Sun's shadow in a high state of solar activity detected with the Tibet air shower array

Details Sun's shadow in a high state of solar activity detected with the Tibet air shower array Sun's shadow in a high state of solar activity detected with the Tibet air shower array

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3795a&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

A yearly variation of the Sun's shadow was examined in the period from 1990 to 2001 using the data obtained with the Tibet air-shower array. In the quiet phase between 1996 and 1997, the Sun's shadow was observed just at the apparent position of the Sun with a high significance level, while in the active phase from 1998 to 2001, the shadow became complicated and gradually disappeared year by year. The Sun's shadow is very sharp in the quiet phase, but the form of a shadow is not clear anymore in the low energy region. We present a preliminary result on the Sun' shadow observed in 2000 2001 and compare it with the past data.

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