Presentation on theme: "PH1600: Introductory Astronomy Lecture 12: The Sun’s Atmosphere What is this?"— Presentation transcript:
PH1600: Introductory Astronomy Lecture 12: The Sun’s Atmosphere What is this?
PH1600: Introductory Astronomy Lecture 12: The Sun’s Atmosphere Study: Chapter 10 in The Cosmos book Next Lecture: The Sun’s Interior School: Michigan Technological University Professor: Robert Nemiroff Book: The Cosmos by Pasachoff & Filippenko Online Course WebCT pages: http://courses.mtu.edu/ This class can be taken online ONLY, class attendance is not required!
You are responsible for… Reading the book One chapter per “quiz period” Anything from that chapter can appear on quizzes or tests, even if I never mention them during my lecture(s) This quiz period covers Chapter 8 APODs posted during the semester APOD review every week during lecture Completing the Quizzes Chapter 1, 2, 4, 6, 7, & 8 quizzes already due Chapter 10 quiz due next See WebCT at http://courses.mtu.edu/ for detailshttp://courses.mtu.edu/
Kitt Peak National Observatory Credit & Copyright: AURA/ NOAO APOD: 1999 January 18
The Sun Visible during the day Closest star Relatively normal star Orbits in the Milky Way Galaxy Mostly hydrogen gas Then Helium, then “heavy elements” 5 billion years old
The Solar Spectrum Credit & Copyright: Nigel Sharp (NSF), FTS, NSO, KPNO, AURA, NSF APOD: 2006 April 23
The Sun Diameter: 1.4 million km 104 Earth diameters Mass: 2.0 x 10 30 kg 330,000 Earth masses Spin rate: 26 days at equator Temperature: 5800 K at photophere Average density: 1.4 g/cm 3 1.4 times that of water
An Erupting Solar Prominence from SOHO Credit: SOHO-EIT Consortium, ESA, NASA APOD: 2006 August 7
Sun’s Atmosphere Photosphere Sunspots, granules, faculas 5800 Kelvins Chromosphere Spicules, filaments, prominences, CMEs 10,000 Kelvins near the top Corona Coronal holes Very low density >1 million Kelvins (why?)
Solar Flares Cause Sun Quakes Credit: A. G. Kosovichev (Stanford) et al., MDI, SOHO, ESA, NASA APOD: 1998 June 1
Dark Sun Sizzling Credit: TRACE Project, Stanford-Lockheed Institute for Space Research, NASA APOD: 2006 July 10
Sunspot Cycle – Solar cycle Magnetic cycle takes 22 years 11 years for each polarity Solar maximum and Solar minimum Occur every 11 years Solar minimum in 2006 Many more sunspots near Solar Max Also more CME, flares, etc.
A Large Active Region Crosses the Sun Credit & Copyright: Jack Newton APOD: 2004 July 26
A Sunspot Up Close Credit : Vacuum Tower Telescope, NSO, NOAO APOD: 2005 November 6
Sunspot Metamorphosis: From Bottom to Top Credit: Dutch Open Telescope, Sterrekundig Instituut Utrecht APOD: 2005 February 16
Light Bridges on the Sun Credit: G. Scharmer, L. Rouppe van der Voort (KVA) et al., SVST APOD: 2000 May 22
The Sun's Surface in 3D Credit: G. Scharmer (ISP, RSAS) et al., Lockheed-Martin Solar & Astrophysics Lab. APOD: 2003 June 24
The Magnetic Carpet Of The Sun Credit: SOHO Consortium, ESA, NASA APOD: 1999 October 24
A Backward Sunspot and the New Solar Cycle Credit: MDI, SOHO, ESA, NASA APOD: 2006 August 30