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Astronomy Picture of the Day
A Sunspot Up Close
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#81555
by
[z]Barbara Harris
@
07.11.2005 00:00
- nach oben -
A Sunspot Up Close
Explanation:
Why would a small part of the Sun appear slightly dark?
Visible above is a close-up picture of a
sunspot
, a depression on the Sun's face that is slightly cooler and less luminous than the rest of the
Sun
.
The Sun's complex
magnetic field
creates this cool region by inhibiting hot material from entering the
spot
.
Sunspots
can be
larger than the Earth
and typically last for only a few days.
This high-resolution picture
also shows clearly that the
Sun's face is a bubbling sea of separate cells of
hot gas
.
These cells are known as
granules
.
A
solar granule
is about 1000
kilometers across and lasts about 10 minutes. After that, many
granules
end up exploding.
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