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The Sun as red disk with bright patches and long dark strands. Several small wispy features protrude from the disk's edge

H-alpha image of the Sun's chromosphere

image

Caption: This false-color image was captured with a 10-cm telescope at the Big Bear Solar Observatory (BBSO) in the United States in July 2002. It depicts the full disk of the Sun using the H-alpha emission line of hydrogen. When observed in this spectral line, the Sun's chromosphere appears particularly prominent due to hydrogen atoms emitting light at the specific wavelength. This emission produces a distinctive red color, making features such as spicules (jets of plasma that look hair-like) and plage (bright patches in the chromosphere) highly visible. Several small solar prominences can be seen protruding from the edge of the solar disk. When prominences (also known as filaments) cross the face of the disk they appear as dark threads caused by the cooler material in the prominence absorbing light. The chromosphere is also visible in the violet part of the solar spectrum due to ionized calcium showing emissions in these wavelengths.
Credit: Big Bear Solar Observatory (BBSO)/New Jersey Institut of Technology (NJIT)
Credit Link

Glossary Terms: Chromosphere , Solar Prominence , Sun , Spectral Line
Categories: The Sun

License: Public Domain Public Domain icons

File ( image 2.82 MB)


illustration image for  Measure the Solar Diameter

Measure the Solar Diameter

astroEDU educational activity (links to astroEDU website)
Description: Hands-on activity to measure the Sun by using household materials.

Glossary Terms: Orbit , Sun
Tags: Hands-on , Measurement , Observing , Scales
Age Ranges: 12-14 , 14-16 , 16-19 , 19+
Education Level: Middle School
Areas of Learning: Structured-inquiry learning
Costs: Low Cost
Group Size: Group
Skills: Communicating information , Constructing explanations , Using mathematics and computational thinking
Authors: Edward Gomez

License: Creative Commons Attribution 4.0 International (CC BY 4.0) Creative Commons Attribution 4.0 International (CC BY 4.0) icons


Image showing groups of sunspots as dark patches which lie in bands above and below the Sun's equator

Sunspots

image

Caption: In this image the sun peppered with groups of sunspots over almost nine days between July and August 2012. The sunspots seen in this image have been sources of the solar flares and coronal mass ejections (CME). In this image particulary, the sun is approaching solar maximum in its cycle (solar cycle), where we see many spots forming along the suns' equator. These sunspots and activity are seen in the southern hemisphere, before then most of the activity was on the northern hemisphere.
Credit: NASA/SDO/HMI
Credit Link

Glossary Terms: Sun , Sunspot , Stellar Activity
Categories: The Sun

License: Public Domain Public Domain icons

File ( image 153.32 kB)


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