%0 Journal Article
%A Arganda, E.
%A Arqueros Martínez, Fernando
%A Blanco Ramos, Francisco
%A García Pinto, Diego
%A Ortiz Ramis, Montserrat
%A Rosado Vélez, Jaime
%A Vázquez Peñas, José Ramón
%T Search for first harmonic modulation in the right ascension distribution of cosmic rays detected at the Pierre Auger Observatory
%D 2011
%@ 0927-6505
%U https://hdl.handle.net/20.500.14352/45110
%X We present the results of searches for dipolar-type anisotropies in different energy ranges above 2.5 x 10(17) eV with the surface detector array of the Pierre Auger Observatory, reporting on both the phase and the amplitude measurements of the first harmonic modulation in the right-ascension distribution. Upper limits on the amplitudes are obtained, which provide the most stringent bounds at present, being below 2% at 99% C.L. for EeV energies. We also compare our results to those of previous experiments as well as with some theoretical expectations. (C) 2011 Elsevier B.V. All rights reserved.
%~