A sweeping prominence, a huge cloud of relatively cool dense plasma is seen
suspended in the Sun's hot, thin corona. At times, promineces can erupt,
escaping the Sun's atmosphere. Emission in this spectral line shows the upper
chromosphere at a temperature of about 60,000 degrees K (over 100,000 degrees
F). Every feature in the image traces magnetic field structure. The hottest
areas appear almost white, while the darker red areas indicate cooler
temperatures. (Courtesy of SOHO/EIT consortium)
2
Detailed closeup of magnetic structures on the Sun's surface, seen in the
H-alpha wavelength on August 22, 2003. (Swedish 1-m Solar Telescope (SST)
operated by the Royal Swedish Academy of Sciences, Oddbjorn Engvold, Jun Elin
Wiik, Luc Rouppe van der Voort) #
3
NASA's STEREO satellite captured the first images ever of a collision between a
solar "hurricane", called a coronal mass ejection (CME), and a comet on April
4, 2007. The collision caused the complete detachment of the comet's plasma
tail. Comets are icy leftovers from the solar system's formation billions of
years ago. They usually hang out in the cold, distant regions of the solar
system, but occasionally a gravitational tug from a planet, another comet, or
even a nearby star sends them into the inner solar system. Once there, the
sun's heat and radiation vaporizes gas and dust from the comet, forming its
tail. Comets typically have two tails, one made of dust and a fainter one made
of electrically conducting gas, called plasma. (NASA/STEREO) #
4
Image of an active solar region taken on July 24, 2002 near the eastern limb of
the Sun. The image highlights the three-dimensional nature of the photosphere
when seen at these large angles. The structures in the dark sunspots in the
upper central area of the image show distinct elevation above the dark "floor"
of the sunspot. The height of the structures has been estimated by Dr. Bruce
Lites of the High Altitude Observatory to be between 200 and 450 km. The
smallest resolvable features in the image are about 70 km in size. There are
also numerous bright "faculae" visible on the edges of granules that face
towards the observer. (Prof. Goran Scharmer/Dr. Mats G. Löfdahl/Institute for
Solar Physics of the Royal Swedish Academy of Sciences) #
5
The total solar eclipse of February 16, 1980 was photographed from Palem,
India, by a research team from the High Altitude Observatory of the National
Center for Atmospheric Research. The photograph of the solar corona was taken
with a camera system developed by Gordon A. Newkirk, Jr. This specialized
instrument photographs the corona in red light, 6400 A -- through a radially
graded filter that suppresses the bright inner corona in order to show the much
fainter streamers of the outer corona in the same photograph. (Rhodes College,
Memphis, Tennessee / High Altitude Observatory (HAO), University Corporation
for Atmospheric Research (UCAR)) #
6
The planet Venus is seen by NASA's TRACE satellite, at the start of its transit
across the sun on June 8, 2004. (NASA/TRACE) #
7
A view of a sunspot and granules on the Sun's surface, seen in the H-alpha
wavelength on August 4, 2003. (Swedish 1-m Solar Telescope (SST) operated by
the Royal Swedish Academy of Sciences, Göran Scharmer and Kai Langhans, ISP) #
8
Solar flares produce seismic waves in the Sun's interior that closely resemble
those created by earthquakes on our planet. On May 27, 1998, researchers
observed this flare-generated solar quake that contained about 40,000 times the
energy released in the great earthquake that devastated San Francisco in 1906,
equivalent to an 11.3 magnitude earthquake, scientists calculated. Over the
course of an hour, the solar waves traveled for a distance equal to 10 Earth
diameters before fading into the fiery background of the Sun's photosphere.
Unlike water ripples that travel outward at a constant velocity, the solar
waves accelerated from an initial speed of 22,000 miles per hour to a maximum
of 250,000 miles per hour before disappearing. (Courtesy of SOHO/EIT
consortium. SOHO is a project of international cooperation between ESA and
NASA) #
9
An animation of the sun, seen by NASA's Extreme ultraviolet Imaging Telescope
(EIT) over the course of 6 days, starting June 27, 2005. (Courtesy of SOHO/EIT
consortium) #
10
Hinode (formerly known as Solar-B) successfully captured a massive solar flare
on 13 December 2006. It was one of the largest flares occurring in that period
of solar activity minimum. (JAXA/NASA/PPARC) #
11
The image shows the corona for a moderately active Sun, with some (red) hot
active regions in both hemispheres, surrounded by the (blue/green) cooler
plasma of the quiet-Sun corona. Notice also the north polar-crown filament, the
trans-equatorial loops, and the coronal hole in the south-east (lower-right)
corner of the image and the smaller one over the north pole. This image shows
the solar corona in a false-color, 3-layer composite: the blue, green, and red
channels show the 171Å, 195Å, and 284Å wavelengths, respectively (most
sensitive to emission from 1, 1.5, and 2 million degree gases). (TRACE Project,
Stanford-Lockheed Institute for Space Research, NASA) #
12
A view of an irregular-shaped sunspot and granules on the Sun's surface, seen
on August 22, 2003. (Swedish 1-m Solar Telescope (SST) operated by the Royal
Swedish Academy of Sciences, Oddbjorn Engvold, Jun Elin Wiik, Luc Rouppe van
der Voort, Oslo) #
13
On November 8, 2006, Mercury is seen, beginning a transit in front of the Sun.
(NASA/TRACE) #
14
This TRACE 171Å-wavelength image from November 11, 2006 shows a sizeable active
region at the east limb of the Sun (rotated clockwise 90 degrees so north is to
the right) just as it rotates onto Earth-facing hemisphere. Notice the
low-lying dark structures of filaments at the leading edge of the region, some
"levitating" dark material on the right-hand side of the region, and the small
ephemeral region towards the lower right. (NASA/TRACE) #
15
The Sun, observed on May 22, 2008. With the Sun persisting in a near-minimal
state of activity, only a few small regions of some activity are seen on the
disk. The cell-like appearance is formed by the multitude of small clusters of
magnetic flux that are collected in the downflow regions of the supergranular
network of convective motions. (NASA/TRACE) #
16
A display of thin loops is seen arching above active regions of the Sun on
January 1, 2001. (Courtesy Dick Shine, NASA/TRACE) #
17
This LASCO C2 image, taken 8 January 2002, shows a widely spreading coronal
mass ejection (CME) as it blasts more than a billion tons of matter out into
space at millions of kilometers per hour. The C2 image was turned 90 degrees so
that the blast seems to be pointing down. An EIT 304 Angstrom image from a
different day was enlarged and superimposed on the C2 image so that it filled
the occulting disk for effect (Courtesy of SOHO/LASCO consortium) #
18
Detailed closeup of magnetic structures on the Sun's surface, seen in the
H-alpha wavelength on August 22, 2003. (Swedish 1-m Solar Telescope (SST)
operated by the Royal Swedish Academy of Sciences, Oddbjorn Engvold, Jun Elin
Wiik, Luc Rouppe van der Voort, Oslo) #
19
NASA's STEREO (Ahead) spacecraft observed this visually stunning prominence
eruption on Sept. 29, 2008 in the 304 wavelength of extreme UV light. It rose
up and cascaded to the right over several hours, appearing something like a
flag unfurling, as it broke apart and headed into space. The material observed
is actually ionized Helium at about 60,000 degrees. Prominences are relatively
cool clouds of gas suspended above the Sun and controlled by magnetic forces.
(NASA/STEREO) #
20
A transit of the Moon across the face of the Sun on February 25, 2007 - but not
seen from Earth. This sight was visible only from the STEREO-B spacecraft in
its orbit about the sun, trailing behind the Earth. NASA's STEREO mission
consists of two spacecraft launched in October, 2006 to study solar storms.
STEREO-B is currently about 1 million miles from the Earth, 4.4 times farther
away from the Moon than we are on Earth. As the result, the Moon appears 4.4
times smaller than what we are used to. (NASA/STEREO) #
21
On September 30, 2001, TRACE observed an M1.0 flare in an active region very
near to the solar limb. Fragments of a prominence hovered above the regions,
with filamentary dark (relatively cool) material moving along the field lines,
which then spread to form this dragon-like bright outline. (NASA/TRACE) #
Get rid of Add-Ons in your email ID get [email protected]. Sign up now!
http://in.promos.yahoo.com/address
