Solar modulation in surface atmospheric electricity

被引：38

作者：

Harrison, R. Giles ^{[1
]}

Usoskin, Ilya ^{[2
]}

机构：

[1] Univ Reading, Dept Meteorol, Reading RGS 6BB, Berks, England

[2] Univ Oulu, Sodankyla Geophys Observ, Oulu Unit, FIN-90014 Oulu, Finland

来源：

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS | 2010年 / 72卷 / 2-3期

基金：

美国国家科学基金会;

关键词：

Solar-terrestrial coupling; Cosmic rays; Solar variability; Layer cloud charging; AIR-EARTH CURRENT; TERM CHANGES; CIRCUIT; RESISTANCE;

D O I：

10.1016/j.jastp.2009.11.006

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The solar wind modulates the flux of galactic cosmic rays impinging on Earth inversely with solar activity. Cosmic ray ionisation is the major source of air's electrical conductivity over the oceans and well above the continents. Differential solar modulation of the cosmic ray energy spectrum modifies the cosmic ray ionisation at different latitudes, varying the total atmospheric columnar conductance. This redistributes current flow in the global atmospheric electrical circuit, including the local vertical current density and the related surface potential gradient. Surface vertical current density and potential gradient measurements made independently at Lerwick Observatory, Shetland, from 1978 to 1985 are compared with modelled changes in cosmic ray ionisation arising from solar activity changes. Both the lower troposphere atmospheric electricity quantities are significantly increased at cosmic ray maximum (solar minimum), with a proportional change greater than that of the cosmic ray change. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：176 / 182

页数：7

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