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SUMMARY:The yearly and seasonal variations from 7-year data set of daily c
 osmogenic nuclide Be-7 concentrations in the atmosphere
DTSTART;VALUE=DATE-TIME:20070707T143000Z
DTEND;VALUE=DATE-TIME:20070707T144200Z
DTSTAMP;VALUE=DATE-TIME:20261017T124300Z
UID:indico-contribution-556@cern.ch
DESCRIPTION:Speakers: Mr. KIKUCHI\, Satoshi (Department of Physics Yamagat
 a University)\nBe-7 is produced by interaction between cosmic rays and nit
 rogen or oxygen in \nthe atmosphere. The variation of its concentration in
 dicates the variation of \ncosmic-rays intensity. Cosmic rays which reach 
 the earth are modulated by the \nsolar activities in the heliosphere. It i
 s important to investigate the relationship \nbetween the concentrations o
 f Be-7 and the solar activities\, because of the \nestimation of the solar
  activities in past time using the cosmogenic nuclide with \nthe long half
 -life.\n We have been continuously observing the daily Be-7 concentration 
 in \nYamagata\, Japan (38.3°N\, 140.3°E) since 2000. Based on the 7-year
  \nobservation\, anti-correlations between the Be-7s and the sunspot numbe
 rs are \nobtained. The variation of Be-7 concentrations was 38 % during th
 e 7 years \nwhen the sunspot numbers changed 75 %. However\, as the behavi
 or is not so \nsimple\, we have analyzed the seasonal variations.\n Moreov
 er\, the Be-7 concentrations have been continuously observed in Iceland\n(
 64.7°N\, 21.2°W) since Sep.2003. This observation point is situated at h
 igh \nlatitude.\n We report the relationship between the variation of Be-7
  concentrations and \nsolar activities\, using the 7-year data set and the
  3-year dataset in Iceland.\n\nhttps://indico.nucleares.unam.mx/event/4/se
 ssion/80/contribution/556
LOCATION:Merida\, Mexico Yucatan I (Fiesta Americana)
URL:https://indico.nucleares.unam.mx/event/4/session/80/contribution/556
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