@Article{Kane:2009:HiAmAn,
               author = "Kane, Rajaram Purushottam",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "High amplitude anisotropic events (HAE) in cosmic ray diurnal 
                         variation during Solar cycle 23",
              journal = "Indian Journal of Radio and Space Physics",
                 year = "2009",
               volume = "38",
               number = "4",
                pages = "189--196",
                month = "Aug.",
             keywords = "cosmic ray diurnal variation, high amplitude anisotropic event 
                         (HAE), low amplitude anisotropic event (LAE), solar cycle 23.",
             abstract = "Cosmic ray (CR) intensity shows significant diurnal variations of 
                         day-to-day most probable amplitudes of ~0.5% (annual vector 
                         averages <0.35%), often with wave trains of high amplitude 
                         anisotropic events (HAEs) and low amplitude anisotropic events 
                         (LAEs). Using the pressure-corrected data for the neutron monitor 
                         at Calgary (51oN, 114oW, cut-off rigidity 1.09 GV) during Solar 
                         cycle 23 (1996-2005), trends were removed by subtracting 24-hour 
                         running means from the hourly values. In the residues, days were 
                         searched when the maximum value of the diurnal amplitudes exceeded 
                         1.0%. It was noticed that there were several HAE single events 
                         (amplitude exceeding 1.0% only on one day, not on the previous or 
                         succeeding day), double events (amplitudes exceeding 1.0% on two 
                         successive days), triple events (three successive days), and so 
                         on, with some having 10 or more days in succession. These events 
                         occurred at all levels and phases of CR variations, namely when CR 
                         daily values were almost constant for several days, or when daily 
                         values decreased slowly or increased slowly (few percent in 
                         several days, including 27-day variations) or just before the 
                         start of a Forbush decrease (FD) or during the recovery of a FD 
                         (During the main phase of sharp, strong FDs, the diurnal variation 
                         is highly distorted and difficult to access, hence omitted from 
                         the study). The occurrence of HAEs was found to be unrelated to 
                         geomagnetic indices or any interplanetary near-Earth parameters 
                         and is probably related to features in remote regions of the 
                         heliosphere.",
                 issn = "0367-8393 and 0975-105X",
             language = "en",
           targetfile = "IJRSP 38(4) 189-196.pdf",
        urlaccessdate = "16 jun. 2024"
}