Statistical analysis of solar wind parameter variation with heliospheric distance: Ulysses observations in the ecliptic plane

Autor(es)

Echer, E. ^[1] ; Bolzan, M. J. A. ^[2] ; Franco, A. M. S. ^[1]

Afiliação do(s) autor(es)

^[1] Natl Inst Space Res INPE, Sao Jose Dos Campos - Brazil

^[2] Fed Univ Jatai, Jatai - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Advances in Space Research; v. 65, n. 12, p. 2846-2856, JUN 15 2020.
• Citações Web of Science: 0

Resumo

The interplanetary magnetic field magnitude B-o, proton density N-p and solar wind speed V, data from Ulysses spacecraft during its interplanetary cruise interval from Earth to Jupiter, from 18 November 1990 to 31 January 1992, are analyzed in this study. Statistical and wavelet techniques are employed to characterize some properties from the solar wind parameters near the ecliptic plane and their dependence with radial distance. The results from kurtosis analysis showed that the three solar wind parameters (B-o, and N-p and V-sw) presented a decrease of this statistical quantity with the increase of scales, indicating that these variables are intermittent in short time scales. Further, the kurtosis parameter presented an increase in all scales around 2-3 AU distance range that corresponds to a solar wind regime transition. It was noted that the interplanetary medium was dominated by solar transients (interplanetary coronal mass ejections) until the middle of 1991. Afterwards a more stable pattern of corotating interaction regions arose. Furthermore, the probability distribution functions presented a spreading shape due to the occurrence of intermittence. In order to study the temporal variability of the solar wind parameters, the wavelet approach was used. The following major periodicities were found for the three solar wind variables studied: similar to 13, similar to 26, and similar to 83-88 days. It was noted that the similar to 13 day periods presented strong spectral power in the 2 to 4 AU range, where the solar wind was dominated by ICME transients. On the other hand, the 26 day period shows higher spectral power for distances higher than 4 AU, where the interplanetary space is more dominated by CIRs. Thus, it was found in this paper a significant dependence of solar wind parameters on radial heliocentric distance which can be accounted by the dynamical evolution of solar wind structures with distance. (C) 2020 COSPAR. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 17/00516-8 - Estudo da oscilação de elétrons na bainha magnética de marte com observações da sonda mars express
• Beneficiário: Adriane Marques de Souza Franco
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 18/21657-1 - Estudo da variabilidade da atividade auroral em rádio da magnetosfera de Júpiter
• Beneficiário: Ezequiel Echer
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/10794-2 - Estudo da oscilação de elétrons na bainha magnética de marte
• Beneficiário: Adriane Marques de Souza Franco
• Modalidade de apoio: Bolsas no Brasil - Doutorado