[Astronomy seminar] Astronomy departmental seminar Friday, May 17 at 10:30am - Elena Khomenko (Instituto de Astrofisica de Canarias)

[Astronomy seminar announcements]

Dear all,

This week we will a second SU astronomy departmental seminar that will 
take place on Friday, May 17 at 10:30am in room FC61 (AlbaNova building, 
6th floor) and on zoom 
(https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09).
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Speaker: Elena Khomenko (Instituto de Astrofisica de Canarias)
Title: Latest updates on PI2FA project: modeling ion-neutral effects in 
the solar chromosphere
Event: https://indico.fysik.su.se/e/elena_khomenko

Abstract:
The PI2FA project focused on creating and applying tools for 
multi-dimensional modeling of partially ionized chromospheric plasma 
based on the single-fluid and two-fluid multi-species formalism. 
Scientific questions include clarifying chromospheric heating 
mechanisms, creating multi-dimensional realistic models of the solar 
chromosphere incorporating ion-neutral effects, and understanding 
neutrals' role in prominence dynamics. The research focused on 
fundamental mechanisms of energy propagation and exchange in complex 
plasmas, such as waves, instabilities, and plasma-radiation 
interactions, seeking the transition from one-dimensional idealized 
models to multi-dimensional simulations, and observational support. 
Among the main conclusions, our research unveiled that multi-fluid 
effects become pronounced for waves with frequencies lower than typical 
inter-particle collisional frequencies, unlike suggested by theory of 
waves in homogeneous plasmas; we showed that ambipolar heating is most 
significant in the quietest regions, characterized by small-scale dynamo 
fields; we found that multi-fluid effects hold great importance within 
transition layers between cool and hot materials, such as the solar 
transition region and prominence-corona interface. Multi-fluid effects 
operate at scales beyond the resolution capabilities of even our most 
advanced instrumentation, necessitating specialized observational 
initiatives. Our initial steps in this direction allowed the detection 
of subtle differences in velocities between ions and neutrals, in line 
with theoretical predictions.
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We look forward to seeing many of you there. Thanks!

Adur and Adélaïde

Upcoming Events:

2024-05-24 Matteo Messa
2024-05-31 Oleg Kochukhov (**Last seminar before summer break**)
2024-06-07 **No seminar** (Klämdag)
2024-06-14 **No seminar** (PhD defense: Ivelin Georgiev)
2024-06-21 **No seminar** (Midsummer)

You can subscribe to the seminars calendar in:
https://ttt.astro.su.se/ical/astro-seminars.ics
(Please note that calendar can be subject to updates)
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Join Zoom Meeting:
https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09
Meeting ID: 622 1126 9644