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| . http://hitran.org keithl@keithl.com on kao3 . https://www.sciencedirect.com/science/article/pii/0022407372900052 |
------- === H density versus altitude === ||<|14> {{ attachment:geocoronaMarkup.png | | width=600 }} ||<)> '''alt km''' ||<)> '''radius km''' ||<)> '''#/m3''' || ||<)> 1000 ||<)> 7378 ||<)> 21000e6 || ||<)> 2000 ||<)> 8378 ||<)> 12000e6 || Constr. perigee || ||<)> 5000 ||<)> 11378 ||<)> 3100e6 || ||<)> 10000 ||<)> 16378 ||<)> 820e6 || ||<)> 20000 ||<)> 26378 ||<)> 180e6 || ||<)> 30000 ||<)> 36378 ||<)> 67e6 || ||<)> 35786 ||<)> 42164 ||<)> 45e6 || GEO circular || ||<)> 40000 ||<)> 46378 ||<)> 35e6 || ||<)> 50000 ||<)> 56378 ||<)> 22e6 || ||<)> 60000 ||<)> 66378 ||<)> 14e6 || ||<)> 69572 ||<)> 75950 ||<)> 11e6 || Constr. apogee || ||<)> 70000 ||<)> 76378 ||<)> 10e6 || ||<-3> [[attachment:geocoronaMarkup.png | image source ]] || . https://www.sciencedirect.com/science/article/pii/0022407372900052 ||<-10> Estimated hydrogen mass per 1000 km height, 1.67e-27kg/H || || Altitude km || 1000 || 2000 || 10000 || 20000 || 30000 || 35786* || 40000 || 50000 || 60000 || 69572* || 70000 || || Radius km || 7378 || 11378 || 16378 || 26378 || 36378 || 42164* || 46378 || 56378 || 66378 || 75950* || 76378 || || Volume km³ || 6.8e11 || 1.6e12 || 3.4e12 || 8.7e12 || 1.7e13 || 2.2e13 || 2.7e13 || 4.0e13 || 5.5e13 || 7.2e13 || 7.3e13 || || #H / m³ || 2.1e10 || 1.2e10 || 3.1e9 || 8.2e8 || 1.8e8 || 6.7e7 || 4.5e7 || 3.5e7 || 1.4e7 || 1.1e7 || 1.0e7 || || H kg || 24000 || 32000 || 18000 || 12000 || 5100 || 2500* || 2300 || 2300 || 1300 || 1300* || 1200 || Less than 20 tonnes of hydrogen (and almost nothing else) above GEO, out to the bow shock. === Collision cross section table === || Gas || (nm)² || (nm)² with H₂ || || H₂ || 0.27 || 1.02 || || He || 0.21 || 0.99 || || Ar || 0.36 || 1.06 || || O₂ || 0.40 || 1.07 || || N₂ || 0.43 || 1.08 || || CH₄ || 0.46 || 1.09 || || CO₂ || 0.52 || 1.11 || || Cl₂ || 0.93 || 1.22 || The second column is the combined collision cross section with an H₂ molecule ... the square of the sum of the square roots. from [[ https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Kinetics/Modeling_Reaction_Kinetics/Collision_Theory/Collisional_Cross_Section | libretexts ]] ----- . http://hitran.org . . . . . . . . . k*l at k*l dot com on kao3 |
Propellant Plume Gas Scattering
H density versus altitude
|
alt km |
radius km |
#/m3 |
1000 |
7378 |
21000e6 |
|
2000 |
8378 |
12000e6 |
Constr. perigee |
5000 |
11378 |
3100e6 |
|
10000 |
16378 |
820e6 |
|
20000 |
26378 |
180e6 |
|
30000 |
36378 |
67e6 |
|
35786 |
42164 |
45e6 |
GEO circular |
40000 |
46378 |
35e6 |
|
50000 |
56378 |
22e6 |
|
60000 |
66378 |
14e6 |
|
69572 |
75950 |
11e6 |
Constr. apogee |
70000 |
76378 |
10e6 |
|
. https://www.sciencedirect.com/science/article/pii/0022407372900052
Estimated hydrogen mass per 1000 km height, 1.67e-27kg/H |
|||||||||||
Altitude km |
1000 |
2000 |
10000 |
20000 |
30000 |
35786* |
40000 |
50000 |
60000 |
69572* |
70000 |
Radius km |
7378 |
11378 |
16378 |
26378 |
36378 |
42164* |
46378 |
56378 |
66378 |
75950* |
76378 |
Volume km³ |
6.8e11 |
1.6e12 |
3.4e12 |
8.7e12 |
1.7e13 |
2.2e13 |
2.7e13 |
4.0e13 |
5.5e13 |
7.2e13 |
7.3e13 |
#H / m³ |
2.1e10 |
1.2e10 |
3.1e9 |
8.2e8 |
1.8e8 |
6.7e7 |
4.5e7 |
3.5e7 |
1.4e7 |
1.1e7 |
1.0e7 |
H kg |
24000 |
32000 |
18000 |
12000 |
5100 |
2500* |
2300 |
2300 |
1300 |
1300* |
1200 |
Less than 20 tonnes of hydrogen (and almost nothing else) above GEO, out to the bow shock.
Collision cross section table
Gas |
(nm)² |
(nm)² with H₂ |
H₂ |
0.27 |
1.02 |
He |
0.21 |
0.99 |
Ar |
0.36 |
1.06 |
O₂ |
0.40 |
1.07 |
N₂ |
0.43 |
1.08 |
CH₄ |
0.46 |
1.09 |
CO₂ |
0.52 |
1.11 |
Cl₂ |
0.93 |
1.22 |
The second column is the combined collision cross section with an H₂ molecule ... the square of the sum of the square roots.
from libretexts
http://hitran.org . . . . . . . . . k*l at k*l dot com on kao3