Mathematics – Probability
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.1002s&link_type=abstract
American Astronomical Society, DPS meeting #38, #10.02; Bulletin of the American Astronomical Society, Vol. 38, p.493
Mathematics
Probability
Scientific paper
Flares are sudden and unpredictable releases of energy that range from 1028 erg to 1037erg. All main sequence stars exhibit flare activity that differs in frequency and intensity from star to star. Flare activity is correlated with chromospheric and coronal activity, and is more frequent and intense in young and low-mass stars. We studied the effects of intense recurrent flaring on the photochemistry, climate, and biosignatures of planets with oxygen-rich atmospheres. A variety of synthetic time series' of fluxes consisting of a large number of flares was generated. Each time series consists of a very large number of flares whose properties are sampled from probability distributions derived for solar and stellar flares. We present results from the first step of the study which is to irradiate an Earth-like atmosphere with a single flare strong enough to disrupt the photochemistry. This allows us to learn which reactions limit the recovery to the former steady state, and how this recovery time depends on intensity, duration, and spectral distribution. The next step will use a series of flares that are exactly periodic, to find the time between flares below which return to steady state does not occur. This work will be followed by irradiation by a realistic synthetic times series of flares.
This material is based upon work supported by: the NASA UPN-RTOP-188-07-55-08 issued through the Terrestrial Planet Finder Foundation Science Program, the NASA Astrobiology Institute's Virtual Planetary Laboratory Lead Team, supported by the National Aeronautics and Space Administration through the NASA Astrobiology Institute under Cooperative Agreement Number CAN-00-OSS-01, the NASA Exobiology Grant No. NNG04GK43G, and the TPF/FS Grant No. NNG04GL49G with UC Berkeley.
Cohen Martin
Kasting James
Meadows Vikki
Scalo John
Segura Antigona
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