eng Ansari Education and Research Society Journal of Ultra Scientist of Physical Sciences December 2009 21 3 533 536 jusps-B 1165 article KAMLESH SINGH 1 PANKAJ K. SHRIVASTAVA (pankaj_in_2001@rediffmail.com) 1 Department of Physics, Govt. P.G. Science College, Rewa - 486 001 (INDIA) <p style="text-align: justify;">Cosmic ray neutron monitor data of Haleakala station are used for an extensive study of cosmic ray diurnal and semi-diurnal variation for the period of 1995 to 2006. We have derived an average characteristics of first two harmonics of cosmic ray daily variation. The amplitude of the diurnal/semi diurnal variation has an eleven year cycle. Time of maxima exhibits a 22 year cycle for diurnal anisotropy</p> https://ultraphysicalsciences.org/paper/1165/ average characteristics cosmic ray daily variation period of 1995 to 2006