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| Joseph Arthur - In The Sun |
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Glastonbury Festival promo UK 2000-06-24.
The official 2002 promo video, directed by
Anton Corbijn, can be found at
http://realworldrecords.com/josepharthur/
Tags : Joseph Arthur live |
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Affichage : 439430
Durée : 208 s |
| In the sun |
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The beautiful song "In the sun" by Michael
Stipe and Coldplay. The original song is by
Joseph Arthur.
Tags : in the sun Michael Stipe |
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Affichage : 154747
Durée : 216 s |
| The Sun at 19.5nm |
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SOHO observations of the Sun's outer
atmosphere (FeXII at 19.5nm)
The level of solar activity goes through a
cycle of maxima and minima with one cycle
lasting roughly 11 years. In 1996 the Sun was
around minimum, and in 2000 it reached
maximum. In 2007 the Sun is again around
minimum at the end of the cycle (no. 23).
The level of solar activity is matched by the
number of sunspots on the Sun's surface.
Sunspots are regions with an increased
density of magnetic field lines that pass
through the Sun's surface. Inside these
regions, the surface is some 2000 degrees
cooler than normal and therefore appears dark
(in visible light), creating the distinctive
appearance of sunspots.
Usually sunspots occur in pairs, with two
sunspots of opposite sign as defined by the
direction of the local magnetic field: N
(outward magnetic field) and S (inward
magnetic field). The relative position of the
N (north) and S (south) sunspot is dependant
on the pair's location on the Sun's surface
and also changes with each solar cycle.
During cycle 23, on the Sun's northern
hemisphere the orientation of all sunspot
pairs is to have as leading and trailing spot
the N and S spot, respectively, with respect
to the Sun's rotation. On the southern
hemisphere the orientation is reversed with
the S spot leading and the N spot trailing.
With the next solar cycle this orientation is
flipped in both hemispheres, as the Sun's
global magnetic field reverses its
orientation.
As a new cycle begins, the number of sunspots
with the reverse orientation will increase
and the ones with the orientation of the old
cycle will decrease in number. In the
transition period they can both occur on the
Sun, as the two cycles have no sharp boundary
and overlap.
SOHO constantly monitors the Sun and will
continue to observe the evolution of the
sunspots and the solar activity during the
new solar cycle, which will culminate in the
solar maximum in about 5.5 years time. Solar
scientists predict that the upcoming solar
maximum will be very active and could even be
the most fierce in decades.
Tags : SOHO Sun FeXII 19.5nm astronomy |
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Affichage : 296335
Durée : 236 s |
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