CORE
🇺🇦
make metadata, not war
Services
Services overview
Explore all CORE services
Access to raw data
API
Dataset
FastSync
Content discovery
Recommender
Discovery
OAI identifiers
OAI Resolver
Managing content
Dashboard
Bespoke contracts
Consultancy services
Support us
Support us
Membership
Sponsorship
Community governance
Advisory Board
Board of supporters
Research network
About
About us
Our mission
Team
Blog
FAQs
Contact us
The shape of the radio wavefront of extensive air showers as measured with LOFAR
Authors
A Alexov
J Anderson
+79 more
IM Avruch
ME Bell
MJ Bentum
G Bernardi
P Best
A Bonafede
F Breitling
J Broderick
M Bruegen
S Buitink
HR Butcher
B Ciardi
A Corstanje
F de Gasperin
E de Geus
M de Vos
S Duscha
J Eisloeffel
D Engels
JE Enriquez
H Falcke
RA Fallows
C Ferrari
W Frieswijk
MA Garrett
J Griessmseier
AW Gunst
JP Hamaker
M Hoeft
A Homeffer
JR Horandel
M Icobelli
E Juette
A Karastergiou
J Kohler
VI Kondratiev
M Krause
M Kuniyoshi
G Kuper
P Maat
G Mann
R McFadden
D McKay-Bukowski
M Mevius
H Munk
A Nelles
MJ Norden
E Orru
H Paas
VN Pandey
M Pandey-Pommier
R Pizzo
AG Polatidis
JP Rachen
W Reich
H Rottgering
AMM Scaife
P Schellart
O Scholten
D Schwarz
O Smirnov
M Steinmetz
A Stewart
J Swinbank
M Tagger
Y Tang
C Tasse
S ter Veen
S Thoudam
C Toribio
TNG Trinh
M van den Akker
RJ van Weeren
R Vermeulen
C Vocks
SJ Wijnholds
O Wucknitz
S Yatawatta
P Zarka
Publication date
1 January 2015
Publisher
'Elsevier BV'
Abstract
Extensive air showers, induced by high energy cosmic rays impinging on the Earth's atmosphere, produce radio emission that is measured with the LOFAR radio telescope. As the emission comes from a finite distance of a few kilometers, the incident wavefront is non-planar. A spherical, conical or hyperbolic shape of the wavefront has been proposed, but measurements of individual air showers have been inconclusive so far. For a selected high-quality sample of 161 measured extensive air showers, we have reconstructed the wavefront by measuring pulse arrival times to sub-nanosecond precision in 200 to 350 individual antennas. For each measured air shower, we have fitted a conical, spherical, and hyperboloid shape to the arrival times. The fit quality and a likelihood analysis show that a hyperboloid is the best parameterization. Using a non-planar wavefront shape gives an improved angular resolution, when reconstructing the shower arrival direction. Furthermore, a dependence of the wavefront shape on the shower geometry can be seen. This suggests that it will be possible to use a wavefront shape analysis to get an additional handle on the atmospheric depth of the shower maximum, which is sensitive to the mass of the primary particle. © 2014 Elsevier B.V. All rights reserved
Similar works
Full text
Available Versions
Supporting member
Oxford University Research Archive
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:ora.ox.ac.uk:uuid:07168f8b...
Last time updated on 30/09/2015