mavpds-swia-momboard.xml
7.57 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
<?xml version="1.0" encoding="UTF-8"?>
<Spase xmlns="http://www.spase-group.org/data/schema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.spase-group.org/data/schema http://cdpp.irap.omp.eu/AMDA-NG/public/schemas/spase-amda-1_2_0.xsd">
<Version>2.2.6</Version>
<NumericalData>
<ResourceID>spase://CDPP/NumericalData/AMDA/MAVEN/SWIA/mavpds-swia-momboard</ResourceID>
<ResourceHeader>
<ResourceName>onboard ion moments</ResourceName>
<ReleaseDate>2015-10-12T10:48:29Z</ReleaseDate>
<Description>
Onboard Survey Moments - Ion density, temperature, and velocity moments
in physical units and coordinates calculated onboard from SWIA coarse or
fine data (depending on mode). These moments are computed under the assumption that all ions are protons,
and that the entire distribution is within the field of view and the energy range of the instrument.
</Description>
<Acknowledgement> Principal Investigator : Jasper Halekas, Univ. Iowa, Iowa City
</Acknowledgement>
<Contact>
<PersonID>spase://CDPP/Person/Jasper.S.Halekas</PersonID>
<Role>PrincipalInvestigator</Role>
</Contact>
<InformationURL>
<Name>SWIA web page, Summary sheet </Name>
<URL>http://lasp.colorado.edu/home/maven/science/instrument-package/swia/</URL>
<Description>
</Description>
</InformationURL>
</ResourceHeader>
<AccessInformation>
<RepositoryID>spase://SMWG/Repository/CDPP/AMDA</RepositoryID>
<Availability>Online</Availability>
<AccessRights>Open</AccessRights>
<AccessURL>
<Name>AMDA at CDPP</Name>
<URL>
http://amda.cdpp.eu
</URL>
</AccessURL>
<Format>Text.ASCII</Format>
<Acknowledgement> AMDA is a science analysis system provided by the Centre de Donnees de la
Physique des Plasmas (CDPP) supported by CNRS, CNES, Observatoire de Paris and
Universite Paul Sabatier, Toulouse
</Acknowledgement>
</AccessInformation>
<ProviderName>PDS</ProviderName>
<ProviderResourceName>/maven-swia-calibrated/onboard_svy_mom</ProviderResourceName>
<InstrumentID>spase://CDPP/Instrument/AMDA/MAVEN/SWIA</InstrumentID>
<MeasurementType>ThermalPlasma</MeasurementType>
<TemporalDescription>
<TimeSpan>
<StartDate>2014-03-19T14:19:43Z</StartDate>
<StopDate>2017-02-15T00:00:45Z</StopDate>
</TimeSpan>
<Cadence>PT4S</Cadence></TemporalDescription>
<ObservedRegion>Mars</ObservedRegion>
<Caveats> The moments are computed under the assumption that all ions are protons,
and that the entire distribution is within the field of view and the energy range of the instrument.
Meanwhile, there is no quality flag or correction for multi-ion issues.
Thus, SWIA moments data taken inside the induced magnetospheric boundary should typically not be used for quantitative purposes.
Even in the solar wind, which is ~94-97% protons, there are some values which cannot be used quantitatively, since the moments are computed over a distribution which includes not only the protons, but also ~3-6% alpha particles with twice the energy per charge. This has only a few percent effect on the density and velocity moments, so these values can safely be relied on, but even a small alpha population leads to an artificially large temperature moment (particularly the component aligned with the flow, which is often 2x or more higher than the true value).
Thus, the SWIA temperature moments cannot typically be used for quantitative purposes [for qualitative purposes they may be okay in the solar wind and magnetosheath].
Those wishing to look quantitatively at solar wind temperature should use the SWIA Level 2 3-d Fine data and use appropriate routines to separately compute proton and alpha temperature.
</Caveats>
<Parameter>
<Name>density</Name>
<ParameterKey>mav_swia_n</ParameterKey>
<Description/><Ucd>phys.density;phys.atmol.ionStage</Ucd>
<Units>cm-3</Units>
<UnitsConversion/>
<Particle>
<ParticleType>Ion</ParticleType>
<ParticleQuantity>NumberDensity</ParticleQuantity>
</Particle>
</Parameter>
<Parameter>
<Name>v_mso</Name>
<ParameterKey>mav_swia_vmso</ParameterKey>
<Description/>
<Ucd>phys.veloc;phys.atmol.ionStage</Ucd>
<Units>km/s</Units>
<UnitsConversion/>
<Structure>
<Size>3</Size>
<Element>
<Name>vx</Name>
<Qualifier>Component</Qualifier>
<Index>1</Index>
<ParameterKey>mav_swia_vmso(0)</ParameterKey>
<ValidMin/>
<ValidMax/>
<FillValue/>
</Element>
<Element>
<Name>vy</Name>
<Qualifier>Component</Qualifier>
<Index>2</Index>
<ParameterKey>mav_swia_vmso(1)</ParameterKey>
<ValidMin/>
<ValidMax/>
<FillValue/>
</Element>
<Element><Name>vz</Name>
<Qualifier>Component</Qualifier>
<Index>3</Index>
<ParameterKey>mav_swia_vmso(2)</ParameterKey>
<ValidMin/>
<ValidMax/>
<FillValue/>
</Element>
</Structure>
<Particle>
<ParticleType>Ion</ParticleType>
<ParticleQuantity>Velocity</ParticleQuantity>
</Particle>
</Parameter>
<Parameter>
<Name>|v|</Name>
<ParameterKey>mav_swia_vtot</ParameterKey>
<Description/>
<Ucd>phys.veloc;phys.atmol.ionStage</Ucd>
<Units>km/s</Units>
<UnitsConversion/>
<Particle>
<ParticleType>Ion</ParticleType>
<ParticleQuantity>Velocity</ParticleQuantity>
</Particle>
</Parameter>
<Parameter>
<Name>t_mso</Name><ParameterKey>mav_swia_tmso</ParameterKey>
<Description/>
<Ucd>phys.temperature;phys.atmol.Ionstage</Ucd>
<Units>eV</Units>
<UnitsConversion/>
<Structure>
<Size>3</Size>
<Element>
<Name>txx</Name>
<Qualifier>Component</Qualifier>
<Index>1</Index>
<ParameterKey>mav_swia_tmso(0)</ParameterKey>
<ValidMin/>
<ValidMax/>
<FillValue/>
</Element>
<Element>
<Name>tyy</Name>
<Qualifier>Component</Qualifier>
<Index>2</Index>
<ParameterKey>mav_swia_tmso(1)</ParameterKey>
<ValidMin/>
<ValidMax/>
<FillValue/>
</Element>
<Element>
<Name>tzz</Name>
<Qualifier>Component</Qualifier>
<Index>3</Index>
<ParameterKey>mav_swia_tmso(2)</ParameterKey>
<ValidMin/>
<ValidMax/>
<FillValue/>
</Element>
</Structure>
<Particle>
<ParticleType>Ion</ParticleType>
<ParticleQuantity>Temperature</ParticleQuantity>
</Particle>
</Parameter>
</NumericalData>
</Spase>