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ESPOS videos
European Solar Physics Online Seminars
Position
https://espos.stream
Department
Field of research
Natural Sciences (Astrophysics and Astrononmy)
Email
shahin.jafarzadeh@astro.uio.no
My OpenAccess portfolio
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Partially ionised mixing with collisional and radiative ionisation and recombination | Ben Snow
Natural Sciences (Astrophysics and Astrononmy)
55 views
Date of upload:
16.05.2024
Co-author:
Caption:
Turbulence is a fundamental process that drives mixing and energy redistribution across a wide range of astrophysical systems. For warm (T ≈ 10^4K) plasma, the material is partially-ionised, consisting of both ionised and neutral species. The interactions between ionised and neutral species are thought to play a key role in heating (or cooling) of partially-ionised plasmas. Here mixing is studied in a two-fluid partially-ionised plasma undergoing the shear-driven Kelvin-Helmholtz instability to evaluate the thermal processes within the mixing layer. 2D numerical simulations are performed using the open-source (PIP) code that solves for a two-fluid plasma consisting of a charge-neutral plasma and multiple excited states of neutral hydrogen. Read more at https://espos.stream/2024/05/16/Snow/
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An overview of last October's SST-SolO observational campaign | Sanja Danilovic
Natural Sciences (Astrophysics and Astrononmy)
48 views
Date of upload:
21.05.2024
Co-author:
Caption:
We present the results of coordinated observations of the Swedish 1-m Solar Telescope with Solar Orbiter that took place from October 12th to 26th 2023. The campaign resulted in 7 datasets of various quality. The observational programs were adjusted to the seeing conditions. The observations cover two active regions and a coronal hole. We focus on the morphology and evolution of several targets that are observed from two vantage points. We share the lessons we learned and give an outline of our plans for October this year and the support we could give during remote sensing windows 16 and 17.
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Detection and in-depth analyses of quiet-Sun IRIS Bright Points | Llŷr Dafydd Humphries
Natural Sciences (Astrophysics and Astrononmy)
63 views
Date of upload:
31.05.2024
Co-author:
Caption:
Observations of small-scale brightenings in the low solar atmosphere can provide valuable constraints on possible heating and heat transport mechanisms. We present a method for the detection and analysis of bright points (BPs), and demonstrate its application to time-series imagery of the Interface Region Imaging Spectrograph (IRIS) in the extreme ultraviolet. The method is based on spatio-temporal band-pass filtering, adaptive thresholding and centroid tracking, and records an event’s spatial position, duration, speed, total brightness, maximum brightness, and intrinsic brightness. Spatial area, brightness, and position are also recorded as functions of time throughout the event’s lifetime. Read more at https://espos.stream/2024/05/30/Humphries/.
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Automatic Identification and Tracking of Sunspots | Charlotte Proverbs
Natural Sciences (Astrophysics and Astrononmy)
42 views
Date of upload:
14.06.2024
Co-author:
Caption:
It is well understood that the dynamics of sunspots lead to energy being transferred to the solar atmosphere and stored in the coronal magnetic field. This provides a surplus of energy that may be released in solar eruptions. The driving mechanisms for this energy transfer may include sunspot rotations, both within individual sunspots and between sunspot pairs. Calculation of the rotations of individual sunspots have been carried out by several authors, but studies of the rotation of sunspot pairs has been less systematically investigated. Read more at https://espos.stream/2024/06/13/Proverbs/.

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