Variation of sporadic meteor background and solar activity V. Porubčan, P. Zigo, M. Buček, G. Cevolani and G. Trivellone Eur. Phys. J. Plus, 126 5 (2011) 46 Published online: 06 May 2011 DOI: 10.1140/epjp/i2011-11046-4