3-11 July 2007
Merida, Mexico
Mexico/General timezone
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SH 3.6

Place

Location: Merida, Mexico
Room: Yucatan I (Fiesta Americana)
Date: 7 Jul 10:30 - 11:55

Conveners

    • Dr. Usoskin, Ilya (University of Oulu, Finland)

Timetable | Contribution List

Displaying 7 contributions out of 7
Type: Oral Session: SH 3.6
Track: SH.3.6
The increasing number of reports on the gamma-ray detection from thunder clouds and lightenings indicate that charged particles are accelerated by the strong electric fields associated with the thunder phenomena. In order to search for high-energy radiation from winter thunder clouds in the Japan sea coast areas, we have set up an autonomous radiation detection system at Kashiwasaki, Niigata p ... More
Presented by Mr. Teruaki ENOTO on 7/7/2007 at 15:42
Type: Oral Session: SH 3.6
Track: SH.3.6
Cosmogenic radionuclides can be considered as surrogates for a neutron monitor because they are produced mainly by the interaction of cosmic ray neutrons with nitrogen and oxygen in the atmosphere. Measured in natural archives such as ice cores (10Be) and tree rings (14C) they record the cosmic ray intensity. Compared to manmade neutron monitors their time resolution is low (years) and their ... More
Presented by Prof. Juerg BEER on 7/7/2007 at 16:42
Type: Oral Session: SH 3.6
Track: SH.3.6
A direct comparison of impulsive nitrate enhancements observed in multiple polar ice cores from both hemispheres is presented for the years 1940-1950. During that time period, four ground-level solar cosmic ray events (GLEs) were recorded by ionization chambers. We show that large and sudden enhancements in the nitrate records from both hemispheres were observed within weeks of the dat ... More
Presented by Dr. Don SMART on 7/7/2007 at 15:30
Type: Oral Session: SH 3.6
Track: SH.3.6
Baksan Neutrino Observatory results on variations of thermal neutron flux near the ground surface measured with an open scintillator detector are presented. Experimental evidences were obtained of correlation between the long-term thermal neutron flux variations and the lunar periods (Radon-neutron tidal waves).
Presented by Dr. Victor ALEKSEENKO on 7/7/2007 at 16:30
Type: Oral Session: SH 3.6
Track: SH.3.6
Using nitrate enhancements in the polar ice as a proxy for solar proton events, we have determined the proton fluence above 30 MeV for 31 solar cycles between 1610 and 1954 (cycle -12 through cycle 18). Our results show a wide range of solar proton fluences over these 31 solar cycles, from three cycles with no significant proton events above 10**9 protons/cm to a high of 38 x 10**9 prot ... More
Presented by Dr. Margaret SHEA on 7/7/2007 at 16:06
Type: Oral Session: SH 3.6
Track: SH.3.6
At the previous ICRC, Kruger et al. 2005, Proc. 29th ICRC, Pune, 2, 473, and 2, 477, reported on the first tests of two newly constructed calibration neutron monitors. These monitors are designed to provide an intercalibration between the 50- odd neutron monitors around the world, so that rigidity spectra can be calculated from them. In those papers we described the difference in the latitu ... More
Presented by Prof. Harm MORAAL on 7/7/2007 at 16:18
Type: Oral Session: SH 3.6
Track: SH.3.6
C-14 concentrations of single-yr tree rings indicate solar modulations of cosmic rays such as 11-yr solar cycle. Old tree rings are a powerful tool to detect the variations of cosmic-rays in past time. From C-14 dating, the calendar age of the Choukai Jindai cedar in Japan (39°N) was ranged in from 2757 to 2437 cal BP with 320 tree rings. According to IntCal04 which is the standard inte ... More
Presented by Ms. Yui TAKAHASHI on 7/7/2007 at 15:54
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