Esther Drolshagen
A5021854605- Astro and Planetary Science
- Planetary Science and Exploration
- Earthquake Detection and Analysis
- Stellar, planetary, and galactic studies
- Seismology and Earthquake Studies
- Seismic Waves and Analysis
- Ionosphere and magnetosphere dynamics
- Geology and Paleoclimatology Research
- Astrophysics and Star Formation Studies
- IoT-based Smart Home Systems
- Aeolian processes and effects
- Isotope Analysis in Ecology
- Gamma-ray bursts and supernovae
- earthquake and tectonic studies
- Big Data Technologies and Applications
- Radiation Therapy and Dosimetry
- Radioactivity and Radon Measurements
- Ocular and Laser Science Research
- Network Security and Intrusion Detection
- Radioactive Decay and Measurement Techniques
- Nuclear Physics and Applications
- Infrared Target Detection Methodologies
- Fire effects on ecosystems
- Advanced Measurement and Detection Methods
- Fire Detection and Safety Systems
Carl von Ossietzky Universität Oldenburg
2016-2021
The study of dust, the most abundant material in cometary nuclei, is pivotal understanding original materials forming Solar system. Measuring coma phase function provides a tool to investigate nature dust. Rosetta/OSIRIS sampled comet 67P/Churyumov–Gerasimenko, covering large angle range small amount time. Twelve series were acquired period from 2015 March 2016 February for this scientific purpose. These data allowed, after stray light removal, measuring shape, its reddening, and reddening...
The OSIRIS (optical, spectroscopic and infrared remote imaging system) instrument on board the ESA Rosetta spacecraft collected data of 67P/Churyumov–Gerasimenko for over 2 yr. consists two cameras, a Narrow Angle Camera Wide Camera. For specific sequences related to observation dust aggregates in 67P's coma, cameras were operating simultaneously. are mounted 0.7 m apart from each other, as result this baseline yields parallax shift apparent particle trails analysed images directly...
Large meteoroids can be registered in infrasound recordings during their entry into the Earth’s atmosphere. A comprehensive study of 10 large fireball events years 2018 and 2019 highlights detection characterization using global arrays International Monitoring System (IMS) Comprehensive Nuclear-Test-Ban Treaty (CTBT). The focuses on observation event analysis fireballs to estimate respective location, yield, trajectory, behavior. Signal characteristics are derived by applying Progressive...
Cometary outbursts on several comets have been observed both by ground-based telescopes and in situ instruments spacecraft. However, the mechanism behind these phenomena their physical properties are still unclear. The optical, spectrocopic infrared remote imaging system (OSIRIS) onboard Rosetta spacecraft provided first-hand information from comet 67P/Churyumov–Gerasimenko during its perihelion passage 2015. of can be investigated examining time series high-resolution images. An analysis is...
In meteor physics the luminous efficiency ${\tau}$ is used to convert meteor's magnitude corresponding meteoroid's mass. However, lack of sufficiently accurate verification methods or adequate laboratory tests leave this parameter be controversially discussed. work meteor/fireball data obtained by Fireball Recovery and InterPlanetary Observation Network (FRIPON) was calculate masses pre-atmospheric meteoroids which could in turn compared brightnesses assess their efficiencies. For that,...
Context: Until recently, camera networks designed for monitoring fireballs worldwide were not fully automated, implying that in case of a meteorite fall, the recovery campaign was rarely immediate. This an important limiting factor as most fragile - hence precious meteorites must be recovered rapidly to avoid their alteration. Aims: The Fireball Recovery and InterPlanetary Observation Network (FRIPON) scientific project overcome this limitation. network comprises automated radio deployed...
We present a photometric analysis of individual dust grains in the coma comet 67P/Churyumov–Gerasimenko using OSIRIS images taken from 2015 July to 2016 January. analysed sample 555 during 18 d at heliocentric distances ranging between 1.25 and 2.04 au nucleocentric 80 437 km. An automated method detect tracks was specifically developed. The were by NAC four different filters: Near-IR (882 nm), Orange (649 FarOrange nm) Blue (480 nm). It not always possible recognize all filters, hence we...
In a Rosetta/OSIRIS imaging activity in 2015 June, we have observed the dynamic motion of particles close to spacecraft. Due focal setting OSIRIS wide angle camera, these were blurred, which can be used measure their distances We detected 109 dust aggregates over 130 min long sequence, and find that sizes are around millimetre cluster between 2 40 m from Their number densities about factor 10 higher than expected for overall coma highly fluctuating. velocities small compared spacecraft...
Context. Fireballs are particularly bright meteors produced by large meteoroids or small asteroids that enter the Earth’s atmosphere. These objects, of sizes from some tens centimetres to a few metres, difficult record with typical meteor detection methods. Therefore, their characteristics and fluxes still not well known. Infrasound signals can travel through atmosphere over distances. Impacting produce those signals, as space-detectable optical signatures. Aims. This paper aims study...
Context. The luminous efficiency, τ , can be used to compute the pre-atmospheric masses of meteoroids from corresponding recorded meteor brightnesses. derivation efficiency is non-trivial and subject biases model assumptions. This has led greatly varying results in last decades studies. Aims. present paper aims investigate how a reduction various observational achieved derive (more) reliable values for efficiency. Methods. A total 281 meteors observed by Fireball Recovery InterPlanetary...
<p>Large meteoroids can be registered in infrasound recordings during their entry into the Earth’s atmosphere. A comprehensive study of 10 large fireball events years 2018 and 2019 highlights detection characterization using global arrays International Monitoring System (IMS) Comprehensive Nuclear-Test-Ban Treaty (CTBT). The focuses on observation event analysis fireballs to estimate respective location, yield, trajectory, behavior. Signal characteristics are...
ABSTRACT The increase in detector sensitivity and availability the past three decades has allowed us to derive knowledge of meteoroid flux impact energy into Earth’s atmosphere. We present multi-instrument detected 2018 December 22 fireball over Western Pyrenees, compare several techniques aiming obtain a reliable method be used when measuring impacts similar scale. From trajectory data alone, we found bulk density 3.5 g cm−3 most likely value for Pyrenean meteoroid. This further constrain...