Stellar Activity Characteristics at FUV and Radio Wavelengths

Details Stellar Activity Characteristics at FUV and Radio Wavelengths Stellar Activity Characteristics at FUV and Radio Wavelengths

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..430..483l&link_type=abstract

Pathways Towards Habitable Planets, proceedings of a workshop held 14 to 18 September 2009 in Barcelona, Spain. Edited by Vincen

Mathematics

Probability

Scientific paper

Since stellar activity can affect atmospheres of close-in habitable exoplanets, knowledge of a star’s activity level is crucial. Different wavelength ranges yield different possibilities on investigating stellar activity phenomena such as flares and coronal mass ejections (CMEs). In this context we present two approaches to this topic using observations from the far-ultraviolet (FUV) and radio domains. The FUV provides density sensitive line ratios, which show enhancements during stellar flaring. The question if these could be correlated to mass expulsions is investigated by analyzing time series of solar UV full-disk measurements using data from the SORCE and TIMED missions. The second approach is dedicated to the decameter wavelength domain, where we use the known correlation between radio decameter type II bursts and CMEs on the Sun. We present the detection of promising events on the active M-dwarf AD Leo which have a high probability of being of stellar origin. These bursts have parameters similar to solar decameter type III bursts which are fast drifting bursts usually correlated with flares on the Sun. Both approaches are discussed and results are presented.

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