104 research outputs found
First Experimental Characterization of Microwave Emission from Cosmic Ray Air Showers
We report the first direct measurement of the overall characteristics of
microwave radio emission from extensive air showers. Using a trigger provided
by the KASCADE-Grande air shower array, the signals of the microwave antennas
of the CROME (Cosmic-Ray Observation via Microwave Emission) experiment have
been read out and searched for signatures of radio emission by high-energy air
showers in the GHz frequency range. Microwave signals have been detected for
more than 30 showers with energies above 3*10^16 eV. The observations presented
in this Letter are consistent with a mainly forward-directed and polarised
emission process in the GHz frequency range. The measurements show that
microwave radiation offers a new means of studying air showers at energies
above 10^17 eV.Comment: Accepted for publication in PR
KCDC - The KASCADE Cosmic-ray Data Centre
KCDC, the KASCADE Cosmic-ray Data Centre, is a web portal, where data of
astroparticle physics experiments will be made available for the interested
public. The KASCADE experiment, financed by public money, was a large-area
detector for the measurement of high-energy cosmic rays via the detection of
air showers. KASCADE and its extension KASCADE-Grande stopped finally the
active data acquisition of all its components including the radio EAS
experiment LOPES end of 2012 after more than 20 years of data taking. In a
first release, with KCDC we provide to the public the measured and
reconstructed parameters of more than 160 million air showers. In addition,
KCDC provides the conceptional design, how the data can be treated and
processed so that they are also usable outside the community of experts in the
research field. Detailed educational examples make a use also possible for
high-school students and early stage researchers.Comment: 8 pages, accepted proceeding of the ECRS-symposium, Kiel, 201
Applying Shower Development Universality to KASCADE Data
On basis of the theorem of a universal shower development stating that a
hadronically generated extensive air shower is completely described by the
primary energy, the position of the shower maximum and a parameter related to
the total muon number, the so-called correlation curve method is developed and
applied to KASCADE data. Correlation information of the muon and electron
content of showers measured by the KASCADE experiment are used for the
reconstruction of energy and mass of primary cosmic rays. Systematic
uncertainties of the method and the results are discussed in detail. It is
shown that by this method general tendencies in spectrum and composition indeed
can be revealed, but the absolute normalization in energy and mass scale
requires much more detailed simulations.Comment: article accepted for publication in Astroparticle Physic
VUV-absorption cross section of carbon dioxide from 150 to 800 K and applications to warm exoplanetary atmospheres
The KASCADE-Grande energy spectrum of cosmic rays and the role of hadronic interaction models
- …