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BEGIN:VEVENT
DTSTAMP:20260428T221316Z
DTSTART;VALUE=DATE-TIME:20201116T130000
DTEND;VALUE=DATE-TIME:20201116T140000
SUMMARY:Laura Hayes (NASA): Solar Flares\, Quasi-Periodic Pulsations and 
 the Earth’s Ionosphere
TZID:Europe/London
UID:20201116-8a17841a7520fdba01752cbdd87854c7@warwick.ac.uk
CREATED:20201112T093458Z
DESCRIPTION:Solar flares are the most powerful and energetic physical phe
 nomena in our solar system\, releasing radiation across the whole electr
 omagnetic spectrum with total energies reaching on the order of 1025 J i
 n a matter of minutes. On Earth\, the conditions of the terrestrial iono
 sphere is significantly affected by solar flaring energy release. Enhanc
 ed X-ray and EUV emission drives a rapid increase of ionization on the e
 ntire dayside ionosphere resulting in substantial electron density incre
 ases in the lower ionosphere to extents large enough to effect the propa
 gation of radio waves used in telecommunications. In this way we want to
  study solar flares to understand their driving mechanisms\, emission sp
 ectra\, and underlying physics to build towards a greater understanding 
 of why\, how\, and when they occur. A key observational feature of the e
 mission generated in solar flares is the presence of quasi-periodic puls
 ations (QPPs). The occurrence of such pulsations in flaring emission pla
 ces additional constraints on the interpretation and processes that oper
 ate in solar flares\, and hence a full description of the phenomena is r
 equired to build towards an integrated solar flare model. In this semina
 r I will present an overview of quasi-periodic pulsations that exists in
  solar flare emission\, including their geophysical impacts on the Earth
 ’s ionosphere\, and discuss a recent statistical study of quasi-periodic
  pulsations observed in the X-ray emission from flares over the last sol
 ar cycle\, placing the results in the context of proposed mechanisms.
LOCATION:
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20201112T093458Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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