Search results for "atmospheric modeling"

showing 2 items of 22 documents

Measurement of the average shape of longitudinal profiles of cosmic-ray air showers at the Pierre Auger Observatory

2019

The profile of the longitudinal development of showers produced by ultra-high energy cosmic rays carries information related to the interaction properties of the primary particles with atmospheric nuclei. In this work, we present the first measurement of the average shower profile in traversed atmospheric depth at the Pierre Auger Observatory. The shapes of profiles are well reproduced by the Gaisser-Hillas parametrization within the range studied, for E>10 17.8 eV .A detailed analysis of the systematic uncertainties is performed using ten years of data and a full detector simulation. The average shape is quantified using two variables related to the width and asymmetry of the profile, and …

p: showersphoton: Cherenkovinteraction: modelAstronomyHadronpiastro-ph.HE; astro-ph.HE01 natural sciencesnitrogenironParametrization (atmospheric modeling)Monte Carlomedia_commonPhysicsastro-ph.HEHigh Energy Astrophysical Phenomena (astro-ph.HE)Range (particle radiation)photomultiplierSettore FIS/01 - Fisica SperimentaleDetectorAstrophysics::Instrumentation and Methods for AstrophysicsDETETOREScosmic rays detectors; ultra high energy cosmic rays; Astronomy and AstrophysicsAugerobservatorycosmic rays detectorscosmic rays detectors; ultra high energy cosmic raysgeometricalAstrophysics - High Energy Astrophysical PhenomenaasymmetrylongitudinalCherenkov counter: waterairmedia_common.quotation_subjectAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesCosmic rayheliumultra high energy cosmic raysnucleus: atmosphereAsymmetry0103 physical sciencesHigh Energy Physicscosmic radiation: UHEcosmic rays detectorFLUORESCENCEAstrophysiquePierre Auger Observatoryelectron positronshowers: atmosphere010308 nuclear & particles physicsbackgrounddetector: surfaceshowers: spatial distributionparametrizationAstronomy and AstrophysicsAstronomieComputational physics13. Climate actiongamma rayExperimental High Energy Physics[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]Energy (signal processing)Journal of Cosmology and Astroparticle Physics
researchProduct

Global Estimation of Biophysical Variables from Google Earth Engine Platform

2018

This paper proposes a processing chain for the derivation of global Leaf Area Index (LAI), Fraction of Absorbed Photosynthetically Active Radiation (FAPAR), Fraction Vegetation Cover (FVC), and Canopy water content (CWC) maps from 15-years of MODIS data exploiting the capabilities of the Google Earth Engine (GEE) cloud platform. The retrieval chain is based on a hybrid method inverting the PROSAIL radiative transfer model (RTM) with Random forests (RF) regression. A major feature of this work is the implementation of a retrieval chain exploiting the GEE capabilities using global and climate data records (CDR) of both MODIS surface reflectance and LAI/FAPAR datasets allowing the global estim…

random forestsCWC010504 meteorology & atmospheric sciencesMean squared errorScience0211 other engineering and technologiesGoogle Earth Engine; LAI; FVC; FAPAR; CWC; plant traits; random forests; PROSAIL02 engineering and technologyLand cover01 natural sciencesAtmospheric radiative transfer codesRange (statistics)Parametrization (atmospheric modeling)FAPARLeaf area index021101 geological & geomatics engineering0105 earth and related environmental sciencesRemote sensingPROSAILQ15. Life on landFVCLAIRandom forestplant traits13. Climate actionPhotosynthetically active radiationGeneral Earth and Planetary SciencesEnvironmental scienceGoogle Earth EngineRemote Sensing; Volume 10; Issue 8; Pages: 1167
researchProduct