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<supportEmail caption="Support">icrc2007@icrc2007.unam.mx</supportEmail>
<title>30th International Cosmic Ray Conference</title>
<description>The 30th International Cosmic Ray Conference will be held from July 3, 2007 to July 11, 2007 in Merida, Yucatan, Mexico.</description>
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<closed>True</closed>
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 <name>Merida, Mexico</name>
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<startDate>2007-07-03T08:00:00</startDate>
<endDate>2007-07-11T19:00:00</endDate>
<creationDate>2005-09-26T05:04:53</creationDate>
<modificationDate>2024-04-12T17:46:55</modificationDate>
<timezone>Mexico/General</timezone>
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 <title>Weather induced effects on extensive air showers observed with the surface detector of the Pierre Auger Observatory</title>
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   <name first="-" middle="" last="The Pierre Auger Collaboration"></name>
   <organization>Pierre Auger Observatory</organization>
   <emailHash>97fdedf772e0cee185a0d6ba777bf636</emailHash>
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   <title>Dr.</title>
   <name first="Carla" middle="" last="Bleve"></name>
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   <emailHash>d41d8cd98f00b204e9800998ecf8427e</emailHash>
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  <name>Merida, Mexico</name>
  <address></address>
  <room>Regency (Hyatt)</room>
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 <startDate>2007-07-04T14:45:00</startDate>
 <endDate>2007-07-04T14:45:00</endDate>
 <abstract>The rate of events measured with the surface detector (SD) of the Pierre Auger
Observatory is found to be 
modulated by the weather conditions. This effect, observed in different ranges of
S(1000), the signal 
measured at 1000 m from the shower core, is due to  the increasing amount of matter
traversed by a shower 
as the ground pressure increases and to the inverse proportionality of the Moliere
radius to the air density 
near ground. The latter effect results in a modulation of the lateral spread of the
shower with T and P. Air-
shower simulations with different realistic profiles of the atmosphere support this
interpretation of the 
observed effects.</abstract>
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