High energetic solar proton flares at 26 and 28 October 2003

During the period from 19 October to 4 November 2003, there are a sudden and high activity for the sun, where the sunspot area increased from 1110 10E-6 Hemisphere at 19 October to 5690 10E-6 Hemisphere at 30 October, then decreased to 1110 10 E-6 Hemisphere at 4 November 2003. Also, the radio flux on 10.7 cm increased from 120 sfu at 19 October to 298 sfu at 26 October, then decrease to 168 sfu at 4 November 2003. There are two eruptive solar proton flares released at 26 and 28 October 2003, where the last one is the most eruptive flare recorded since 1976 with importance X17/4B. The proton event affecting the earth environment with energy >10 MeV is 29.500 particle flux units at 29 October 2003 as recorded by spacecraft SOHO, due to the solar flares of 28 October. The coronal mass ejection which reach to the top of the earth's atmosphere from the mid of 29 to the mid of 31 October 2003 recorded high velocity of 950 km/sec. The peak of the solar cycle 21 was at 1979 but high energetic solar flares occurred at the declining phase at 1981, 1982, and 1984 before the solar activity minimum at 1986. Also, the peak of the solar cycle 22 was at 1989 but high energetic solar flares occurred at the declining phase at 1991, 1992, and 1994 before the solar activity minimum at 1996. The peak of the solar cycle 23 was at 2001. The secondary peak is 2 to 3 years after the first peak, as deduced from the last five solar cycles. We conclude the period of 19 October to 4 November 2003 is the second peak of the solar cycle 23. There are many terrestrial influences, due to the solar activity during October - November 2003. These influences are studded in details, specially the geomagnetic storms and their effects on humankind daily activity.