J. K. Appel

ORCID: 0000-0002-4284-002X
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About
Contact & Profiles
Research Areas
  • Planetary Science and Exploration
  • Radiation Therapy and Dosimetry
  • Astro and Planetary Science
  • Solar and Space Plasma Dynamics
  • Radiation Detection and Scintillator Technologies
  • Space Science and Extraterrestrial Life
  • Nuclear Physics and Applications
  • Laser-induced spectroscopy and plasma
  • Radioactivity and Radon Measurements
  • Particle Detector Development and Performance
  • Graphite, nuclear technology, radiation studies
  • Spacecraft Design and Technology
  • Spaceflight effects on biology
  • Advanced Radiotherapy Techniques
  • Space Exploration and Technology
  • Ionosphere and magnetosphere dynamics
  • Radiation Effects and Dosimetry
  • Radiation Dose and Imaging
  • Solar Radiation and Photovoltaics
  • Astronomical Observations and Instrumentation
  • Satellite Communication Systems
  • Particle Dynamics in Fluid Flows
  • Spacecraft and Cryogenic Technologies
  • Ion-surface interactions and analysis
  • Space exploration and regulation

Fachhochschule Kiel
2017-2018

Charles River Laboratories (Netherlands)
2018

Kiel University
2014-2017

Context: The Radiation Assessment Detector (RAD) on the Mars Science Laboratory (MSL) has been measuring radiation environment surface of since August 6th 2012. MSL-RAD is first instrument to provide detailed information about charged and neutral particle spectra dose rates Martian surface, one primary objectives RAD investigation help improve validate current transport models.

10.1051/swsc/2016008 article EN cc-by Journal of Space Weather and Space Climate 2016-01-01

The Radiation Assessment Detector (RAD), onboard the Mars Science Laboratory (MSL) rover Curiosity, measures energetic charged and neutral particles radiation dose rate on surface of Mars. An important factor for determining biological impact Martian is specific contribution neutrons, with their deeper penetration depth ensuing high effectiveness. This very difficult to measure quantitatively, resulting in considerable uncertainties total dose. In contrast particles, (neutrons gamma rays)...

10.1002/2013je004539 article EN Journal of Geophysical Research Planets 2014-02-25

The Radiation Assessment Detector (RAD), on board Mars Science Laboratory's (MSL) rover Curiosity, measures the energy spectra of both energetic charged and neutral particles along with radiation dose rate at surface Mars. With these first-ever measurements Martian surface, RAD observed several effects influencing galactic cosmic-ray (GCR) induced concurrently: (a) short-term diurnal variations atmospheric pressure caused by daily thermal tides, (b) long-term seasonal changes in atmosphere,...

10.1088/0004-637x/810/1/24 article EN The Astrophysical Journal 2015-08-27

Aims: To predict the cruise radiation environment related to future human missions Mars, correlation between solar modulation potential and dose rate measured by Radiation Assessment Detector (RAD) has been analyzed empirical models have employed quantify this correlation. Methods: The instrument RAD, onboard Mars Science Laboratory's (MSL) rover Curiosity, measures a broad spectrum of energetic particles along with during 253-day phase as well on surface Mars. With these first ever...

10.1051/0004-6361/201525680 article EN Astronomy and Astrophysics 2015-03-24

The propagation of 15 interplanetary coronal mass ejections (ICMEs) from Earth's orbit (1 AU) to Mars (~ 1.5 has been studied with their speed estimated both measurements and simulations. enhancement magnetic fields related ICMEs shock fronts cause the so-called Forbush decrease, which can be de- tected as a reduction galactic cosmic rays measured on-ground. We have used ray (GCR) data in-situ at Earth, STEREO A B well GCR by Radiation Assessment Detector (RAD) instrument onboard Science...

10.1002/2017ja024700 article EN publisher-specific-oa Journal of Geophysical Research Space Physics 2018-01-01

The Mars Science Laboratory rover Curiosity, operating on the surface of Mars, is exposed to radiation fluxes from above and below. Galactic Cosmic Rays travel through Martian atmosphere, producing a modified spectrum consisting both primary secondary particles at ground level. These produce an upward directed particle as they interact with soil. Here we develop method distinguish downward in Radiation Assessment Detector (RAD) instrument, verify it using data taken during cruise apply...

10.1002/2016ea000240 article EN cc-by-nc-nd Earth and Space Science 2017-11-15

Abstract. The Radiation Assessment Detector (RAD), on board the Mars Science Laboratory (MSL) rover Curiosity, measures energetic charged and neutral particles radiation dose rate surface of Mars. Although particle spectra have been investigated in detail, electron positron not yet. reason for that is they are difficult to separate from each other because technical challenges involved extracting energy raw data. We use GEANT4 model behavior RAD instrument electron/positron measurements....

10.5194/angeo-34-133-2016 article EN cc-by Annales Geophysicae 2016-01-27
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