OUR SUNOUR SUN

OUR SUNOUR SUN

Solar Nebula:- Cloud of gas and dust that developed into the solar system.- Our Sun was developed as a star from the burning of Hydrogen gas.

Nebular Theory- Accepted idea that the sun and the planets condensed out of a spinning cloud of gas and dust.

OUR SUNOUR SUN

WORK ON:- Objectives 4.02 + 4.03

- Begins on page 571 of your book

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OUR SUN

Core Hydrogen fusion H + H → He + energy

Radiative Zone Radiative Zone Energy travels

outward from core along electromagnetic (EM) radiation

R-M-I-V-U-X-G “Random

walk” of photons

CONVECTIVE ZONE Convectio

n currents

Hot gases rise to surface, cooler gases sink

PhotospherePhotosphere Solar

surface Granular

texture Sunspots

appear

Granulation Clip

ChromosphereChromosphere

Solar atmosphere

Solar storm activity observed

Chromosphere

CORONA

“Crown” Seen only during

solar eclipses Heated by

magnetic field Solar wind

                                                                                                  

The SUN Explained (further)

Please take out your SUN Objective notes

Atomic Structure of Sun’s Core

Hydrogen Atoms (H) splitting to Helium (He) Atoms Causes a great amount of energy

See 5 step process in book page 572

5-step process of Nuclear Fusion

Sunspots

Cool, dark areas of gas within the photosphere.

Caused by powerful magnetic fields. Slows down convection currents to the

Photosphere, causing a cooling of certain areas of the surface.

Solar Prominence:

- Cloud of glowing gases that arches high above sun’s surface.

Granulation

caused by the convection, or `bubbling' of the sun.

Solar wind Ions are so hot,

gravity can’t hold them onto the sun

Solar flare Violent eruptions of plasma and EM photons

Solar Flare

Coronal Mass Ejection

Massive burst of Solar Wind (above the Corona) being released into Space.

Solar Storms and Aurora’s on Earth

AURORAS(Northern lights)

Aurora Borealis

Northwest Territories, Canada

MENOMINEE, MI (OCT 11,2001)

FINLAND (OCT 1, 2001)

Aurora over Lake Superior

AURORA BOREALIS

Michigan

Solar activity gets ejected from the sun, Solar Winds carry them through space (towards Earth and other planets), Earth’s Magnetosphere protects the earth by diverting solar winds to the North + South poles, as a result we see Aurora’s (Northern/Southern Lights)

DAILY SOLAR FORECASTS

Describe the Sunspot cycleDescribe the Sunspot cycle

Sunspot (Solar Cycle) 11 Year cycle Max to Max (min to

min) = 11 years Last Max = 2008

Influences solar activity heading towards Earth (more Aurora’s)

Go to your LAB GROUPS Sun Review

Use p. 571 of your book for help.