|
|
 |
|
|
| Joseph Arthur - In The Sun |
 |
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 |
|
Affichage : 398363
Durée : 208 s |
| In the sun |
 |
The beautiful song "In the sun" by Michael Stipe
and Coldplay. The original song is by Joseph
Arthur.
Tags : in the sun Michael Stipe |
|
Affichage : 136525
Durée : 216 s |
| The Sun at 19.5nm |
 |
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 |
|
Affichage : 272696
Durée : 236 s |
|
|
|
|
|
|
|
|
|
|
 |
| |
|
