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MMS 1 Active Spacecraft Potential Control, Sensors 1 and 2 (ASPOC) Level 2, Quick-Look Survey

ResourceID
spase://NASA/NumericalData/MMS/1/ASPOC/Survey/Level2/PT1S

Description

MMS 1 Active Spacecraft Potential Control (ASPOC) - Sensors 1 and 2 Ion Beam Current Rates, Beam Energies, and Instrument Status variables. In tenuous plasma regions, the floating potential of a sunlit spacecraft is positively charged, reaching up to tens of Volts. The corresponding electric field disturbs the ambient plasma measurements obtained from electron and ion sensors and the large fluxes of attracted photo-electrons can significantly reduce the lifetime of the micro-channel plate. The electric field measurements can be also contaminated by the high spacecraft potential values. The Active Spacecraft Potential Control neutralizes the spacecraft potential by releasing positively charged Indium ions. The ASPOCs neutralize the electrical potential of the spacecraft, limiting or eliminating spurious electric fields that can contaminate measurements. This allows observations of the more scientifically important low-energy ions and electrons.

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Details

Version:2.3.2

NumericalData

ResourceID
spase://NASA/NumericalData/MMS/1/ASPOC/Survey/Level2/PT1S
ResourceHeader
ResourceName
MMS 1 Active Spacecraft Potential Control, Sensors 1 and 2 (ASPOC) Level 2, Quick-Look Survey
ReleaseDate
2021-04-27 15:38:11Z
Description

MMS 1 Active Spacecraft Potential Control (ASPOC) - Sensors 1 and 2 Ion Beam Current Rates, Beam Energies, and Instrument Status variables. In tenuous plasma regions, the floating potential of a sunlit spacecraft is positively charged, reaching up to tens of Volts. The corresponding electric field disturbs the ambient plasma measurements obtained from electron and ion sensors and the large fluxes of attracted photo-electrons can significantly reduce the lifetime of the micro-channel plate. The electric field measurements can be also contaminated by the high spacecraft potential values. The Active Spacecraft Potential Control neutralizes the spacecraft potential by releasing positively charged Indium ions. The ASPOCs neutralize the electrical potential of the spacecraft, limiting or eliminating spurious electric fields that can contaminate measurements. This allows observations of the more scientifically important low-energy ions and electrons.

Acknowledgement
K. Torkar, R. Nakamura, Refer to Institut fur Weltraumforschung (IWF), Osterreichische Akademie der Wissenschaften (OAW) for rules of acknowledgement
Contacts
RolePerson
1.PrincipalInvestigatorspase://SMWG/Person/Klaus.M.Torkar
2.PrincipalInvestigatorspase://SMWG/Person/Rumi.Nakamura
3.MetadataContactspase://SMWG/Person/Robert.E.McGuire
4.MetadataContactspase://SMWG/Person/Lee.Frost.Bargatze
InformationURL
Name
The Magnetospheric Multiscale (MMS) Mission home page at Goddard Space Flight Center (GSFC)
URL
Description

The Magnetospheric Multiscale (MMS) Mission Home Page hosted by the Goddard Space Flight Center (GSFC).

InformationURL
Name
Data Caveats and Current Release Notes at LASP MMS SDC
URL
Description

The Magnetospheric Multiscale (MMS) Mission home page hosted by the Laboratory of Atmospheric and Space Physics, Science Data Center (LASP, SDC) at the University of Colorado, Boulder.

InformationURL
Name
The MMS Graz ASPOC Team home page at IWF, OAW
URL
Description

The Magnetospheric Multiscale (MMS) ASPOC home page hosted by the Graz ASPOC team located at the Institut fur Weltraumforschung (IWF), Osterreichische Akademie der Wissenschaften (OAW).

PriorIDs
spase://VSPO/NumericalData/MMS/1/ASPOC/Survey/Level2/PT1S
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description

In CDF via ftp from SPDF.

AccessURL
Name
HTTPS from SPDF
URL
Description

In CDF via http from SPDF.

AccessURL
Name
CDAWeb
URL
ProductKey
MMS1_ASPOC_SRVY_L2
Description

Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb

Format
CDF
Encoding
None
Acknowledgement
K. Torkar, R. Nakamura, Refer to Institut fur Weltraumforschung (IWF), Osterreichische Akademie der Wissenschaften (OAW) for rules of acknowledgement. Please acknowledge the data providers and CDAWeb when using these data.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
MMS1_ASPOC_SRVY_L2
Description

Web Service to this product using the HAPI interface.

Format
CSV
Acknowledgement
K. Torkar, R. Nakamura, Refer to Institut fur Weltraumforschung (IWF), Osterreichische Akademie der Wissenschaften (OAW) for rules of acknowledgement. Please acknowledge the data providers and CDAWeb when using these data.
ProcessingLevel
Calibrated
InstrumentIDs
MeasurementType
InstrumentStatus
TemporalDescription
TimeSpan
StartDate
2015-04-16 00:00:00.000
RelativeStopDate
-P2M
Cadence
PT1S
ObservedRegion
Earth.Magnetosheath
ObservedRegion
Earth.Magnetosphere
ObservedRegion
Earth.Magnetosphere.Magnetotail
ObservedRegion
Earth.Magnetosphere.Main
ObservedRegion
Earth.Magnetosphere.RadiationBelt
ObservedRegion
Earth.NearSurface.EquatorialRegion
ObservedRegion
Earth.NearSurface.Plasmasphere
ObservedRegion
Heliosphere.NearEarth
Parameter #1
Name
Epoch
ParameterKey
Epoch
Description

Interval centered time tag rounded to nearest msecond

Caveats
This parameter exhibits an increasing monotonic progression.
Cadence
PT1S
Units
ns
UnitsConversion
1.0e-9>s
RenderingHints
DisplayType
TimeSeries
AxisLabel
Epoch
ScaleMin
6.2798349819904e+13
ScaleMax
6.6269642620904e+13
ScaleType
LinearScale
ValidMin
1990-01-01T00:00:00.000000000
ValidMax
2100-01-01T00:00:01.000000000
FillValue
9999-12-31T23:59:59.999999999
Support
SupportQuantity
Temporal
Parameter #2
Name
Beam Current Sum
Set
Time series defined by using: EPOCH
ParameterKey
mms1_aspoc_ionc
Description

ASPOC Ion Emission Current Sum

Cadence
PT1S
Units
uA
UnitsConversion
1.0e-6>A
RenderingHints
DisplayType
TimeSeries
AxisLabel
I_ion
ValueFormat
f5.1
ScaleMin
0.0
ScaleMax
100.0
ScaleType
LinearScale
ValidMin
0.0
ValidMax
100.0
FillValue
-1.0e+31
Particle
ParticleType
Ion
Qualifier
Median
ParticleQuantity
CountRate
Parameter #3
Name
Beam Current, Unit 1
Set
Time series defined by using: EPOCH
ParameterKey
mms1_asp1_ionc
Description

ASPOC Unit 1 Ion Emission Current

Cadence
PT1S
Units
uA
UnitsConversion
1.0e-6>A
RenderingHints
DisplayType
TimeSeries
AxisLabel
I_ion
ValueFormat
f5.1
ScaleMin
0.0
ScaleMax
100.0
ScaleType
LinearScale
ValidMin
0.0
ValidMax
100.0
FillValue
-1.0e+31
Particle
ParticleType
Ion
Qualifier
Median
ParticleQuantity
CountRate
Parameter #4
Name
Beam Current, Unit 2
Set
Time series defined by using: EPOCH
ParameterKey
mms1_asp2_ionc
Description

ASPOC Unit 2 Ion Emission Current

Cadence
PT1S
Units
uA
UnitsConversion
1.0e-6>A
RenderingHints
DisplayType
TimeSeries
AxisLabel
I_ion
ValueFormat
f5.1
ScaleMin
0.0
ScaleMax
100.0
ScaleType
LinearScale
ValidMin
0.0
ValidMax
100.0
FillValue
-1.0e+31
Particle
ParticleType
Ion
Qualifier
Median
ParticleQuantity
CountRate
Parameter #5
Name
Beam Energy, Unit 1
Set
Time series defined by using: EPOCH
ParameterKey
mms1_asp1_energy
Description

ASPOC Unit 1 Emitted Beam Energy

Cadence
PT1S
Units
kV
UnitsConversion
1.0e3>V
RenderingHints
DisplayType
TimeSeries
AxisLabel
Energy
ValueFormat
f5.2
ScaleMin
0.0
ScaleMax
12.5
ScaleType
LinearScale
ValidMin
0.0
ValidMax
12.5
FillValue
-1.0e+31
Particle
ParticleType
Ion
Qualifier
Median
ParticleQuantity
Energy
Parameter #6
Name
Beam Energy, Unit 2
Set
Time series defined by using: EPOCH
ParameterKey
mms1_asp2_energy
Description

ASPOC Unit 2 Emitted Beam Energy

Cadence
PT1S
Units
kV
UnitsConversion
1.0e3>V
RenderingHints
DisplayType
TimeSeries
AxisLabel
Energy
ValueFormat
f5.2
ScaleMin
0.0
ScaleMax
12.5
ScaleType
LinearScale
ValidMin
0.0
ValidMax
12.5
FillValue
-1.0e+31
Particle
ParticleType
Ion
Qualifier
Median
ParticleQuantity
Energy
Parameter #7
Name
Instrument Status
Set
Time series defined by using: EPOCH
ParameterKey
mms1_aspoc_status
Description

ASPOC Instrument Status

Cadence
PT1S
RenderingHints
DisplayType
TimeSeries
ValueFormat
i3
ScaleType
LinearScale
Structure
Size
4
Element
Name
Data Quality
Index
1
RenderingHints
AxisLabel
Data Quality
Element
Name
Unit 1 Mode
Index
2
RenderingHints
AxisLabel
Unit 1 Mode
Element
Name
Unit 2 Mode
Index
3
RenderingHints
AxisLabel
Unit 2 Mode
Element
Name
On/Off Status
Index
4
RenderingHints
AxisLabel
On/Off Status
ValidMin
0
ValidMax
254
FillValue
255
Support
SupportQuantity
InstrumentMode
Parameter #8
Name
Half Interval
ParameterKey
mms1_aspoc_var
Description

Half width of measurement interval

Cadence
PT1S
Units
ns
UnitsConversion
1.0e-9>s
RenderingHints
AxisLabel
Half_int
ValueFormat
f13.1
ValidMin
0.0
ValidMax
1.275e+10
Support
SupportQuantity
Temporal