16 research outputs found
High-Energy Aspects of Solar Flares: Overview of the Volume
In this introductory chapter, we provide a brief summary of the successes and
remaining challenges in understanding the solar flare phenomenon and its
attendant implications for particle acceleration mechanisms in astrophysical
plasmas. We also provide a brief overview of the contents of the other chapters
in this volume, with particular reference to the well-observed flare of 2002
July 23Comment: This is the introductory article for a monograph on the physics of
solar flares, inspired by RHESSI observations. The individual articles are to
appear in Space Science Reviews (2011
Extreme Ultra-Violet Spectroscopy of the Lower Solar Atmosphere During Solar Flares
The extreme ultraviolet portion of the solar spectrum contains a wealth of
diagnostic tools for probing the lower solar atmosphere in response to an
injection of energy, particularly during the impulsive phase of solar flares.
These include temperature and density sensitive line ratios, Doppler shifted
emission lines and nonthermal broadening, abundance measurements, differential
emission measure profiles, and continuum temperatures and energetics, among
others. In this paper I shall review some of the advances made in recent years
using these techniques, focusing primarily on studies that have utilized data
from Hinode/EIS and SDO/EVE, while also providing some historical background
and a summary of future spectroscopic instrumentation.Comment: 34 pages, 8 figures. Submitted to Solar Physics as part of the
Topical Issue on Solar and Stellar Flare
Le magmatisme de la région de Kwyjibo, Province\ud du Grenville (Canada) : intérêt pour les\ud minéralisations de type fer-oxydes associées
The granitic plutons located north of the Kwyjibo property in Quebec’s Grenville Province are of\ud
Mesoproterozoic age and belong to the granitic Canatiche Complex . The rocks in these plutons are calc-alkalic, K-rich,\ud
and meta- to peraluminous. They belong to the magnetite series and their trace element characteristics link them to\ud
intraplate granites. They were emplaced in an anorogenic, subvolcanic environment, but they subsequently underwent\ud
significant ductile deformation. The magnetite, copper, and fluorite showings on the Kwyjibo property are polyphased\ud
and premetamorphic; their formation began with the emplacement of hydraulic, magnetite-bearing breccias, followed by\ud
impregnations and veins of chalcopyrite, pyrite, and fluorite, and ended with a late phase of mineralization, during\ud
which uraninite, rare earths, and hematite were emplaced along brittle structures. The plutons belong to two families:\ud
biotite-amphibole granites and leucogranites. The biotite-amphibole granites are rich in iron and represent a potential\ud
heat and metal source for the first, iron oxide phase of mineralization. The leucogranites show a primary enrichment in\ud
REE (rare-earth elements), F, and U, carried mainly in Y-, U-, and REE-bearing niobotitanates. They are metamict and\ud
underwent a postmagmatic alteration that remobilized the uranium and the rare earths. The leucogranites could also be\ud
a source of rare earths and uranium for the latest mineralizing events