scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
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STP12 Abstracts<br />
Berlin, 12 - 16 July <strong>2010</strong><br />
SCOSTEP Symposium <strong>2010</strong><br />
Contributions of Brazili<strong>an</strong> Decimetric Array (BDA) for Chromospheric Evaporation<br />
<strong>an</strong>d Plasmoid Ejection Investigations<br />
Fern<strong>an</strong>des Fr<strong>an</strong>cisco<br />
IP&D - UNIVAP<br />
The basic scenario of chromospheric evaporation is based consi<strong>der</strong>ing the particles<br />
accelerated during solar flares in the corona c<strong>an</strong> be confined <strong>an</strong>d move down along the<br />
magnetic lines. They c<strong>an</strong> lose their energy by collisions with denser plasma at low<br />
chromosphere. Then, the heated plasma exp<strong>an</strong>ds rapidly, but as it is confined by the magnetic<br />
loop structure, it c<strong>an</strong> only flows upward. The up-flow of the hot plasma is known as<br />
chromospheric evaporation. The up-flowing plasma c<strong>an</strong> be inferred in radio frequencies by<br />
the occurrence of the slowly drifting fine structures recorded in radio wavelengths, generated<br />
by electron beams traveling along to magnetic loop <strong>an</strong>d crossing up-going evaporation front.<br />
With the high spectral/temporal resolution Brazili<strong>an</strong> Solar Spectrsocope (BSS), operating in<br />
the frequency r<strong>an</strong>ge of 1.0 – 2.5 GHz, we have recorded decimetric fine structures with highfrequency<br />
edge slowly drifting from high to low frequencies, associated with eight solar<br />
flares. In this work we present details of these fine structures <strong>an</strong>d their interpretation in terms<br />
of the plasma emission produced by accelerated particles <strong>an</strong>d the chromospheric evaporation<br />
front. We discuss that the diagnostic <strong>an</strong>d investigation of the chomospheric evaporation <strong>an</strong>d<br />
also, of the plasmoids ejection <strong>an</strong>d displacement in the solar atmosphere c<strong>an</strong> be<br />
complemented, using high spatial solar radio images, as that will be provided by the Brazili<strong>an</strong><br />
Decimetric Array (BDA), in the decimetric frequency r<strong>an</strong>ge (1.2,-1.7, 2.8, 5.6 GHz). We also<br />
present the current status of the development of the BDA, <strong>an</strong>d it potential contributions to<br />
space weather science <strong>an</strong>d to investigations of solar flares <strong>an</strong>d CMEs, related to location of<br />
energy release <strong>an</strong>d particle acceleration regions <strong>an</strong>d tr<strong>an</strong>sport of energetic particles.
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