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First Years: Lesson Four; *Archived*
Topic Started: Apr 1 2018, 06:49 PM (89 Views)
Professor Sarah Harrington
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Mother of Two Girls | Astronomy Professor | HS Graduate Ravenclaw

[justify]Professor Harrington had been having a lovely day. She was excited to see her first year students again. She heard them outside the door and let them in greeting all of them. "Good Evening! I hope you all are doing well! Today we are going to be discussing the Sun, funnily enough it has a long set past the horizon so we'll just have to use a diagram in viewing the Sun tonight, which will be much better for our eyes anyways," she said setting up a diagram of the Sun in the front of the classroom.

"For millions of years, the Sun has been worshiped as a god, the giver of life and light. Without it we wouldn't be here to talk about it! It allows plants to grow and along with some other basic elements keeps our planet on track." Sarah said as the students began to take notes already. "Now, I am going to give you some basic information about the many layers of our sun, so keep some notes, and don't fall asleep." She smiled and then picked up a piece of chalk and began to write on the chalkboard.
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ABOUT THE SUN
 


[justify]The Core: It is incredibly dense, most would think because of its density it would be a solid however it is so hot, 15 million Kelvin's (27 million degrees Fahrenheit) to be exact, the core is in a gaseous state. The core is the 'heart' of our sun. Here fusion reactions produce energy called gamma rays and neutrinos. Gamma rays are photons with a very high energy and frequency. The rays are absorbed and then re-emitted by atoms on their way out of the sun. The core contains 40% of the suns mass in 10% of its volume.

Solar Envelope: It is broken into two areas, the radioactive envelope, and the convective envelope. This layer is not as dense as the core and its temperature is around 4 million Kelvin's or 7 million degrees Fahrenheit. The Envelop puts pressure on the core and maintains the temperature for fusion to take place. The hotter the gas is the more transparent it is, so this area of the sun is more opaque than the core. This causes it to be less efficient for energy to move by radiation and heat builds up in the radioactive area, this is how the convection zone is created. It is huge cells of moving gas several hundred kilometers in diameter.

Photosphere: This is where our sun light is emitted. This area is a layer of low-pressure gasses just outside the envelope. It is only a few hundred kilometers thick and about 6000 degrees Kelvin. You can find out the composition, temperature, and pressure by analyzing the color spectrum of sunlight. A little side fact, helium was discovered by Mr. William Ramsey. He was analyzing the spectrum of sunlight when he found features that were not present in anything on earth. He named it helium after the Greek God of the Sun Helios.

Chromosphere: After the photo sphere the layers of the sun gradually become hotter again. In an eclipse, you can see this layer on occasion as the red circle outside the sun. Its red color is caused by the amount of Hydrogen. The other layers get cooler as they get farther away from the core; however, this layer is 7000k. Temperature increases through the Corona.

Corona: The Corona is the farthest layer of the sun. It is only visible during an eclipse. It is very low density because it is a cloud of plasma with a high transparency, unlike the inner layers. The white Corona is a million times 'less' bright than the inner layers of the sun but many, many times larger. We find this layer to be hotter than the inner layers with a temperature of 1 million degrees Kelvin or 2 million degrees Fahrenheit as an average but some areas can become 3 million degrees, Kelvin.
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"Now, the sun has been studied with a great deal by wizard astronomers and a certain witch notably named Elizabeth Willowvale has noticed that solar flares are not what muggles think they are, as they believe they are storms on the sun, and we won't go into that, but the flares are actually magic projecting out from the Sun towards us, towards the Solar System, and if we didn't have these solar flares there would be no magic, it's what is keeping magic running, and the amount of energy that goes into this is phenomenal." Professor Harrington glanced at her clock on her desk and smiled up at the students.

"Sadly, that is all the time we have for today, you may go once you've finished copying down the board." she smiled. "Oh and don't forget the homework while you're at it." she added. Sarah waited for the last student to head out before going out herself and locking up the rooms behind her. She was feeling tired and was ready for a full night's rest.


Homework:
-Roleplay the lesson and take some notes.
-Write a short essay about the Sun with information not provided in class. (Please make sure to have your source listed once again and by this I mean the website you(ooc) are using for your character!)
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Astronomy,1,4
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Professor of Astronomy
Years 1-7


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Arvel Ayers
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Socially Inept • Pessimist • Lazy • HM Intern • Hyper-Empathetic • Alternate Chaser

Arvel didn't know how he was supposed to concentrate on Astronomy when he had so many other things occupying his mind. It was such a boring subject for a magical school, anyway; he'd learned about the moon and the sun and the planets ages ago, before he'd been able to cast magic spells. Now it seemed like a waste of time. He sighed, making it look as if he were taking notes, though really he was working on his article for the Hogwarts Monthly. He only had a vague idea of what he wanted to write, and he couldn't seem to write more than two sentences before striking through them and starting over again. It was all so useless. He was angry at the people who had stood around and watched Professor Pendleton, but he couldn't write about that. It wouldn't help. Besides, he'd been among those people, until seeing the man cry had finally prompted him to leave. Did that make him a hypocrite? Realising he wasn't paying much attention, Arvel took some real notes. If he didn't do well in his exams, his dad was going to be disappointed in him. Why did everyone care so much about a few stupid exams?
biographytheme
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Analei Louw
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Working on restraint.

[justify]Of course they had to have the most hard boring subject at nighttime. What a way to whack up their sleeping schedules. Analei didn't see the point in having to study the stars, and her lack of sleep made her more grouchy than normal. She smiled at Arvel. He seemed really lovely, even though they had met over terrible circumstances. The Hufflepuff girl was worried about the Potions Professor, and hoped that he would be well enough to take their next Potions class. Analei wanted to sit with Arvel, but she wasn't sure if he would like that, so she took her normal seat, dragging out her quill and parchment. Most of the information was boring, but she did love the fact that it was solar flares that kept magic running. Analei quickly jotted down the homework, a little bit anxious about having to do the essay, but it would have to wait until the next day. She was far to tired to bother with it now.
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Homework
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Thank you Claire you babe :wub:
BIOGRAHPY . DEVELOPMENT . AESTHETIC
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