@Article{EcherBolzFran:2020:UlObEc,
               author = "Echer, Ezequiel and Bolzan, Maur{\'{\i}}cio J. A. and Franco, 
                         Adriane Marques de Souza",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Universidade Federal de Jata{\'{\i}}} and {Instituto Nacional 
                         de Pesquisas Espaciais (INPE)}",
                title = "Statistical analysis of solar wind parameter variation with 
                         heliospheric distance: Ulysses observations in the ecliptic 
                         plane",
              journal = "Advances in Space Research",
                 year = "2020",
               volume = "65",
               number = "12",
                pages = "2846--2856",
                month = "June",
             keywords = "Solar wind turbulence, Ulysses spacecraft, Kurtosis technique, 
                         Wavelet analysis.",
             abstract = "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.",
                  doi = "10.1016/j.asr.2020.03.036",
                  url = "http://dx.doi.org/10.1016/j.asr.2020.03.036",
                 issn = "0273-1177 and 1879-1948",
             language = "en",
           targetfile = "echer_statistical.pdf",
        urlaccessdate = "25 abr. 2024"
}