CEDAR email: [Announcement ISWI Seminar] “ New dynamics of ionospheric electron temperature overshoot uncovered by neural networks” by Dr. Artem Smirnov

[Maria Graciela Molina]

Dear colleagues,


We are pleased to announce the next ISWI Webinar of 2026 by Dr Artem Smirnov
scheduled for March 25th, 2026 at 3 PM Central European Time (9 AM EDT;
7:30 PM IST).


To attend the next Webinar, please register here
<https://iswi-secretariat.org/home-page/meetings/iswi-webinars/iswi-webinar-registration/>.
The MS Teams link will be sent to registered participants 2 days before the
event.

To watch past Webinars, please check the following link:
 https://cdaw.gsfc.nasa.gov/webinars/ISWI/
<https://cdaw.gsfc.nasa.gov/webinars/ISWI/>


With kind regards,

Graciela Molina

on behalf of the ISWI Seminar Committee

https://iswi-secretariat.org/home-page/organization/iswi-webinar-committee/





***********************************************
*Title*: *New dynamics of ionospheric electron temperature overshoot
uncovered by neural networks*
*Speaker*: *Dr. Artem Smirnov*
Helmholtz Centre Potsdam -
GFZ German Research Centre for Geosciences

*Abstract:* An intense surge in equatorial electron temperature (Te) at
sunrise, known as the morning Te overshoot, has been one of the most widely
studied ionospheric features since its discovery in the early Space Age.
Despite extensive research, its behavior during geomagnetic storms remains
poorly understood. Using global electron temperature observations by the
CHAllenging Minisatellite Payload (CHAMP) mission in 2002-2010, we develop
a global neural network Te model that shows excellent performance on
independent data, including those from the incoherent scatter radars
(ISRs). The model revealed an unexpected two-phase stormtime response of
the morning Te overshoot. During the storm’s main phase, electron
temperatures in the overshoot region exhibit a pronounced enhancement,
followed by a dramatic depletion exceeding 1000 K and disappearance of the
overshoot during the recovery phase. This evolution corresponds to the
initial influence of a westward prompt penetration electric field (PPEF),
which reduces electron densities, allowing for more efficient energy
exchange between newly ionized sunrise particles and the lower-energy
(depleted) ambient plasma. Later in the storm, the eastward disturbance
dynamo field flips the ExB drift from downward to upward and lifts more
electrons into the F-region. The resulting increase in electron density
enhances cooling rates, leading to the overshoot's disappearance in the
recovery phase. Our findings shed new light on the dynamics of the morning
electron temperature overshoot and highlight the capability of
new-generation NN models of the near-Earth space environment to uncover
previously unrecognized physical patterns even for the most commonly
studied phenomena.


[image: ISWI Seminar Series.png]








-------------------------------------------
*Dra. María Graciela Molina*
Prof. Asociada FACET-UNT / Associate Professor FACET -UNT
Inv. Adjunta CONICET / Researcher CONICET
Investigadora Asociada INGV/ Associated researcher INGV
President of ALAGE (https://alage.org/)
Co-leader  FA3 - COURSE/SCOSTEP (https://scostep.org/scostep-course/)
Chair ISWI Webinars (https://iswi-secretariat.org/)

Av. Independencia 1800, Tucumán - Argentina
Tel: +54-381-4364093 (ext.7765)
gmolina at herrera.unt.edu.ar /
*m.graciela.molina at gmail.com* <m.graciela.molina at gmail.com>
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