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   PR # 12021
    We propose to observe two nearby active flare stars (Prox Cen and UV
    Ceti) to detect the impulsive phase of one or more flares. Three
    impulsive phase signatures are potentially observable with Astro-D:
    Fe K-alpha fluorescence lines (6.40 keV) adjacent to the Fe XXIII-XXV
    complex (6.63-6.97 keV),spectral signatures of a superhot (conduction
    front) component, or a non-thermal continuum from particle beam
    bremsstrahlung.  We present arguments to show that one or more of
    these signatures will be observable if a small fraction of the total
    flare energy emerges in these mechanisms during the first few seconds
    of a flare. Coordinated ground-based observations will be scheduled
    around Astro-D as part of a MUSICOS flare-observer network campaign.

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