@article {5006,
	title = {Study of small ions concentration in the air above Athens, Greece},
	journal = {Atmospheric Research},
	volume = {91},
	year = {2009},
	note = {Cited By :13Export Date: 2 November 2015Correspondence Address: Retalis, A.; National Observatory of Athens, Institute for Environmental Research and Sustainable Development, I. Metaxa and V. Pavlou, GR 152-36, Palaia Pendeli, Athens, Greece; email: adrianr@meteo.noa.grReferences: Cobb, W.E., The atmospheric electric climate at Mauna Loa Observatory, Hawaii (1968) J. Atmos. Sci., 25, pp. 470-480;Dhanorkar, S., Kamra, A.K., Measurement of mobility spectrum and concentration of all atmospheric ions with a single apparatus (1991) J. Geophys. Res., 96, pp. 18671-18678; 
Dhanorkar, S., Kamra, A.K., Diurnal variations of the mobility spectrum of ions and size distribution of fine aerosols in the atmosphere (1993) J. Geophys. Res., 98, pp. 2639-2650; 
Dhanorkar, S., Kamra, A.K., Diurnal and seasonal variations of the small-, intermediate-, and large-ion concentrations and their contributions to polar conductivity (1993) J. Geophys. Res., 98, pp. 14895-14908; 
Dolezalek, ., (1991) The World Data Centre for Atmospheric Electricity, and Global Change Monitoring, , Office of Naval Research, European Office, London, U.K; 
Gagaoudaki, H., (1979) Surface Wind as a Climatological Factor Affecting Transportation and Dispersion of Pollutants in Athens Area, , National Meteorological Service 7, Athens; 
(1989) Technical report, 2; 
Hoppel, W.A., Anderson, R.V., Willett, J.C., Atmospheric electricity in the planetary boundary layer (1986) The Earth{\textquoteright}s Electrical Environment, pp. 149-165. , National Academy Press, Washington, D.C; 
H{\~o}rrak, U., Air ion mobility spectrum at a rural area (2001) Diss. Geophys. Univ. Tartu, 91; 
H{\~o}rrak, U., Iher, H., Luts, A., Salm, J., Tammet, H., Mobility spectrum of air ions at Tahkuse Observatory (1994) J. Geophys. Res., 99, pp. 10,697-10,700; 
H{\~o}rrak, U., Salm, J., Tammet, H., Bursts of intermediate ions in atmospheric air (1998) J. Geophys. Res., 103, pp. 13909-13925; 
H{\~o}rrak, U., Mirme, A., Salm, J., Tamm, E., Tammet, H., Air ion measurements as a source of information about atmospheric aerosols (1998) Atmos. Res., 46, pp. 233-242; 
H{\~o}rrak, U., Salm, J., Tammet, H., Statistical characterization of air ion mobility spectra at Tahkuse Observatory: classification of air ions (2000) J. Geophys. Res., 105, pp. 9291-9302; 
H{\~o}rrak, U., Salm, J., Tammet, H., Diurnal variation in the concentration of air ions of different mobility classes in a rural area (2003) J. Geophys. Res., 108, p. 4653; 
Israel, H., Atmospheric electricity (1971) Israel Program for Scientific Translations, Jerusalem, 1, p. 129; 
Israelsson, S., Tammet, H., Variation of fair weather atmospheric electricity at Marsta Observatory, Sweden, 1993-1998 (2001) J. Atmos. Terr. Phys., 63, pp. 1693-1703; 
Kamra, K.A., Effect of wind diurnal and seasonal variations of atmospheric electric field (1969) J. Atmos. Terr. Phys., 31, p. 1281; 
Lalas, D., Asimakopoulos, D., Deligiorgi, D., Helmis, C., Sea breeze circulation and photochemical pollution in Athens, Greece (1983) Atmos. Environ., 17, pp. 1621-1632; 
M{\"u}hleisen, R., (1965) Problems of Atmospheric and Space Electricity, , Elsevier, New York; 
P.E.P.C. (Program for the Environmental Pollution Control), The air pollution over Athens area (1989) Technical Report, I, p. 36. , Base Information Ministry of Environment, Land Planning and Public Works, Athens; 
Ralston, A., Wilf, H., Mathematical Methods for Digital Computers (1960) Ch. 24, , Wiley, New York; 
Reiter, R., Frequency distribution of positive and negative small ion concentrations, based on many years{\textquoteright} recordings at two mountain stations, located at 740 and 1780~m ASL (1985) Int. J. Biometeorol., 29, pp. 223-231; 
Retalis, D.A., 1974. Study of the Potential Gradient of the Electric Field Above Athens Area. Dr. Sci. Thesis, University of AthensRetalis, D., On the relationship between small atmospheric ions concentration and (1) smoke, (2) sulfur dioxide and (3) wind speed (1977) Pure Appl. Geophys., 115, pp. 575-581; 
Retalis, D., Study of large ions concentration in the air above Athens (1983) Arch. Met. Geoph. Biocl., Ser. A, 32; 
Retalis, D., Chernobyl reactor accident consequences on small atmospheric ions concentration above Athens (1987) Pure Appl. Geophys., 125, pp. 669-678; 
Retalis, D., Pitta, A., Effects on electrical parameters at Athens, Greece, by radioactive fallout from a nuclear power plant accident (1989) J. Geophys. Res., 94, pp. 13093-13097; 
Retalis, D., Retalis, A., Effects of air pollution and wind on the large-ion concentration in the air above Athens (1998) J. Geophys. Res., 103, pp. 13927-13932; 
Retalis, D., Pitta, A., Psallidas, P., The conductivity of the air and other electrical parameters in relation to meteorological elements and air pollution in Athens (1991) Meteorol. Atmos. Phys., 46, pp. 197-204; 
Runhke, L., The global atmospheric electric circuit and GAEM (1991) J. Geomac. Geoelectr., 43; 
Salm, J., The average mobility spectrum of large ions of the troposphere (1988) Res. Lett. Atmos. Electr., 8, pp. 21-24; 
Saxer, L., Sigrist, W., (1966) Die Luftelektrische Station in Aarau, , Schweig; 
Tammet, H., Size and mobility of nanometer particles, clusters and ions (1995) J. Aerosol Sci., 26, pp. 459-475; 
Tuomi, T.J., Ten year summary 1977-1986 of atmospheric electricity measured at Helsinki-Vantaa airport, Finland (1989) Geophysica, 25, pp. 1-20; 
Whipple, F.J.W., Potential gradient and atmosphere pollution. The influence of summer time (1929) Quart. J. R. Met. Soc., 55, p. 351; 
Williams, E., Renno, M., Conditional instability. Tropical lightning, lonospheric potential and global change (1991) Nineteenth Conference of Hurricanes and Tropical Meteorology. 6-10 May 1991, , Miami Florida
},
	month = {2009},
	pages = {219 - 228},
	abstract = {Measurements of positive and negative small atmospheric ion concentrations have been made regularly since 1968 at the National Observatory of Athens (NOA). In this paper the 17-year period 1968-1984 is summarized. The diurnal and annual variations are examined, and Fourier analysis is also used for the study of the diurnal variation. The concentrations of small ions follow a double diurnal course. The maxima occur near 3-5~h and 13-16~h local time (LT = GMT + 2~h). The minima are observed at 6-8~h and 21-23~h. The annual course of small ions presents maximum concentration values around the summer season. The mean of the small ion concentration (SIC) for the 17-year period (1968-1984) is n+ = 188.8~ions/cm3 for positive ions and n- = 151.1~ions/cm3 for negative ions. Their ratio is equal to 1.25. The year-to-year variation of SIC for the examined period shows a negative trend. The results from multiple regression analysis show that wind speed and SIC are positively correlated, while relative humidity, smoke and sulphur dioxide are negatively correlated. {\textcopyright} 2008 Elsevier B.V. All rights reserved.},
	keywords = {Air pollution, Air quality, annual variation, Athens, Athens [Attica], Atmospheric electricity, Atmospheric humidity, Atmospherics, Attica, diurnal variation, Eurasia, Europe, Forestry, Fourier analysis, Greece, ion, Ions, Meteorology, Moisture, Regression Analysis, Relative humidity, Small ions, Smoke, Southern Europe, Sulfur, Sulfur determination, Sulfur dioxide, Sulphur dioxide, Turbulent flow, Wave interference, Wind effects, Wind speed, wind velocity},
	isbn = {01698095 (ISSN)},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-58149484018\&partnerID=40\&md5=f65ed604963c487e6dbc9941bd16f8e4},
	author = {Retalis, A. and Nastos, P. and Retalis, D.}
}
