The AD775 Cosmic Event Revisited: The Sun is to Blame

Ludlow, Francis

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Journal Article

Date:

2013

Author:

Ludlow, Francis

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Usoskin, I. G., Kromer, B., Ludlow, F., Beer, J., Friedrich, M., Kovaltsov, G. A., Solanki, S. K. and Wacker, L., The AD775 Cosmic Event Revisited: The Sun is to Blame, Astronomy & Astrophysics, 553, 2013

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Miyake et al. (2012, Nature, 486, 240, henceforth M12) recently reported, based on 14C data, an extreme cosmic event in about AD775. Using a simple model, M12 claimed that the event was too strong to be caused by a solar flare within the standard theory. This implied a new paradigm of either an impossibly strong solar flare or a very strong cosmic ray event of unknown origin that occurred around AD775. However, as we show, the strength of the event was significantly overestimated by M12. Several subsequent works have attempted to find a possible exotic source for such an event, including a giant cometary impact upon the Sun or a gamma-ray burst, but they are all based on incorrect estimates by M12. We revisit this event with analysis of new datasets and consistent theoretical modelling.

Author: Ludlow, Francis

Type of material:

Journal Article

URI:

http://hdl.handle.net/2262/79669

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Astronomy & Astrophysics
553

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Subject (TCD):

Making Ireland , Smart & Sustainable Planet , Telecommunications , Annals , Auroras , Chronicles , Early Medieval History , Irish History , MEDIEVAL , Medieval Sources , SOLAR ENERGY , Solar , Solar Astronomy , Solar Cycle , Solar Phenomena , Solar Physics , Solar Physics , Solar flare , medieval astronomy

DOI:

http://dx.doi.org/10.1051/0004-6361/201321080

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