Solar particle composition measurements

The composition of solar particle events, that is the relative abundance of different elements, was studied, using nuclear emulsion detectors flown on board sounding rockets. These observations were extended to elements as heavy as iron. A model is discussed in which the particles in a flare are stripped of electrons in the high temperature of a flare region, and subsequently are accelerated presumably by magnetic fields

Enhancement of solar heavy nuclei at high energies in the 4 July 1974 event

Relative abundances of energetic nuclei in the 4 July 1974 solar event are presented. The results show a marked enhancement of abundances that systematically increase with nuclear charge numbers in the range of the observation, 6 less than or equal to Z less than or equal to 26 for energies above 15 MeV/nucleon. While such enhancements are commonly seen below 10 MeV/nucleon, most observations at higher energies are found to be consistent with solar system abundances. The energy spectrum of oxygen is observed to be significantly steeper than most other solar events studied in this energy region. It is proposed that these observations are characteristic of particle populations at energies approximately 1 MeV/nucleon, and that the anomalous features observed here may be the result of the high energy extension of such a population that is commonly masked by other processes or populations that might occur in larger solar events

Book Review: \u3ci\u3eEmpire of Ashes\u3c/i\u3e

Three historical novels about Alexander the Great were published in 2004 to coincide with the November release of Oliver Stone’s epic film on the conqueror: The Virtues of War by Steven Pressfield, who is best known for Gates of Fire (1998) about the Battle of Thermopylae; Queen of the Amazons by Judith Tarr, who wrote about Alexander once before in Lord of the Two Lands (1993); and Empire of Ashes by relative newcomer Nicholas Nicastro