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• W3100179624 abstract "Despite being the most prominent emission line in the solar spectrum, there has been a notable lack of studies devoted to variations in Ly$alpha$ emission during solar flares in recent years. However, the few examples that do exist have shown Ly$alpha$ emission to be a substantial radiator of the total energy budget of solar flares (on the order of 10%). It is also a known driver of fluctuations in earth's ionosphere. The EUV Variability Experiment (EVE) onboard the Solar Dynamics Observatory now provides broadband, photometric Ly$alpha$ data at 10 s cadence with its Multiple EUV Grating Spectrograph-Photometer (MEGS-P) component, and has observed scores of solar flares in the 5 years since it was launched. However, the MEGS-P time profiles appear to display a rise time of tens of minutes around the time of the flare onset. This is in stark contrast to the rapid, impulsive increase observed in other intrinsically chromospheric features (H$alpha$, Ly$beta$, LyC, C III, etc.). Furthermore, the emission detected by MEGS-P peaks around the time of the peak of thermal soft X-ray emission, rather than during the impulsive phase when energy deposition in the chromosphere - often assumed to be in the form of nonthermal electrons - is greatest. Given that spectrally-resolved Ly$alpha$ observations during flares from SORCE/SOLSTICE peak during the impulsive phase as expected, this suggests that the atypical behaviour of MEGS-P data is a manifestation of the broadband nature of the observations. This could imply that other lines and/or continuum emission that becomes enhanced during flares could be contributing to the passband. Users are hereby urged to exercise caution when interpreting broadband Ly$alpha$ observations of solar flares. Comparisons have also been made with other broadband Ly$alpha$ photometers such as PROBA2/LYRA and GOES/EUVS-E." @default.
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• W3100179624 date "2016-02-29" @default.
• W3100179624 modified "2023-09-30" @default.
• W3100179624 title "Anomalous temporal behaviour of broadband Ly<i>α</i>observations during solar flares from SDO/EVE" @default.
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• W3100179624 doi "https://doi.org/10.1051/0004-6361/201526682" @default.
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