Positions of solar flares within a SPOT group.

The Relative Positions of Sunspots and Flares

This paper describes a study of 11 flaring sunspots, for which on flare days the relative positions of flares andsunspots have been determined from data provided by the Climax and the Mount Wilson Observatories. For eachspot group all data, including the magnetic polarities and field strengths, were projected to the center of the sun'sdisc and combined.The maps show that flaring...

Global Properties of Solar Flares

A solar tornado caused by flares

An enormous solar tornado was observed by SDO/AIA on 25 September 2011. It was mainly associated with a quiescent prominence with an overlying coronal cavity. We investigate the triggering mechanism of the solar tornado by using the data from two instruments: SDO/AIA and STEREO-A/EUVI, covering the Sun from two directions. The tornado appeared near to the active region NOAA 11303 that produced ...

Lithium-6 from Solar Flares

By introducing a hitherto ignored Li producing process, due to accelerated He reactions with He, we show that accelerated particle interactions in solar flares produce much more Li than Li. By normalizing our calculations to gamma-ray data we demonstrate that the Li produced in solar flares, combined with photospheric Li, can account for the recently determined solar wind lithium isotopic ratio...

7Li PRODUCTION IN SOLAR FLARES

The Y ohkoh satellite has registered X-ray spectra of two solar Ñares with a linelike feature in the region 400È500 keV. Analysis shows that this feature can be interpreted as gamma-ray lines from excited 7Li and 7Be produced from a ] a reactions. The 7Li production rate in the solar atmosphere is estimated from these observations. The lower limit on the Ñare-produced 7Li abundance on the Sun i...