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Presentation transcript:

Prepare your scantron: Fill in your name and fill the bubbles under your name. LAST NAME FIRST, First name second Put your 4-digit code instead of “ IDENTIFICATION NUMBER ”. --- (The last 4 digits of your OleMiss ID.) Question # 1: answer A Question # 2: answer B Question # 3: answer D Setup: Please take a moment to mute your cell phone! Use a pencil, not a pen! P/f coming – today Reading assignment Chapter 5, pp (Light and matter)

sec 45 Question Next question coming … Where in the Sun is energy produced? A Everywhere. B In all the core and in the radiative envelope that surrounds the core. C Only in the photosphere D Only in the core. E Nowhere. This question counts double!

sec 45 Question Next question coming … Why does the photosphere look grainy in a telescope? A The strong heat from below causes cracks on the surface of the Sun. B Rising hot bubbles reach the surface and glow until they cool down and sink. C The magnetic field of the Sun makes gas glow when charged particles cross it. D Clouds float over the photosphere. E Asteroids keep falling into the Sun and burn up in the intense heat. This question counts double!

sec 45 Question Next question coming … How long does the full solar cycle last, including the magnetic field reversal? A 1 year. B 2 years. C 11 years. D 22 years. E 370 years. This question counts double!

sec 30 Question 7 29 How often can you see a solar flare in a telescope in white light? (That is, without special color filters.) How long does it stay visible? A Once a day; ten minutes. B Once a day; a few seconds. C Once every half an hour; ten minutes. D Once a month; ten minutes. E Once a month; a few seconds This question counts double!

Prominences Seen in H  light (only) Gas follows Magnetic field lines

Solar flares Magnetic heating causes nuclear explosions Rare event: -once in a month at solar maximum - flare lives for ten minutes Spits out a lot of gas - gas may leave the Sun Do not confuse flares with prominences: flares are rare and may cause eruptions or prominences prominences need not originate in flares

What if an eruption hits Earth? Charged matter from the Sun is deflected by Earth ’ s magnetic field towards the Arctic and Antarctica

Aurora Borealis& Australis

(from space)

Green aurora Aurora Borealis in Canada

Red aurora the color varies because the energy of the charged particles varies. Watch Themis movie!

Questions coming …

sec 30 Question 8 29 What causes aurora? A Exhaust gases from spacecraft. B Charged particles, freed up when atomic bombs blow up. C Cosmic radiation from distant galaxies. D The Sun spits out charged particles and they hit Earth. E The asteroid belt shines in reflected sunlight Next question coming …

sec 30 Question 9 29 What happens when a solar eruption hits Earth? A Hurricanes arise. B Lightening and thunder is caused. C Volcanoes erupt. D Shooting stars fall from the sky. E Aurora flares up Next question coming …

sec 45 Question Why is aurora very rare in Mississippi? A Because the temperature is warm all year. B Because aurora can be seen only in places with very dry climate. C Because Mississippi is closer to the Moon than the Arctic or Antarctica. D Because the magnetic field of Earth deflects charged particles. E Because the Earth spins faster near the equator.