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Space weather driven changes in lower atmosphere phenomena

Harrison, R. G., Nicoll, K. A. and McWilliams, K. A. (2013) Space weather driven changes in lower atmosphere phenomena. Journal of Atmospheric and Solar-Terrestrial Physics, 98. pp. 22-30. ISSN 1364-6826

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To link to this article DOI: 10.1016/j.jastp.2013.03.008

Abstract/Summary

During a period of heliospheric disturbance in 2007-9 associated with a co-rotating interaction region (CIR), a characteristic periodic variation becomes apparent in neutron monitor data. This variation is phase locked to periodic heliospheric current sheet crossings. Phase-locked electrical variations are also seen in the terrestrial lower atmosphere in the southern UK, including an increase in the vertical conduction current density of fair weather atmospheric electricity during increases in the neutron monitor count rate and energetic proton count rates measured by spacecraft. At the same time as the conduction current increases, changes in the cloud microphysical properties lead to an increase in the detected height of the cloud base at Lerwick Observatory, Shetland, with associated changes in surface meteorological quantities. As electrification is expected at the base of layer clouds, which can influence droplet properties, these observations of phase-locked thermodynamic, cloud, atmospheric electricity and solar sector changes are not inconsistent with a heliospheric disturbance driving lower troposphere changes.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > Department of Meteorology
ID Code:32243
Uncontrolled Keywords:Atmospheric electricity; Cloud microphysics; Co-rotating interaction regions; Solar–terrestrial coupling
Publisher:Pergamon

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