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Vertical profile measurements of lower troposphere ionisation

Harrison, R. G., Nicoll, K. A. and Aplin, K. L. (2014) Vertical profile measurements of lower troposphere ionisation. Journal of Atmospheric and Solar-Terrestrial Physics, 119. pp. 203-210. ISSN 1364-6826

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To link to this article DOI: 10.1016/j.jastp.2014.08.006

Abstract/Summary

Vertical soundings of the atmospheric ion production rate have been obtained from Geiger counters integrated with conventional meteorological radiosondes. In launches made from Reading (UK) during 2013-2014, the Regener-Pfotzer ionisation maximum was at an altitude equivalent to a pressure of (63.1±2.4) hPa, or, expressed in terms of the local air density, (0.101±0.005) kgm−3. The measured ionisation profiles have been evaluated against the Usoskin-Kovaltsov model and, separately, surface neutron monitor data from Oulu. Model ionisation rates agree well with the observed cosmic ray ionisation below 20 km altitude. Above 10 km, the measured ionisation rates also correlate well with simultaneous neutron monitor data, although, consistently with previous work, measured variability at the ionisation maximum is greater than that found by the neutron monitor. However, in the lower atmosphere (below 5 km altitude), agreement between the measurements and simultaneous neutron monitor data is poor. For studies of transient lower atmosphere phenomena associated with cosmic ray ionisation, this indicates the need for in situ ionisation measurements and improved lower atmosphere parameterisations.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:37480
Uncontrolled Keywords:Radiosonde; Atmospheric ions; Neutron monitor; Galactic cosmic rays
Publisher:Elsevier

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