A5013993297- Astro and Planetary Science
- Planetary Science and Exploration
- Gamma-ray bursts and supernovae
- Ionosphere and magnetosphere dynamics
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Pulsars and Gravitational Waves Research
- Isotope Analysis in Ecology
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- Atmospheric Ozone and Climate
- Geology and Paleoclimatology Research
- Space Satellite Systems and Control
- Astrophysics and Star Formation Studies
- Inertial Sensor and Navigation
- Astrophysical Phenomena and Observations
- Geological and Geochemical Analysis
- Spacecraft Design and Technology
- Scientific Research and Discoveries
- Astronomy and Astrophysical Research
- Methane Hydrates and Related Phenomena
- Distributed and Parallel Computing Systems
- Fire effects on ecosystems
Western University
2016-2025
Croatian Science Foundation
2014-2016
Direct links between carbonaceous chondrites and their parent bodies in the solar system are rare. The Winchcombe meteorite is most accurately recorded chondrite fall. Its pre-atmospheric orbit cosmic-ray exposure age confirm that it arrived on Earth shortly after ejection from a primitive asteroid. Recovered only hours falling, composition of largely unmodified by terrestrial environment. It contains abundant hydrated silicates formed during fluid-rock reactions, carbon- nitrogen-bearing...
The Global Meteor Network (GMN) utilizes highly sensitive low-cost CMOS video cameras which run open-source meteor detection software on Raspberry Pi computers. Currently, over 450 GMN in 30 countries are deployed. main goal of the network is to provide long-term characterization radiants, flux, and size distribution annual showers outbursts optical mass range. rapid 24-hour publication cycle orbital data will enhance public situational awareness near-Earth meteoroid environment. also aims...
Abstract. The Hunga Tonga–Hunga Ha′apai volcano erupted on 15 January 2022, launching Lamb waves and gravity into the atmosphere. In this study, we present results using 13 globally distributed meteor radars identify volcanogenic in mesospheric/lower thermospheric winds. Leveraging High-Altitude Mechanistic general Circulation Model (HIAMCM), compare global propagation of these waves. We observed an eastward-propagating wave packet with phase speed 240 ± 5.7 m s−1 a westward-propagating...
ABSTRACT It has recently been shown by Egal et al. that some types of existing meteor in-atmosphere trajectory estimation methods may be less accurate than others, particularly when applied to high-precision optical measurements. The comparative performance solution previously only examined for a small number cases. Besides the radiant, orbital accuracy depends on pre-atmosphere velocities, which have both random and systematic biases. Thus, it is critical understand uncertainty in velocity...
Abstract On February 28, 2021, a fireball dropped ∼0.6 kg of recovered CM2 carbonaceous chondrite meteorites in South‐West England near the town Winchcombe. We reconstruct fireball's atmospheric trajectory, light curve, fragmentation behavior, and pre‐atmospheric orbit from optical records contributed by five networks. The progenitor meteoroid was three orders magnitude less massive (∼13 kg) than any previously observed fall. Winchcombe meteorite survived entry because it exposed to very low...
Many existing optical meteor trajectory estimation methods use the approximation that velocity of at beginning its luminous phase is equivalent to before atmospheric entry. Meteoroid kinetic energy loss prior cannot be measured, but for some masses and entry geometries neglecting this may lead non-negligible deceleration thermal ablation. Using a numerical meteoroid ablation model, we simulate kinematics meteoroids 180 km with initial velocities ranging from 11 s−1 71 s−1, compare model...
Abstract Ozone () is an important trace species in the mesopause region of Earth's atmosphere and difficult to directly probe. We found that percentage sporadic meteors produced persistent trains (PTs) exhibit semiannual variations which are strongly correlated with those average peak volume mixing ratio (vmr) secondary ozone maximum (near mesopause, 90–95 km). PTs long‐lasting, self‐emitting phenomena occasionally form after a meteor, thought arise from exothermic reactions between meteoric...
Abstract The Taurid Complex is a large interplanetary system that contains comet 2P/Encke, several meteoroid streams, and possibly number of near-Earth asteroids. size nature the have led to speculation it was formed through large-scale cometary breakup. Numerical investigations suggested planetary dynamics can create resonant region with objects concentrated in small segment orbit, known as swarm, which approaches Earth certain years provides favorable conditions for studying Complex....
Abstract The Križevci H6 meteorite was recovered on the basis of fireball data obtained by cameras Croatian Meteor Network. fireball, which occurred February 4, 2011, 23:20:40 UT , also observed meteor in Slovenia and Autonomous Fireball Observatory Martinsberg, Austria, belongs to European Here, we present detailed trajectory, velocity, deceleration, light curve, orbit. We modeled atmospheric fragmentation meteoroid curve deceleration. initial mass between 25–100 kg, most probably about 50...
Abstract The Hamburg (H4) meteorite fell on 17 January 2018 at 01:08 UT approximately 10 km north of Ann Arbor, Michigan. More than two dozen fragments totaling under 1 kg were recovered, primarily from frozen lake surfaces. fireball initial velocity was 15.83 ± 0.05 s −1 , based four independent records showing the above 50 altitude. radiant had a zenith angle 66.14 0.29° and an azimuth 121.56 1.2°. resulting low inclination (<1°) Apollo‐type orbit has large aphelion distance Tisserand...
Meteor showers and their outbursts are the dominant source of meteoroid impact risk to spacecraft on short time scales. shower prediction models depend historical observations produce accurate forecasts. However, current lack quality persistent world-wide monitoring at optical sizes has left some recent major poorly observed. A novel method computing meteor flux is developed applied Global Network data. The verified against previously published Perseids Geminids. complete mathematical...
Abstract The τ -Herculids (IAU shower number 61 TAH) is a minor meteor associated with comet 73P/Schwassmann–Wachmann 3, Jupiter-family that disintegrated into several fragments in 1995. As consequence of the nucleus breakup, possible increased rates were predicted for 2022. On May 30–31, observation networks around world reported two distinct peaks TAH activity, solar longitudes 69.°02 and 69.°42. This work examines encounter conditions Earth meteoroids ejected from 73P during splitting...
We present a new numerical model of the eta-Aquariid and Orionid meteor showers. The investigates origin, variability age apparitions from 1985 to day, in order forecast their activity over next several decades. Through integration millions simulated meteoroids custom-made particle weighting scheme, we characteristics every apparition between 2050. modeled showers are calibrated using 35 years observations including profiles interannual variability. Our reproduces general present-day...
Context. Several authors predicted an outburst of the Draconid meteor shower in 2018, but with uncertain level activity. Aims. Optical observations were used to derive population and mass indices, flux, radiant positions meteors. Methods. We performed 90 min multi-station after peak activity using highly sensitive Electron Multiplying Charge Coupled Device cameras. The data calibration is discussed detail. A novel maximum likelihood estimation method was developed compute index robust error...
Abstract The Golden (British Columbia, Canada) meteorite fall occurred on October 4, 2021 at 0534 UT with the first recovered fragment (1.3 kg) landing an occupied bed. associated fireball was recorded by numerous cameras permitting reconstruction of its trajectory and orbit. entered atmosphere a 54° angle from horizontal speed 18 km s −1 . reached peak brightness −14, having become luminous height >84 ending altitude. Analysis infrasonic record bolide produced estimated mass kg while...
Context: Results from previous searches for new meteor showers in the combined Croatian Meteor Network and SonotaCo databases suggested possible parent bodies several newly identified showers. Aims: We aim to perform an analysis validate connection between candidate bodies. Methods: Simulated particles were ejected bodies, a dynamical modeling was performed results compared real shower observations. Results: From 13 analysed cases, three found be connected with comets, four asteroids which...
We describe an improved technique for using the backscattered phase from meteor radar echo measurements just prior to specular point ($t_{0}$) calculate speeds and their uncertainty. Our method, which builds on earlier work of Cervera et al (1997), scans possible in Fresnel distance - time domain with a dynamic, sliding window derives best-speed estimate resultant speed distribution. test performance our called pre-$t_{0}$ by sliding-slopes (PSSST), transverse scattered echoes observed...
In the first paper of this series we examined existing methods optical meteor trajectory estimation and developed a novel method which simultaneously uses both geometry dynamics meteors to constrain their trajectories. We also simulator an ablation model generate realistic synthetic trajectories use test solvers. second paper, perform simulation validation estimate radiant velocity accuracy may be achieved by various observation systems as applied several showers. For low-resolution all-sky...
Context. A new meteor shower λ -Sculptorids produced by the comet 46P/Wirtanen was forecast for December 12, 2023. The predicted activity highly uncertain, but generally considered to be low. Observations in Australia, New Zealand, and Oceania were solicited help constrain size distribution of meteoroids shower. Aims. This work aims characterize shower, comparing observed radiants orbits, provide a calibration future predictions. Methods. Global Meteor Network video cameras used observe...