Nikola Vitas

Showing posts with label chromosphere. Show all posts

Monday, 3 October 2022

Robert Jelle Rutten (1942 - 2022)

So long, my teacher and friend. You will be hugely missed.

Posted by Nikola Vitas at 05:01

Labels: astronomy, chromosphere, DOT, radiative transfer, solar atmosphere, stellar atmospheres, sun, teaching, utrecht

Location: Santa Cruz de Tenerife, Spain

Wednesday, 17 October 2018

Three-dimensional simulations of solar magneto-convection including effects of partial ionization

Astronomy & Astrophysics Volume 618 (October 2018) is just out with a figure from our paper on the cover!

The paper (Khomenko, Vitas, Collados & de Vicente 2018: A&A, ADS) describes the effects of the partial ionization on the structure, dynamics and energy balance of the low chromosphere.

Posted by Nikola Vitas at 14:29 No comments:

Labels: astronomy, chromosphere, magnetic fields, MANCHA, MHD, papers, partial ionization, solar atmosphere

Location: Santa Cruz de Tenerife, Spain

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GitHub

In October 2017 all my IDL routines are moved from DropBox to GitHub repository:
https://github.com/nikolavitas

About Me

Nikola Vitas: I am a astrophysicist at Instituto de Astrofisica de Canarias (Tenerife, Spain). My main research interest is the physics of cool atmospheres (the Sun, cool stars, brown dwarfs and substellar objects, planets and the Earth)

View my complete profile

Contact

nikola.vitas.iac@gmail.com

(Please DO NOT use my iac.es address as the emails send to it often get lost.)

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Labels

abundances astronomy atomic physics cartoons chromosphere data data mining DOT EOS hermite IAC IDL integration interpolation Kubuntu lambda operator LaTeX links linux MacBook magnetic fields MANCHA MHD MURaM numerics observatory one-dimensional models opacities papers partial ionization phd philosophy radiative transfer science+art science+history science+politics smoothing solar atmosphere space spectropolarimetry spinoza splines statistics stellar atmospheres sun talks teaching telescope terskol thermodynamics thesis tips tools Ubuntu utrecht vtt Zeeman

My Blog List

Bad Astronomy

The Supreme Court Keeps Throwing Judges Under the Bus. They’re Finally Fighting Back. - The Supreme Court’s shadow docket abuses have finally sparked a revolt.
42 minutes ago
michaelgalloy.com

IDL 9.2 released - The post IDL 9.2 released appeared first on michaelgalloy.com.
3 weeks ago
Math ∩ Programming

FHE@PDX 2025 - On Monday, July 14th 2025, I hosted a mini-workshop on homomorphic encryption at Google’s Portland, Oregon office. Though Portland is a small city, it’s be...
1 month ago
Robin's Blog

More links – June 2025 - I’ve got into a bit of a habit of writing occasional posts with links to interesting things I’ve found (probably because it’s a relatively easy blog post t...
2 months ago
GaussianWaves

Shrink to Win: Regularization’s Role in Model Success - Overfitting? Shrink your model! Regularization prevents memorization, enabling true learning & robust success. Discover how. A central problem in machine...
6 months ago
Strolls with my Dog

Minimalist ESF, LSF, MTF by Monotonic Regression - Because the Slanted Edge Method of estimating the Spectral Frequency Response of a camera and lens is one of the more popular articles on this site, I have...
7 months ago
AstroBetter

The Rumor Mill for 2024-2025 is ready to go! - The Rumor Mill ready for the new season is now up and running: Postdoc and Term and Faculty and Staff. The archives from previous years remain available. A...
11 months ago
Doctor Fortran

Fortran 2023 has been Published! - ISO published the latest revision of the Fortran standard, Fortran 2023, on November 17. We’ve been working on this for five years, and it brings many ne...
1 year ago
Science Books

Colossus in the Colosseum - JF Ptak Science Books Quick Post Here's an interesting combination of sweat and electricity--an enormous electrical device that was on display in an exhibi...
2 years ago
Variable Variability

One more reason I dislike linking climate change and extinction - Life is full of suffering. Especially in its final stage. Sorry to bother you with this truism we spend so much effort keeping away. But visiting a hospi...
3 years ago
Animals and Emotions

How to know if your dog has dementia: the seven most common signs and symptoms - I felt devastated when our lovely family dog, Thierry, couldn’t keep up with us anymore when he was about 12 years old. He would pace around the house ai...
3 years ago
Backyard Worlds: Planet 9

One Hundred Thirty-One Brown Dwarfs - Hi Everyone! We’ve been so busy following up your discoveries that we have fallen behind in our blogging. Here’s a long overdue update on the project. Fir...
6 years ago
Insights of a PhD student

Extract data from a PNG/TIFF - Sometimes it’s useful to be able to extract data from a published figure. If the figure isn’t a vector based format (for which the numeric data is probably...
6 years ago
AstroAtom

Special Session EWASS 2018: Atomic and molecular data needs for astronomy and astrophysics - The aim of this session is to encourage further dialogue and promote knowledge transfer between astronomers with strong atomic and molecular data needs and...
7 years ago
Bad Science

How do the world’s biggest drug companies compare, in their transparency commitments? - Here’s a paper, and associated website, that we launch today: we have assessed, and then ranked, all the biggest drug companies in the world, to compare th...
8 years ago
Space blog

Sir Martin's Royal Aeronautical Society Annual Dinner speech - Read Sir Martin Sweeting's views on the first 4 decades of the space era and the role that it plays in our everyday lives.
8 years ago
The Way the Future Blogs

Betty’s Advice to the Lovelorn - By Elizabeth Anne Hull Nearly a year before Fred died, I wrote to a young friend who had recently become engaged in a same-sex relationship. It was in re...
9 years ago
Climate Code Foundation

How to run ccc-gistemp with ISTI - Thanks to Piotr Djaków for prompting me to write this post. ISTI is the International Surface Temperature Initiative, previously I’ve written about using c...
10 years ago
Space Politics

A new chapter - I wanted to pass along some personal news: I’ve taken a position starting today with SpaceNews, as a senior writer there. I’ll be writing there on a lot ...
11 years ago
Built on Facts

Is Bitcoin Currently Experiencing a Selfish Miner Attack? - Is Bitcoin Currently Experiencing a Selfish Miner Attack? Probably not. All right, now that you know my conclusion, let's see how to get there with data....
11 years ago
Caltech Astrostats

MCMC lecture - http://videolectures.net/mlss09uk_murray_mcmc/
13 years ago
Living Reviews in Solar Physics - Blog

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The Eternal Universe

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Ever tried. Ever failed. No matter.
Try again. Fail again. Fail better.
Samuel Beckett, Worstward Ho (1983)

Background image

The picture in the background shows the continuum image computed from a snapshot of magnetoconvection simulation with unipolar magnetic field. The mean intensity is about 200 G typical for a plage region. The simulation is performed using the MURaM code (Vögler, 2003). More details are available in my paper on the activity sensitivity of the MnI 5394.7 A line in the solar spectrum (Vitas et al, 2009).