Variation of atmospheric depth profile on different time scales

Details Variation of atmospheric depth profile on different time scales Variation of atmospheric depth profile on different time scales

2006-03-03

arxiv.org/abs/astro-ph/0603088v1

Astropart.Phys. 25 (2006) 106-117

Astronomy and Astrophysics

Astrophysics

23 pages, including 15 figures and 2 tables

Scientific paper

10.1016/j.astropartphys.2005.12.

The vertical profile of atmospheric depth is an important element in extensive air shower studies. The depth of shower maximum is one of the most important characteristics of the shower. In the fluorescence technique of shower detection, the geometrical reconstruction provides the altitude of shower maximum, so that an accurate profile of atmospheric depth is needed to convert this altitude to the depth of shower maximum. In this paper the temporal variation of experimentally measured profiles of atmospheric depth at different sites is studied and implications for shower reconstruction are shown. The atmospheric profiles vary on time scales from hours to years. It is shown that the daily variation of the profile is as important as its seasonal variation and should be accounted for in air shower studies. For precise shower reconstruction, the daily profiles determined locally at the site of the air shower detector are recommended.

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