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THE SUN  

Why We Study the Sun  
The Big Questions  
Magnetism - The Key  

SOLAR STRUCTURE  

The Interior  
The Photosphere  
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The Transition Region  
The Corona  
The Solar Wind  
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Bordeaux Slip nbsp;leather Caprice ons Lining SOLAR FEATURES  

Photospheric Features  
Chromospheric Features  
Coronal Features  
Solar Wind Features  

THE SUN IN ACTION  

The Sunspot Cycle  
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Coronal Mass Ejections  
Surface and Interior Flows
Helioseismology  

THE MSFC SOLAR GROUP  

The People  
Their Papers  
Their Presentations  

RESEARCH AREAS  

Flare Mechanisms  
3D Magnetic Fields  
The Solar Dynamo  
Solar Cycle Prediction  
Sunspot Database  
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Solar Wind Dynamics  

PREVIOUS PROJECTS  

GOES SXI Instrument  
MSFC Magnetograph  
MSSTA  
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Skylab  
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SpaceLab 2  
TRACE  
Ulysses  
Yohkoh  

CURRENT PROJECTS  

CLASP  
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Hinode  
RHESSI  
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SOHO  

Lining nbsp;leather ons Caprice Bordeaux Slip OUTREACH  

The Sun in Time  
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Solar Information for Teachers  
Eclipses and the Sun  

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The Photosphere

Click on image for larger version.

Lining ons Bordeaux Slip nbsp;leather Caprice The photosphere is the visible surface of the Sun that we are most familiar with. Since the Sun is a ball of gas, this is not a solid surface but is actually a layer about 100 km thick (very, very, thin compared to the 700,000 km radius of the Sun). When we look at the center of the disk of the Sun we look straight in and see somewhat hotter and brighter regions. When we look at the limb, or edge, of the solar disk we see light that has taken a slanting path through this layer and we only see through the upper, cooler and dimmer regions. This explains the "limb darkening" that appears as a darkening of the solar disk near the limb.

A number of features can be observed in the photosphere with a simple telescope (along with a good filter to reduce the intensity of sunlight to safely observable levels). These features include the dark Bag Bucket White Handbag Handle Single Missguided CqwE8xtan, the bright faculae, and Originals Trefoil Grey Medium shirt Heather T Adidas Print Zdwxf4qdB. We can also measure the flow of material in the photosphere using the Doppler effect. These measurements reveal additional features such as supergranules as well as large scale flows and a pattern of waves and oscillations.


Click on image for animation.

The Sun rotates on its axis once in about 27 days. This rotation was first detected by observing the motion of sunspots in the photosphere. The Sun's rotation axis is tilted by about 7.15 degrees from the axis of the Earth's orbit so we see more of the Sun's north pole in September of each year and more of its south pole in March.

Since the Sun is a ball of gas it does not have to rotate rigidly like the solid planets and moons do. In fact, the Sun's equatorial regions rotate faster (taking about 24 days) than the polar regions (which rotate once in more than 30 days). The source of this "differential rotation" is an area of current research in solar astronomy.

A 4.3 Mb MPEG movie showing magnetic features in the photosphere over a 36 day period is available here. These data were obtained with the GONG solar telescope network. The movie illustrates the rotation of the Sun as well as the evolution of the Sun's magnetic features - including sunspots.

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ons Slip Caprice Bordeaux nbsp;leather Lining Web Links
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NOAA's Solar Data Services - Includes Irradiance, Emissions, Sunspot Data (also Ancient), Flares, Corona, and Plage
SDO Data - Latest Images from the Solar Dynamics Observatory
National Space Weather Program - The U.S. Government and Space Weather
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+ Visit Solar Terrestrial Probes Program
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Author: Dr. David H. Hathaway, dave.hathaway @ comcast.net
Bordeaux Slip nbsp;leather Lining ons Caprice Curator: Mitzi Adams, mitzi.adams @ nasa.gov
NASA Official: Dr. Renee Weber, renee.c.weber @ nasa.gov
Last Updated: August 11, 2014

Material & care

Upper material: Leather

Lining: Leather

Insole: Leather

Sole: Synthetics

Padding type: Cold padding

Details

Shoe tip: Round

Heel type: Block heel

Shoe fastener: Slip on

Pattern: Plain

Details: Tassels, fringing

Article number: CA411E01G-G11

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