Aerospace Environment ASEN-5335
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Aerospace Environment ASEN-5335 • Instructor: Prof. Xinlin Li (pronounce: Shinlyn Lee) • Contact info: e-mail: [email protected]. edu (preferred) phone: 2-3514, or 5-0523, fax: 2-6444, website: http://lasp.colorado.edu/~lix • Office hours: 9:00-11:00 pm Wed at ECOT 534, Tue & Thu, after class. • Read Chapter 1 & 2.
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Aerospace Environment ASEN-5335. Instructor: Prof. Xinlin Li (pronounce: Shinlyn Lee) Contact info: e-mail: [email protected] (preferred) phone: 2-3514, or 5-0523, fax: 2-6444, website: http://lasp.colorado.edu/~lix - PowerPoint PPT Presentation
Transcript of Aerospace Environment ASEN-5335
Aerospace EnvironmentASEN-5335
• Instructor: Prof. Xinlin Li (pronounce: Shinlyn Lee)
• Contact info: e-mail: [email protected] (preferred)
phone: 2-3514, or 5-0523, fax: 2-6444,
website: http://lasp.colorado.edu/~lix
• Office hours: 9:00-11:00 pm Wed at ECOT 534, Tue & Thu, after class.
• Read Chapter 1 & 2.
Energetic electrons and protons are not able to penetrate down to the Earth’s
surface directly. Particles gain entry through the cusps that are shaped like
funnels over the polar regions or they enter far downstream from the Earth.
Particles that enter downstream can be transported toward the Earth and
accelerated to high energies, producing auroras and radiation belts.
The Earth’s Magnetosphere
The flare was an ‘X-class’ and accompanied by one of the largestsolar energetic proton events ever recorded
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These protons reach Earth inless than 30 minutes
Less than 1 hour afterthe initial proton arrivalthe POLAR/VIS imageris saturated and remainsso for almost a day
Vis-proton-bastille
A Schematic View of the Locations of Radiation Belts
• Blue: inner belt, >100MeV protons, rather stable
• Purple: outer belt, 100s keV and MeV electrons and ions, not stable at all
• Slot region in between
• Yellow: ACRs, stable
• White line: Earth’s magnetic field, approx. by a dipole field
Charged Particle Motions in Earth’s Magnetic Field
• Gyromotion motion: =p2/2mB (1st), T_g~10-3 sec
• Bounce Motion: J= p||ds (2nd), T_b~100 sec • Drift motion: =BdA (3th) , T_d~103 sec
PARTICLE ENERGIES OF CONCERN
EVA
• EVAs - additional radiation exposure concern– Lower shielding– Eye dose– Skin dose
• 51.6 degrees, new concern for electron events– One area where we don’t currently have a good model. Have
limited measurements outside at our orbits during events from Shuttle and MIR, so we don’t have enough data for any kind of empirical model.
• 145 more EVAs are planned for ISS completion
The flare was an ‘X-class’ and accompanied by one of the largestsolar energetic proton events ever recorded
c3714
ISS ALTITUDE PROFILEInternational Space Station As Flown Altitude Profile
(Based on MCC-M/USSP Tracked SV Data)
320.0322.5325.0327.5330.0332.5335.0337.5340.0342.5345.0347.5350.0352.5355.0357.5360.0362.5365.0367.5370.0372.5375.0377.5380.0382.5385.0387.5390.0392.5395.0397.5400.0402.5405.0407.5410.0412.5415.0417.5420.0
11/17/98 01/16/99 03/17/99 05/16/99 07/15/99 09/13/99 11/12/99 01/11/00 03/11/00 05/10/00 07/09/00 09/07/00 11/06/00 01/05/01 03/06/01 05/05/01
Inv
aria
nt
Alt
. (km
) -
Ha,
Hp
, Hav
e
172.8174.1175.5176.8178.2179.5180.9182.2183.6184.9186.3187.6189.0190.3191.7193.0194.4195.7197.1198.4199.8201.1202.5203.8205.2206.5207.9209.2210.6211.9213.3214.6216.0217.3218.7220.0221.4222.7224.1225.4226.8
Inva
ria
nt
Alt
. (n
m)
ISS-2A1 (STS-096) Mated Reboost
ISS-2A.1 Reboost
ISS-2A2A (STS-101) Mated Reboost
ISS-1R (SM)- Rend Burns
ISS-1P (P251)- Test Burn
ISS-2A2B (STS-106) Mated Reboost
ISS-2A1 DAM
ISS-2A2B DAM
ISS-2A (STS-088) - Mated Reboost ISS-2A Test Burns
ISS-1AR Insertion
Burns
ISS-3A (STS-92) Mated Reboost
ISS-5A (STS-098) DAM
Mated Reboost
ISS-5A.1 (STS-102)
Mated Reboost
ISS-5A.1 3P Test
3P Reboost3P Phase
LEO GEO
Earth’s Debris Environment• Ground based radar and optical map > 1 cm below 2000 km
and > 10 cm above 2000 km• Shuttle surface and window damage for LEO• Need for smaller debris (<10 cm) map in most of space
National Space Weather Program To Advance
• observing capabilities• fundamental understanding of processes• data processing and analysis• numerical modeling transition of research into
operational techniques and algorithms• forecasting accuracy and reliability• space weather products and services• education on space weather
National Space Weather Program
To prevent or mitigate• under- or over-design of technical systems• regional blackouts of power utilities• early demise of multi-million dollar satellites • disruption of communications via satellite, HF, and
VHF radio• disruption of long-line telecommunications• errors in navigation systems• excessive radiation doses dangerous to human health
