Our first Competition! The prize of a signed copy of our latest book: François Félix Tisserand – forgotten genius of celestial mechanics is on offer to the fortunate person who wins our free-to-enter competition. Everyone correctly answering the following question will go forward into our prize draw…
Where were the parents of François Félix Tisserand married?
To enter please use our competition entry form here. The draw for the winner will be made at noon on the 269th birthday anniversary of Pierre Simon Laplace (23rd March 2018) and the winner will be notified via email on that afternoon. The prize will be sent very shortly afterwards and no postal surcharges will be applied if the winner is living outside the UK.
Note: If you purchase a copy of our biography of Tisserand then you will be automatically entered into our prize draw. If you are the winner, full purchase and postal costs of your book will be refunded to you.
In this month’s blog we return to the Sun. Having discussed gravitation, pressure, emissions, radiative and convective energy transfer process, we now begin a more descriptive (i.e. less maths!) series looking at the structure, visible features, and atmosphere of our star.
Notre premier concours! Nous avons décidé d’organiser un concours gratuit et le prix sera un exemplaire signé de notre dernier livre François Félix Tisserand – forgotten genius of celestial mechanics offert au heureux gagnant. Chaque personne qui donne la bonne réponse à la question suivante sera inscrit à notre tirage au sort:
Où a eu lieu le mariage des parents de Félix Tisserand?
Pour participer, merci de utiliser notre formulaire ici. Le tirage aura lieu à midi le 269e anniversaire de Pierre Simon Laplace (samedi 23 mars).
A Noter: Si tu achète un exemplaire de notre livre sur Tisserand, vous serez automatiquement inscrit pour le tirage, et si vous gagnez les frais d'affranchissement et le prix du livre vous seront remboursés
Ce mois nous reviendrons sur le Soleil. Nous avons déjà parlé de la gravité, la pression, les emissions et le transfer d'energie radiatif et convectif, mais nous allons commencer une série plus descriptive (moins de maths) où nous considérons la structure, les caracteristiques visibles et l'atmosphere de notre étoile.
Anatomy of a star
In April we saw how the Sun produces its energy, in May we saw how the gravitational and pressure forces are generally in balance and mean the Sun is in Hydrostatic equilibrium, and in June we talked about convection heat transfer. This month we will see how these all ‘fit’ into the structure of the Sun. We begin by presenting an overview of the current model of the structure for the Sun.
Solar Structure overview
In this picture, which is based upon a photograph of the sun taken at the H𝝰 wavelength (654nm, the extreme red part of visible light spectrum), the key components are marked numerically and refer to:
We will continue our blog over the next few months looking at detail into each of the major components of the Sun, with just an introduction to each here now. On our way we will review the temperature, pressure and density conditions within the Sun and show how we can estimate these fundamental properties. We will take a brief look at the emerging science of helioseismology (asteroseismology when applied to other stars) and how this can and has been used to inform us of the Sun’s interior. The nature and source of the Sun’s magnetic field(s) will be considered and we’ll see the effects these have on observational features and the solar atmosphere.
(In ascending level of technical complexity)
 The Sun – Shining light on the Solar System. Neil Taylor. 2017
Having considered atmospheric retention for the Earth last month, we will start our more detailed discussions on the structure of the Sun next month by looking at the solar atmosphere, and specifically the Corona. Next month’s blog will be issued on Saturday 31st March.