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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Near 13.5-day periodicity in Muon Detector data during late 2001 and early 2002

Full text
Author(s):
Vieira, Lucas R. [1] ; Dal Lago, Alisson [1] ; Rigozo, Nivaor R. [2] ; da Silva, Marlos R. [3] ; Braga, Carlos R. [1] ; Petry, Adriano [2] ; Schuch, Nelson J. [2]
Total Authors: 7
Affiliation:
[1] Natl Inst Space Res INPE MCTI, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[2] Fed Univ Maria LACESM CT UFSM, So Reg Space Res Ctr CRS CCR INPE MCTI, Collaborat Space Sci Lab, BR-97105900 Santa Maria, RS - Brazil
[3] Univ Vale Paraiba UNIVAP, BR-12244000 Sao Jose Dos Campos - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Advances in Space Research; v. 49, n. 11, p. 1615-1622, JUN 1 2012.
Web of Science Citations: 5
Abstract

In this study we perform a continuous Morlet wavelet transform method in time series of secondary cosmic rays and 1 AU interplanetary medium parameters for the interval from October 2001 to October 2002. The near 13.5-day periodicity was obtained during late 2001, and it was remarkable for muon data. Even though some works have pointed out that the main activations of the 13.5 day recurrence in near-Earth solar wind are related, e.g., with the heliosheet crossings or to the occurrence at 1 AU of two high speed streams approximately 180 degrees apart in solar longitude per solar rotation, we aim to show that the period of about half the solar rotation during the end months of 2001 present in muon time series was apparently due to the occurrence of non-recurrent interplanetary disturbances. The interconnections among successive Forbush decreases, recovery phases and gradual muon depressions (associated with corotating interaction regions) seem to play an important role in such 13.5-day periodicity. (C) 2012 COSPAR. Published by Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 09/12869-6 - Study of the secondary cosmic rays time series through the spectral and wavelets analysis
Grantee:Lucas Ramos Vieira
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 08/08840-0 - Study of solar-interplanetary-geomagnetic disturbances using satellite data and Global Muon Detector Network (GMDN) observations for Space Weather applications
Grantee:Carlos Roberto Braga
Support Opportunities: Scholarships in Brazil - Master