and analysis of light emitted by bolides.…”

Section: Introductionmentioning

confidence: 99%

“…A meteoroid, or a bolide, with a supersonic velocity generates shockwaves in the atmosphere. Therefore, not only the optical observations mentioned above, but also the infrasound monitoring of shockwaves (e.g., McIntosh et al, 1976) and the seismic monitoring of shockwaves that convert to ground motions (e.g., Nagasawa, 1978;Cevolani, 1994;Brown et al, 2002;Ishihara et al, 2003Ishihara et al, , 2004Pujol et al, 2006) have also been carried out. From this point of view, we deployed speci c instruments such as infrasound sensors, seismic sensors, and an audio recorder as well as common optical instruments.…”

Section: Introductionmentioning

confidence: 99%

Infrasound/seismic observation of the Hayabusa reentry: Observations and preliminary results

et al. 2012

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The Hayabusa, the world's rst sample-return minor body explorer, returned to the Earth, and reentered the Earth's atmosphere on June 13, 2010. Multi-site ground observations of the Hayabusa reentry were carried out in the Woomera Prohibited Area (WPA), Australia. The ground observations were con gured with optical imaging with still and video recordings, spectroscopies, and shockwave detection with infrasound and seismic sensors. At three main stations, we installed small aperture infrasound/seismic arrays, as well as three single component seismic sub stations. The infrasound and seismic sensors clearly recorded sonic-boom-type shockwaves from the Hayabusa Sample Return Capsule (H-SRC) and the disrupted fragments of the Hayabusa Spacecraft (H-S/C) itself. Positive overpressure values of shockwaves (corresponding to the H-SRC) recorded at the three main stations were 1.3 Pa, 1.0 Pa, and 0.7 Pa with slant distances of 36.9 km, 54.9 km, and 67.8 km, respectively. Incident vectors of the shockwave from the H-SRC at all three arrays are estimated by an F-K spectrum and agree well with those predicted. Particle motions of ground motions excited by the shockwave show characteristics of a typical Rayleigh wave.

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The Morávka meteorite fall: 1. Description of the events and determination of the fireball trajectory and orbit from video records

Cited by 69 publications

References 18 publications

Entry dynamics and acoustics/infrasonic/seismic analysis for the Neuschwanstein meteorite fall

Entry dynamics and acoustics/infrasonic/seismic analysis for the Neuschwanstein meteorite fall

A meteor shockwave event recorded at seismic and infrasound stations in northern Taiwan

Infrasound/seismic observation of the Hayabusa reentry: Observations and preliminary results

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