author = "Balan, Nalan and Tulasiram, S. and Kamide, Y. and Batista, Inez 
                         Staciarini and Souza, Jonas Rodrigues de and Shiokawa, K. and 
                         Rajesh, P. K. and Victor, N. J.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Indian 
                         Institute of Geomagnetism} and {Nagoya University} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Nagoya University} and {National 
                         Cheng Kung University} and {Equatorial Geophysical Research 
                title = "Automatic selection ofDst storms andtheir seasonal variations 
                         intwo versions ofDst in50years",
              journal = "Earth, Planets and Space",
                 year = "2017",
               volume = "69",
               number = "1",
                month = "Dec.",
             keywords = "Energy input, Equinoctial hypothesis, Geomagnetic Dst storms, Ring 
                         current, RM effect, Semiannual variation.",
             abstract = "A computer program is developed to automatically identify the 
                         geomagnetic storms in Dst index by applying four selection 
                         criteria that minimize non-storm-like fluctuations. The program is 
                         used to identify the storms in Kyoto Dst and USGS Dst in 50 years 
                         (1958-2007). The identified storms (DstMin \≤ -50 nT) are 
                         used to investigate their seasonal variations. It is found that 
                         the overall seasonal variations of the storm parameters such as 
                         occurrence, average intensity (average DstMin) and average 
                         strength (average \〈DstMP\〉) in both versions of 
                         Dst exhibit clear semiannual variations with equinoctial maxima 
                         and solstice minima; and the maxima and minima in intensity and 
                         strength (~17% each) are less than those in occurrence (~28%). 
                         Wavelet spectra of the storms reveal the existence of distinct 
                         semiannual component in four solar cycles (SCs 20-23) and weak 
                         longer and shorter-period components in some SCs. The semiannual 
                         variation observed also in the mean energy input during the main 
                         phase (MP) of the storms estimated from Dst is interpreted in 
                         terms of the (1) equinoctial mechanism based on the varying angle 
                         between the Earth-Sun line and Earth's dipole axis and (2) 
                         Russell-Mcpherron effect based on the varying angle between the 
                         GSM Z-axis and GSE Y-axis; and the yearly range of the dipole tilt 
                         angle \μ (23.2) involved in the equinoctial mechanism is 
                         found larger than the title angle \θ (16.3) involved in the 
                         RM effect.",
                  doi = "10.1186/s40623-017-0642-2",
                  url = "http://dx.doi.org/10.1186/s40623-017-0642-2",
                 issn = "1343-8832",
             language = "en",
           targetfile = "balan_automatic.pdf",
        urlaccessdate = "04 dez. 2020"