title: On quasi-periodic variations of low-energy cosmic rays observed near earth.
abstract: Cosmic ray (CR) may partially, especially at high altitudes, contribute to the dosimetric characteristics. Along with irregular CR variations as Forbush decreases and solar particle events are, the quasi-periodic variations may be of some relevance too. A very short review (with references to original papers) of the present knowledge of various types of such variations is presented, namely (i) diurnal wave, (ii) ~27 d variability due to the solar rotation, (iii) Rieger-type periodicity, and (iv) quasi-biennial oscillations as well as waves on longer time scales related to solar activity and to polarity of magnetic field of the Sun. Variability is illustrated in measurements of secondary CR on the ground including the high-altitude observations at Lomnický štít.
authors.affiliation: Slovak Academy of Sciences, Institute of Experimental Physics, Watsonova 47, Košice 04001, Slovakia kkudela@upjs.sk kkudela@kosice.upjs.sk.
authors.forename: Karel
authors.initials: K
authors.lastname: Kudela
authors.affiliation: Slovak Academy of Sciences, Institute of Experimental Physics, Watsonova 47, Košice 04001, Slovakia.
authors.forename: Ronald
authors.initials: R
authors.lastname: Langer
mesh_terms: D000531:Altitude; D003359:Cosmic Radiation; D018534:Earth, Planet; D005583:Fourier Analysis; D010507:Periodicity; D011834:Radiation Monitoring; D011874:Radiometry; D012621:Seasons; D019445:Solar Activity; D013997:Time Factors; D058067:Wavelet Analysis