Latitude survey in December 1996 March 1997, 1. cut-off rigidities for different azimuth and zenith angles

Details Latitude survey in December 1996 March 1997, 1. cut-off rigidities for different azimuth and zenith angles Latitude survey in December 1996 March 1997, 1. cut-off rigidities for different azimuth and zenith angles

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.4039d&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

Vertical and non vertical effective cutoff rigidities have been calculated by tracing particle trajectories through the summarized magnetic field of the InternationalGeomagnetic Reference Field model (IGRF95, IAGA Division 5 Working Group 8, 1996) and the Tsyganenko (1989) magnetosphere model. The computation was done or every day of the Italian Antarctic expedition 1996-1997 for zenith angles 0, 15, 30, and 60 degrees, and azimuth angles from 0 to 360 degrees with 45 degrees step for geographic points corresponding to the daily average coordinates of the expedition ship.Secular variation of the main geomagnetic field was taken into account by extrapolating IGRF95 to the time of cosmic ray intensity measurements. The Tsyganenko (1989) model takes into account the contribution from the magnetosphere current systems inside the magnetosphere as well as in the magnetosphere tail and in the magnetopause. This model allows to take into consideration seasonal and diurnal changes of the magnetospheric field and also geomagnetic activity level Kp. Calculations were done for the time of measurements for a quiet geomagnetic field condition Kp=0. The effective cutoff rigidity is defined by taking into account penumbra and coupling functions according to Dorman et al. (1972). For every dayof the expedition we evaluate the diurnal changes of vertical upper cutoff rigidities Ruv . The Ruv diurnal variation amplitudes are not more than 0.1 GV at geographical latitudes from 40 N to 40 S and 0.15 GV at latitudes (40-53) S. It was found that Ruv value at 12 LT is about equal to the daily average Ruv for every point. Taking to be so for inclined particles we calculate Reff for 12 LT considering it as daily mean value.

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