Effect of an X-Class solar flare on the OI 630 nm dayglow emissions

Details Effect of an X-Class solar flare on the OI 630 nm dayglow emissions Effect of an X-Class solar flare on the OI 630 nm dayglow emissions

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11508302d&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A8, CiteID A08302

Physics

1

Atmospheric Composition And Structure: Thermosphere: Energy Deposition (3369), Atmospheric Composition And Structure: Airglow And Aurora, Space Weather: Solar Effects, Ionosphere: Ionization Processes (7823)

Scientific paper

We present a striking event that shows a prompt effect of an X-class solar flare (X6.2/3B) in the neutral optical dayglow emissions. This flare occurred on 13 December 2001 at 1424 UT and peaked at 1430 UT. The peak- to pre-flare X-ray intensity ratio as observed by GOES-10 was greater than 300 and the EUV flux observed by SEM/SOHO was greater by around 60%. As a response to this flare, the daytime redline (OI 630 nm) column integrated emission intensity measured from Carmen Alto (23.16°S, 70.66°W), in Chile, showed a prompt increase of around 50%. Our results show that this prompt enhancement in the thermospheric dayglow seems to be caused mainly due to an increase in photoelectrons due to a sudden increase in the solar EUV flux associated with this flare.

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