Search Results - "Tammet, H."

Continuous scanning of the mobility and size distribution of charged clusters and nanometer particles in atmospheric air and the Balanced Scanning Mobility Analyzer BSMA by Tammet, H.

“…Measuring of charged nanometer particles in atmospheric air is a routine task in research on atmospheric electricity, where these particles are called the…”
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Symmetric Inclined Grid Mobility Analyzer for the Measurement of Charged Clusters and Fine Nanoparticles in Atmospheric Air by Tammet, H.

“…The Symmetric Inclined Grid Mobility Analyzer (SIGMA) was developed for applications in atmospheric aerosol nucleation research with special attention to…”
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Atmospheric ions and nucleation: a review of observations by Hirsikko, A., Nieminen, T., Gagné, S., Lehtipalo, K., Manninen, H. E., Ehn, M., Hõrrak, U., Kerminen, V.-M., Laakso, L., McMurry, P. H., Mirme, A., Mirme, S., Petäjä, T., Tammet, H., Vakkari, V., Vana, M., Kulmala, M.

“…This review is based on ca. 260 publications, 93 of which included data on the temporal and spatial variation of the concentration of small ions (<1.6 nm in…”
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A joint dataset of fair-weather atmospheric electricity by Tammet, H.

“…A new open access dataset ATMEL2007A ( http://ael.physic.ut.ee/tammet/dd/) takes advantage of the diary-type data structure. The dataset comprises the…”
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Estimating neutral nanoparticle steady-state size distribution and growth according to measurements of intermediate air ions by Tammet, H, Komsaare, K, Hõrrak, U

“…Continuous measurements of intermediate air ion size distributions were carried out in the small town Tartu, Estonia, from 1 April 2010 through 7 November…”
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Negatively charged nanoparticles produced by splashing of water by Tammet, H., Hõrrak, U., Kulmala, M.

“…The production of splashing-generated balloelectric intermediate ions was studied by means of mobility spectrometry in the atmosphere during the rain and in a…”
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Initial steps of aerosol growth by Kulmala, M., Laakso, L., Lehtinen, K. E. J., Riipinen, I., Dal Maso, M., Anttila, T., Kerminen, V.-M., Hõrrak, U., Vana, M., Tammet, H.

“…The formation and growth of atmospheric aerosols depend on several steps, namely nucleation, initial steps of growth and subsequent – mainly condensational –…”
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Simulation tool for atmospheric aerosol nucleation bursts by Tammet, H., Kulmala, M.

“…A numerical model for atmospheric aerosol nucleation bursts is presented as a tool for the analysis of measurements. It includes a minimum of physical…”
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Ion production rate in a boreal forest based on ion, particle and radiation measurements by Laakso, L., Petäjä, T., Lehtinen, K. E. J., Kulmala, M., Paatero, J., Hõrrak, U., Tammet, H., Joutsensaari, J.

“…In this study the ion production rates in a boreal forest were studied based on two different methods: 1) cluster ion and particle concentration measurements,…”
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Factors of air ion balance in a coniferous forest according to measurements in Hyytiälä, Finland by Tammet, H., Hõrrak, U., Laakso, L., Kulmala, M.

“…A new mathematical model describing air ion balance was developed and tested. It has improved approximations and includes dry deposition of ions onto the…”
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Statistical characterization of air ion mobility spectra at Tahkuse Observatory: Classification of air ions by Hõrrak, U., Salm, J., Tammet, H.

“…A database of 8615 hourly averaged air ion mobility spectra in the range of 0.00041–3.2 cm2 V−1 s−1 was measured at Tahkuse Observatory, Estonia, during 14…”
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Variation and balance of positive air ion concentrations in a boreal forest by Hõrrak, U., Aalto, P. P., Salm, J., Komsaare, K., Tammet, H., Mäkelä, J. M., Laakso, L., Kulmala, M.

“…Air ions are characterized on the basis of measurements carried out in a boreal forest at the Hyytiälä SMEAR station, Finland, during the BIOFOR III campaign…”
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Electrical aerosol spectrometer of Tartu University by Tammet, H., Mirme, A., Tamm, E.

“…The electrical aerosol spectrometer (EAS) of the parallel measuring principle at Tartu University is an efficient instrument for rapid measurement of the…”
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Reduction of air ion mobility to standard conditions by Tammet, H.

“…The Langevin rule of the reduction of air ion mobility is adequate in case of zero‐size ions. An alternative is the Stokes‐Millikan equation that is adequate…”
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Bursts of intermediate ions in atmospheric air by Hõrrak, U., Salm, J., Tammet, H.

“…The mobility spectrum of air ions has been measured at Tahkuse Observatory in Estonia for several years. The average concentration of intermediate ions with…”
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Variation of fair weather atmospheric electricity at Marsta Observatory, Sweden, 1993–1998 by Israelsson, S, Tammet, H

“…A modified atmospheric electrical station of the Kasemir–Dolezalek construction is continuously operating in the Marsta Observatory (59°56′N,17°35′W) located…”
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Charging state of atmospheric nanoparticles during the nucleation burst events by Vana, M., Tamm, E., Hõrrak, U., Mirme, A., Tammet, H., Laakso, L., Aalto, P.P., Kulmala, M.

“…In this work, the charging state of atmospheric nanoparticles was estimated through simultaneous measurements of aerosol size distribution and air ions…”
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Effect of atmospheric electricity on dry deposition of airborne particles from atmosphere by Tammet, H., Kimmel, V., Israelsson, S.

“…The electric mechanism of dry deposition is well known in the case of unattached radon daughter clusters that are unipolar charged and of high mobility. The…”
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Variation of atmospheric air pollution under conditions of rapid economic change—Estonia 1994–1999 by Kimmel, V, Tammet, H, Truuts, T

“…Estonia is an example of a country with economy in transition whose atmospheric air pollution has been remarkably influenced by economic changes. During the…”
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The effect of magnetic substorms on near-ground atmospheric current by BELOVA, E, KIRKWOOD, S, TAMMET, H

“…Ionosphere-magnetosphere disturbances at high latitudes, e.g. magnetic substorms, are accompanied by energetic particle precipitation and strong variations of…”
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