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Apostolos Christou

Latest News

How to determine if an emission line is optically thin or thick?

The transition region in the Sun is the atmospheric layer that separates the cooler chromosphere from the hotter corona. Studying the structure and dynamics of the transition region requires greater attention as these provide critical information on the supply of mass and energy from the lower atmosphere to the corona and Read more…

By Apostolos Christou, 2 yearsApril 30, 2020 ago
Solar System

Observations during a pandemic and the story of the comet C/2019 Y4 (ATLAS)

By Galin Borisov (not the interstellar comet discoverer) During this tough period of COVID-19 pandemic, most of the astronomical observatories around the world are closed and no observations are carried out. But my Bulgarian colleague, Yanko Nikolov, decided to self-isolate in the mountain and fulfil the observations with the 2m Read more…

By Apostolos Christou, 2 yearsApril 29, 2020 ago
Research News

Stellar Flares and Star Spots unexpectedly found to be uncorrelated

By Christopher Duffy Studies of the sun, our closest star, have shown that sun spot activity and solar eruptions, also known as solar flares, are strongly correlated – regions of the sun with many sun spots are found to be the typical point of origin for most solar flares. This Read more…

By Apostolos Christou, 2 yearsApril 23, 2020 ago
Solar System

Venus Resplendent

Those of you going out late in the day for an evening stroll or just enjoying the spring smells in your garden may have noticed a bright white beacon of light shining high in the west after sunset. This is Venus, the closest planet to the Earth and the brightest Read more…

By Apostolos Christou, 2 yearsApril 16, 2020 ago
Research News

Dynamics and energetics of solar coronal loops

By Professor Gerry Doyle The solar chromosphere is a complex magneto-plasma system that offers the evolution of a variety of plasma dynamics (e.g., jets, mass motions, shocks) as well as magnetic waves. It is separated by the inner corona through the particular discontinuities of mass, density, temperature, characteristic speeds, etc. Read more…

By Apostolos Christou, 2 yearsApril 8, 2020 ago
Research News

UK experts on Coronavirus

By Marc Sarzi, AOP Head of Research In an age dominated by fast-paced but also dispersive and often incorrect communications, we are often exposed to misleading or irrelevant information. Obtaining reliable news and advice is particularly important today as we live through the middle of the COVID-19 pandemic. For this Read more…

By Apostolos Christou, 2 yearsApril 6, 2020 ago
Solar System

C/2019 Y4 (ATLAS): The bright comet of 2020?

It’s not every day, or every year for that matter, that we get to see a really bright comet. Many of us, including the author of this article, remember comet Hale-Bopp that adorned Earth’s skies in the first months of 1997. Since then we’ve had several comets bright enough to Read more…

By Apostolos Christou, 2 yearsApril 1, 2020 ago
Research News

Comet Encke and a prehistoric village

By Bill Napier, AOP Visiting Astronomer A comet typically comprises about 50% fine dust embedded in a frozen matrix of water, methane, carbon dioxide and other organic compounds. Approaching the inner planetary system it begins to disintegrate, with fragments splitting off along with dust and gas. The fragments spread around Read more…

By Apostolos Christou, 2 yearsMarch 6, 2020 ago
Research News

THE SUN AS WE’VE NEVER SEEN IT BEFORE: CLEAREST AND MOST DETAILED IMAGES YET OF THE SUN RELEASED

Just released are first images and videos from the National Science Foundation’s (NSF) Daniel K. Inouye Solar Telescope (DKIST) – revealing unprecedented detail of the Sun’s surface, with experts saying it will enable a new era of solar science and a leap forward in understanding the Sun and its impacts Read more…

By Apostolos Christou, 2 yearsJanuary 30, 2020 ago
Earth Satellites

Armagh astronomers study solar explosions

AOP researchers have used data from a NASA space mission to shed light on one of the most violent phenomena in our solar system – magnetic explosions on the surface of the Sun. Abhishek Srivastava, formerly a research associate at AOP and now a solar scientist at the Indian Institute Read more…

By Apostolos Christou, 3 yearsDecember 19, 2019 ago

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RSS Intergalactic Craic
  • Space is Cloudy, Who Knew? Featuring Kerem Çubuk
    This week Heather and Courtney interview Armagh Observatory PhD Candidate Kerem Çubuk on his area of research - molecular clouds! Turns out we can't escape the cloudy conditions, even millions of lightyears away.  Kerem and his colleagues also have a Youtube Channel dedicated to science communication in Turkish. To find out more, visit ahtapot.club 
  • The Craic with Climate
    This week, Heather and Courtney are joined by AOP's own Anna Taylor - climate Education Officer extraordinaire to discuss the most frequently asked questions about climate change and what we can do to help! #NISCIFEST22
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    This week Courtney fills Heather in on The Fermi paradox and The Great Filter. If there a million options for life elsewhere in the galaxy, why haven't we met aliens yet? Need Some Space? 
Welcome to Astronotes

Hello and welcome to Astronotes, the Armagh Observatory and Planetarium’s official blog. Here you will find the latest news and views from all those who work in our organisation, from the fascinating worlds of astronomy and space exploration. We hope you will come here to learn what is hot and exciting, profound or even weird from worlds beyond ours . So that's the introduction out of the way, now on with the Universe!

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