Differences between revisions 5 and 36 (spanning 31 versions)

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
image source

. 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

-  ⇤ ← Revision 5 as of 2019-03-31 02:52:05 → 
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  Editor: KeithLofstrom
  Comment:
+   ← Revision 36 as of 2019-09-19 06:21:40 → ⇥
  Size: 2535
  Editor: KeithLofstrom
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
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- . http://hitran.org keithl@keithl.com on kao3
 
 . https://www.sciencedirect.com/science/article/pii/0022407372900052
+-------
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-H density versus altitude:
+=== H density versus altitude ===
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-{{ attachment:geocoronaMarkup.png | | width=600 }}
+||<|16> {{ 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 ]] ||
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+Line 22:
-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 ]]:
+. https://www.sciencedirect.com/science/article/pii/0022407372900052
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+Line 24:
-||<-3> Cross section         ||
|| Gas  || (nm)² || (nm)² H₂ ||
+||<-12> 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 ||
-Line 23:
+Line 45:
+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

Diff for "GasScatter"

Propellant Plume Gas Scattering

H density versus altitude

Collision cross section table