Global modeling of comets: nucleus, neutral and ionized coma of comets 67P/Churyumov-Gerasimenko and 46P/Wirtanen: preparations for the Rosetta radio science investigations
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| Main Author: | |
|---|---|
| Format: | Book |
| Language: | English |
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Köln
Inst. für Geophysik und Meteorologie
2003
|
| Series: | Mitteilungen aus dem Institut für Geophysik und Meteorologie der Universität zu Köln
156 |
| Subjects: | |
| Online Access: | Inhaltsverzeichnis |
| Item Description: | Zugl.: Köln, Univ., Diss., 2003 |
| Physical Description: | VI, 142 S. graph. Darst. |
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| 245 | 1 | 0 | |a Global modeling of comets: nucleus, neutral and ionized coma of comets 67P/Churyumov-Gerasimenko and 46P/Wirtanen |b preparations for the Rosetta radio science investigations |c Jörg von Oertzen |
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CONTENTS
1
INTRODUCTION
1
1.1
KURZZUSAMMENFASSUNG
.
1
1.2
ABSTRACT
.
3
1.3
MOTIVATION
.
4
1.4
COMETARY
MISSIONS
.
5
2
THE
R
OSETTA
MISSION
'
7
2.1
THE
R
OSETTA
SPACECRAFT
.
7
2.2
RADIO
SCIENCE
INVESTIGATIONS
.
8
2.2.1
SCIENTIFIC
OBJECTIVES
.
8
2.2.2
RADIO
SUBSYSTEM
.
8
2.3
OTHER
EXPERIMENTS
.
9
3
POSSIBLE
TARGET
COMETS
11
3.1
46P/WIRTANEN
.
11
3.2
67P/CHURYUMOV-GERASIMENKO
.
11
3.3
ORBITAL
ELEMENTS
.
12
3.4
TIMELINE
AND
GEOMETRIC
CONSIDERATIONS
.
12
4
THERMAL
MODEL
OF
A
COMETARY
NUCLEUS
15
II
_
4.1
INTRODUCTION
.
15
4.2
THE
COMETARY
NUCLEUS
.
16
4.2.1
OBSERVATIONS
OF
COMETARY
NUCLEI
.
16
4.2.2
STRUCTURE
.
16
4.2.3
COMPOSITION
.
17
4.2.4
ALBEDO
.
19
4.2.5
THERMAL
SKIN
DEPTH
.
19
4.2.6 HEAT
AND
GAS
DIFFUSION
MODELS
.
21
4.3
THERMAL
MODEL
OF
A
COMETARY
NUCLEUS
.
22
4.3.1
ENERGY
AND
MASS
CONSERVATION
IN
A
POROUS
MEDIUM
.
23
4.3.2
SUBLIMATION
RATE
.
24
4.3.3
THERMAL
CONDUCTIVITY
AND
GAS
FLUX
.
26
4.3.4
BOUNDARY
CONDITIONS
.
28
4.3.5
NUMERICAL
SCHEME
.
30
4.4
PHYSICAL
PARAMETERS
.
30
4.5
CALIBRATION
AND
RESULTS
.
,
.
32
5
THE
NEUTRAL
COMA
43
5.1
INTRODUCTION
.
43
5.1.1
COMPOSITION
OF
THE
COMA
.
45
5.1.2
MODELS
OF
THE
COMETARY
COMA
.
46
5.2
HYDRODYNAMIC
SIMULATION
OF
THE
NEUTRAL
COMA
.
47
5.2.1
HYDRODYNAMIC
APPROXIMATION
.
47
5.2.2
THE
Z
EUS
CODE
.
48
5.2.3
BOUNDARY
CONDITIONS
.
49
5.2.4
NON-GRAVITATIONAL
FORCES
ACTING
ON
ROSETTA
.
50
5.3
RESULTS
.
52
5.3.1
CASE
1:
FYO
SUBLIMATION
AT
3
AU,
67P/C-G
.
52
5.3.2
CASE
2:
STRONG
SUBLIMATION
AT
2
AU,
46P/WIRTANEN
.
58
5.3.3
CONSEQUENCES
FOR
RSI
.
62
5.3.4
DISCUSSION
.
63
CONTENTS
III
6
IONIZED
COMA
AND
INTERACTION
WITH
THE
SOLAR
WIND
65
6.1
INTRODUCTION
.
65
6.2
SOLAR
WIND
PARAMETERS
.
67
6.3
SOLAR
ACTIVITY
&
PREDICTIONS
.
69
6.4
COMETARY
PLASMA
.
72
6.4.1
SOLAR
UV
SPECTRUM
.
72
6.4.2
OPTICAL
DEPTH
OF
THE
COMA
IN
THE
UV
RANGE
.
74
6.4.3
PHOTOIONIZATION
AND
PHOTODISSOCIATION
.
76
6.4.4
IMPACT
IONIZATION
AND
CHARGE
EXCHANGE
.
77
6.4.5
TOTAL
IONIZATION
FREQUENCY
.
79
6.4.6
ION-MOLECULE
REACTIONS
.
79
6.4.7
RECOMBINATION
.
79
6.4.8
ELECTRON
TEMPERATURE
.
80
6.4.9
THERMAL
ELECTRON
COLLISIONOPAUSE
.
82
6.5
STATIONARY
PLASMA
MODEL
ID
.
84
6.5.1
CASE
1:
WITH
ASSUMPTION
OF
PHOTOCHEMICAL
EQUILIBRIUM
.
84
6.5.2
CASE
2:
NUMERICAL
SOLUTION
OF
THE
ID
CONTINUITY
EQUATION
.
87
6.5.3
CONCLUSIONS
.
88
6.6
INTERACTION
WITH
THE
SOLAR
WIND
.
89
6.6.1
COMETARY
PICK-UP
IONS
IN
THE
SOLAR
WIND
.
90
6.6.2
BOW
SHOCK
/
BOW
WAVE
.
91
6.6.3
COLLISIONOPAUSE
AND
MAGNETIC
PILE-UP
BOUNDARY
.
92
6.6.4
CAVITY
SURFACE
I
LONOPAUSE
.
94
6.6.5
RESULTS
FOR
67P/CHURYUMOV-GERASIMENKO
AND
46P/WIRTANEN
.
96
6.7
TRANSIENT
SOLAR
EVENTS
.
98
6.7.1
SOLAR
FLARES
.
98
6.7.2
CORONAL
MASS
EJECTIONS
.
99
6.7.3
POSSIBLE
EFFECTS
ON
RADIO
SCIENCE
.
99
7
DISCUSSION
AND
OUTLOOK
103
8
ZUSAMMENFASSUNG
107
IV
A
PHYSICAL
CONSTANTS
113
B
FINITE
DIFFERENCE
SCHEME
FOR
THE
HEAT
DIFFUSION
EQUATION
114
C
THE
THERMAL
MODEL
APPLIED
TO
IP/HALLEY
115
D
ADDITIONAL
RESULTS
OF
THE
COMA
MODEL
117
D.L
67P/CHURYUMOV-GERASIMENKO
AT
1.3
AU
.
117
D.2
46P/WIRTANEN
AT
1.1
AU
.
121
E
OBSERVATIONAL
GEOMETRY
FOR
67P/CHURYUMOV-GERASIMENKO
125
DANKSAGUNG
143
ERKLARUNG
145 |
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| series2 | Mitteilungen aus dem Institut für Geophysik und Meteorologie der Universität zu Köln |
| spelling | Oertzen, Jörg von Verfasser aut Global modeling of comets: nucleus, neutral and ionized coma of comets 67P/Churyumov-Gerasimenko and 46P/Wirtanen preparations for the Rosetta radio science investigations Jörg von Oertzen Köln Inst. für Geophysik und Meteorologie 2003 VI, 142 S. graph. Darst. txt rdacontent n rdamedia nc rdacarrier Mitteilungen aus dem Institut für Geophysik und Meteorologie der Universität zu Köln 156 Zugl.: Köln, Univ., Diss., 2003 Rosetta Raumsonde (DE-588)4706601-5 gnd rswk-swf Modell (DE-588)4039798-1 gnd rswk-swf Komet (DE-588)4031833-3 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Komet (DE-588)4031833-3 s Modell (DE-588)4039798-1 s Rosetta Raumsonde (DE-588)4706601-5 s DE-604 Mitteilungen aus dem Institut für Geophysik und Meteorologie der Universität zu Köln 156 (DE-604)BV000005283 156 DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=012994444&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Oertzen, Jörg von Global modeling of comets: nucleus, neutral and ionized coma of comets 67P/Churyumov-Gerasimenko and 46P/Wirtanen preparations for the Rosetta radio science investigations Mitteilungen aus dem Institut für Geophysik und Meteorologie der Universität zu Köln Rosetta Raumsonde (DE-588)4706601-5 gnd Modell (DE-588)4039798-1 gnd Komet (DE-588)4031833-3 gnd |
| subject_GND | (DE-588)4706601-5 (DE-588)4039798-1 (DE-588)4031833-3 (DE-588)4113937-9 |
| title | Global modeling of comets: nucleus, neutral and ionized coma of comets 67P/Churyumov-Gerasimenko and 46P/Wirtanen preparations for the Rosetta radio science investigations |
| title_auth | Global modeling of comets: nucleus, neutral and ionized coma of comets 67P/Churyumov-Gerasimenko and 46P/Wirtanen preparations for the Rosetta radio science investigations |
| title_exact_search | Global modeling of comets: nucleus, neutral and ionized coma of comets 67P/Churyumov-Gerasimenko and 46P/Wirtanen preparations for the Rosetta radio science investigations |
| title_full | Global modeling of comets: nucleus, neutral and ionized coma of comets 67P/Churyumov-Gerasimenko and 46P/Wirtanen preparations for the Rosetta radio science investigations Jörg von Oertzen |
| title_fullStr | Global modeling of comets: nucleus, neutral and ionized coma of comets 67P/Churyumov-Gerasimenko and 46P/Wirtanen preparations for the Rosetta radio science investigations Jörg von Oertzen |
| title_full_unstemmed | Global modeling of comets: nucleus, neutral and ionized coma of comets 67P/Churyumov-Gerasimenko and 46P/Wirtanen preparations for the Rosetta radio science investigations Jörg von Oertzen |
| title_short | Global modeling of comets: nucleus, neutral and ionized coma of comets 67P/Churyumov-Gerasimenko and 46P/Wirtanen |
| title_sort | global modeling of comets nucleus neutral and ionized coma of comets 67p churyumov gerasimenko and 46p wirtanen preparations for the rosetta radio science investigations |
| title_sub | preparations for the Rosetta radio science investigations |
| topic | Rosetta Raumsonde (DE-588)4706601-5 gnd Modell (DE-588)4039798-1 gnd Komet (DE-588)4031833-3 gnd |
| topic_facet | Rosetta Raumsonde Modell Komet Hochschulschrift |
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| volume_link | (DE-604)BV000005283 |
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