Download The Prelude - Solar Physics and Space Weather

yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Astronomical spectroscopy wikipedia, lookup

P-nuclei wikipedia, lookup

Timeline of astronomy wikipedia, lookup

Extraterrestrial life wikipedia, lookup

Astrobiology wikipedia, lookup

Formation and evolution of the Solar System wikipedia, lookup

Panspermia wikipedia, lookup

Outer space wikipedia, lookup

Spitzer Space Telescope wikipedia, lookup

Expansion of the universe wikipedia, lookup

Fine-tuned Universe wikipedia, lookup

Physical cosmology wikipedia, lookup

Ultimate fate of the universe wikipedia, lookup

Non-standard cosmology wikipedia, lookup

Shape of the universe wikipedia, lookup

Hubble Deep Field wikipedia, lookup

Universe wikipedia, lookup

Star formation wikipedia, lookup

Big Bang nucleosynthesis wikipedia, lookup

Advanced Composition Explorer wikipedia, lookup

Dark energy wikipedia, lookup

Space weather wikipedia, lookup

Energetic neutral atom wikipedia, lookup

Big Bang wikipedia, lookup

Cosmic microwave background wikipedia, lookup

Wilkinson Microwave Anisotropy Probe wikipedia, lookup

The Prelude
Jan. 26, 2011
CSI 661 / ASTR 530
Spring 2011
Jie Zhang
The Big Bang
History of the Universe
Physical Forces
Depending on temperature (T) and density (ρ)
•Inflation occurs at 10-35 second after the Big Bang when
temperature of universe dropped to 1027 K; at this temperature,
strong force became distinct from the electromagnetic-weak force
•Before the inflation, the space is “empty”, filled with only virtual
particles dictated by quantum mechanics
•Matter and energy of the universe is created during the inflation
•Just after the inflationary epoch, the universe was filled with
particles, antiparticles and energetic gamma-ray photons
Create Radiation
•At t=10-6 second, the temperature in the universe dropped to the
threshold temperature of 1013 K, at which the photons can not
produce proton and anti-proton pairs (and neutron and antineutron pairs)
•At about t = 1 second, temperature fell below 6 X 109 K,
electrons and positions annihilated to form low energy gammaray photons that can not reverse the process
•As a result, matter and anti-matter content decreased, and
radiation content increased
•From 1 second to 380,000 years, the universe is dominated by
the radiation (so called primordial fireball) derived from the
annihilation of particles and antiparticles created early by the
Create Ordinary Matter
•If there had been perfect symmetry between particles and
antiparticles, every particles would have been annihilated, leaving
no matter at all in the universe
•There are 109 photons in the microwave background for each
proton/neutron in the universe
•Therefore, there is a slight but important asymmetry between
matter and antimatter
•Right after the inflation, for every 109 antiprotons, there must
have been 109 plus one ordinary protons, leaving one surviving
after annihilation
Relics of primordial fireball
•When the universe was 3 minutes older, the temperature was low
enough to pass the deuterium (2H, one proton + one neutron)
bottleneck to further produce helium
•At 15 minutes, the temperature of the universe is too low for any
further nucleosynthesis
•Therefore, the relics of primordial fireball are hydrogen, helium
(1 helium out of every 10 protons), and photons (1 billion
photons for every proton)
•Heavier elements are formed later in the stars, not in the early
The State of the Universe
•Age: 13.7 billion years
•Composition: 73% dark energy, 23% dark matter, 4% ordinary matter
• This map shows 1.6 million galaxies from the 2MASS (TwoMicron All-Sky Survey) survey
• Supercluster of Galaxies lie along filaments
Our Galaxies
We are located in the
middle of the
Milky Way Galaxy
28,000 light years
from the center
One of 200 billion
stars in our Galaxy
Star Formation: Nebula
•Interstellar gas and dust pervade the Galaxy
•Nebula: a cloud of concentrated interstellar gas and dust; 104
to 109 particles per cubic centimeter
Star Formation: Protostar
•Protostar: the clump formed from dense and cold nebula
under gravitational contraction
•The protostar contracts, because the pressure inside is too low
to support all the mass.
•As a protostar grows by the gravitational accretion of gases,
Kelvin-Helmholtz contraction causes it to heat and begin
•When its core temperatures become high enough to ignite
steady hydrogen burning, it becomes a main sequence star
Star Formation: Protostar
Star Formation
•A protostar’s relatively low temperature and high luminosity
place it in the upper right region on an H-R diagram
The Sun
Solar wind
creates a big
around the
solar system,
by interacting
with the
The Earth
The Earth
3rd planet from
the Sun
1 AU = 150
million km
Travel time:
By light -8 minutes
By Solar Wind- ~ 100 hrs
The Sun-Earth Connection
Credit: NASA
Space Weather: the Process
It starts
from an
from the
depends on
how it
Space Weather: effects
Aurora; Geomagnetic Storm
From Space
Space Weather: effects
Adverse effects
Power failure due to
March 1989 storm
Damaged transformer
Space Weather: effects
On Human Space Exploration
On crew and
passengers of
Space Weather: effects
On Satellite Operation
Space Weather: effects
On Communication and Navigation
The driver of Space Weather
Coronal mass ejections
Heliosphere: solar wind
Spiral solar wind magnetic field: radial motion
of solar wind combined with Sun’s rotation
A cometshaped
around the
Currents in
particles in
Van Allen
Density fluctuation affects radio wave
reflection and transmission
Re-focus on Physics
Re-focus on Physics
Re-focus on Physics
The End