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BEGIN:VEVENT
DTSTAMP:20261031T225616Z
DTSTART;VALUE=DATE-TIME:20261026T140000
DTEND;VALUE=DATE-TIME:20261026T150000
SUMMARY:Bengt Elliasson (Strathclyde): Modelling of plasma waves in the i
 onosphere for the detection of space debris
TZID:Europe/London
UID:20261026-8ac672c5a15746b001a1683b53666c18@warwick.ac.uk
CREATED:20261023T100800Z
DESCRIPTION:Space debris is a present and growing hazard for satellite co
 mmunication and space exploration. There are efforts to find new ways of
  detecting space debris to avoid collisions with spacecraft at different
  altitudes\, to complement traditional methods such radars optical teles
 copes. In this talk we will present research on the detection of space d
 ebris and satellites in the ionosphere by studying different kinds of pl
 asma waves (whistlers\, lower hybrid and magnetosonic waves) that are em
 itted when the satellite propagates through the ionosphere and interacts
  with plasma irregularities. The Canadian Cassiope/e-POP satellite\, ope
 rated by University of Calgary\, sometimes observes enhanced wave activi
 ty in the 1-10 kHz range during conjunctions with another satellites or 
 space debris\, in the low earth orbit (LEO) 350-1000 km. There are also 
 natural whistler wave emissions due to lightning strikes and man-made tr
 ansmissions by VLF stations for submarine communication\, which are easy
  to identify. We will show modelling results\, including space craft cha
 rging\, and simulations of wave excitation by the charged satellite as i
 t propagates through space\, and how these waves can be detected and int
 erpreted based on their frequency and polarization.
LOCATION:A1.25 (Millburn)
URL:
ATTACH:
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20261023T100800Z
ORGANIZER;CN=Dmitrii Kolotkov:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261031T225616Z
DTSTART;VALUE=DATE-TIME:20261027T140000
DTEND;VALUE=DATE-TIME:20261027T150000
SUMMARY:Junho Park (Coventry): Waves and instability-driven turbulence in
  rotating stars and their evolution
TZID:Europe/London
UID:20261027-8ac672c6a0e5f88201a0f6ae5c0e489d@warwick.ac.uk
CREATED:20261001T085657Z
DESCRIPTION:Angular momentum transport is a fundamental process governing
  the structure and evolution of stars. Understanding the physical mechan
 isms that re-distribute the angular momentum within stellar interiors re
 mains one of the main challenges in astrophysics. In radiation zones in 
 which a fluid is considered to be stably stratified\, candidate mechanis
 ms for the angular momentum transport include gravito-inertial waves and
  shear-driven turbulence. In the seminar\, I will talk about some fundam
 ental fluid dynamics of waves and shear instabilities in stellar radiati
 on zones\, which are stratified and (differentially) rotating. I will di
 scuss about how horizontal and vertical shear flows could lead to turbul
 ence via various instability mechanisms [1\,2]\, what the roles of waves
  and instabilities are in dissipation and transport of turbulence [2-4]\
 , and how these waves and instabilities could impact stellar evolution p
 rocesses. References [1] Park\, Prat\, et al.\, A&A\, 646\, A64 (2021) [
 2] Park\, Mathis\, MNRAS\, 540\, 298 (2025) [3] Dandoy\, Park\, et al.\,
  A&A\, 673\, A6 (2023) [4] Moisset\, Billant\, et al.\, JFM\, 1027\, A28
  (2026)
LOCATION:F25A (Millburn)
URL:
ATTACH:
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20261001T085657Z
ORGANIZER;CN=Dmitrii Kolotkov:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261031T225616Z
DTSTART;VALUE=DATE-TIME:20261020T140000
DTEND;VALUE=DATE-TIME:20261020T150000
SUMMARY:Welcome to CFSA event
TZID:Europe/London
UID:20261020-8ac672c6a13e96c401a13ecebd1e00c1@warwick.ac.uk
CREATED:20261015T090458Z
DESCRIPTION:
LOCATION:A128 (Millburn)
URL:
ATTACH:
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20261015T090458Z
ORGANIZER;CN=Dmitrii Kolotkov:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261031T225616Z
DTSTART;VALUE=DATE-TIME:20261103T150000
DTEND;VALUE=DATE-TIME:20261103T160000
SUMMARY:Daye Lim (Exeter): "From EUV Brightenings to Stellar Flares: Univ
 ersal Scaling of Quasi-Periodic Pulsations"
TZID:Europe/London
UID:20261103-8ac672c7a13e96e801a13ecc6419032a@warwick.ac.uk
CREATED:20261015T090224Z
DESCRIPTION:Small-scale extreme-ultraviolet (EUV) brightenings are ubiqui
 tous in the solar corona and may represent the low-energy counterparts o
 f larger solar flares\, with important implications for coronal heating.
  A key observational signature of solar and stellar flares is the presen
 ce of quasi-periodic pulsations (QPPs)\, which are thought to reflect fu
 ndamental processes of impulsive energy release. QPPs can therefore prov
 ide a useful diagnostic for determining whether EUV brightenings share t
 he same underlying mechanisms as larger-scale flares or instead represen
 t a fundamentally distinct regime. In this talk\, I will present observa
 tions from the high spatial and temporal resolution of the Solar Orbiter
 /Extreme Ultraviolet Imager\, showing clear evidence that QPPs are prese
 nt in EUV brightenings. I will characterise their properties over a wide
  range of spatial and temporal scales and show that their periods extend
  from a few seconds to several minutes\, comparable to those observed in
  larger flares. I will also discuss the relationship between QPP damping
  time and period\, which follows a common power-law scaling for both EUV
  brightenings and EUV solar flares. When combined with previously report
 ed X-ray QPPs from solar and stellar flares\, these events align with a 
 single scaling trend spanning many orders of magnitude in scale. This ap
 parent universality suggests that QPPs in small-scale brightenings\, sol
 ar flares\, and stellar flares may be governed by a broadly common under
 lying physical mechanism.
LOCATION:F25A (Millburn)
URL:
ATTACH:
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20261015T090224Z
ORGANIZER;CN=Dmitrii Kolotkov:
END:VEVENT
END:VCALENDAR