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SUMMARY:High Energy Atmospheric Ionisation and Clouds - Giles Harrison\, D
 epartment of Meteorology\, University of Reading
DTSTART:20090113T150000Z
DTEND:20090113T160000Z
UID:TALK15340@talks.cam.ac.uk
CONTACT:Chris Jones
DESCRIPTION:Cosmic rays generate molecular cluster ions throughout the atm
 osphere\,\nand are the principal source of lower atmosphere ionisation. Cl
 uster\nions cause the electrical conductivity of atmospheric air\, which p
 ermits\ncurrents to flow continuously from disturbed weather (thunderstorm
 )\nareas to fair weather regions. It has been suggested that cosmic ray\nc
 hanges are linked with cloud\, through the influence of atmospheric\nclust
 er ions. As clouds have an appreciable influence on climate\, the\nglobal 
 nature of  cosmic ray ionisation could result in climate effects.\nTwo phy
 sical processes identified as important are: (1) production of\nultra-fine
  aerosol particles by high energy ionisation and (2) the\neffect of aeroso
 l particle and droplet charging at cloud boundaries.\nMechanisms have been
  theoretically established to support both these\nprocesses\, and evidence
  from experimental data is becoming available.\nThis talk will consider ef
 fects of cosmic ray ionisation on aerosols and\nclouds.
LOCATION:Rutherford Seminar Room B
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