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ACE Solar Wind Electron Proton Alpha Monitor (SWEPAM) 64-Second Level 2 Data

ResourceID
spase://NASA/NumericalData/ACE/SWEPAM/L2/PT64S

Description

Solar Wind Ion parameters from ACE/SWEPAM. Level 2 data, 64-second averages. Parameters include proton density, temperature (radial component) and flow speed, flow velocity vector in GSE, GSM and RTN coordinates, and alpha to proton density ratio. ACE position vectors in GSE and GSM are included. The data are accessible via ftp in HDF and CDF from the ACE Science Center and CDAWeb, respectively, and in ASCII format from the value-added interfaces at those sites. Hourly averaged L2 plasma parameters are also available from these access paths. The "parameter keys" given below are as used by CDAWeb.

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Details

Version:2.2.9

NumericalData

ResourceID
spase://NASA/NumericalData/ACE/SWEPAM/L2/PT64S
ResourceHeader
ResourceName
ACE Solar Wind Electron Proton Alpha Monitor (SWEPAM) 64-Second Level 2 Data
ReleaseDate
2020-07-07 21:14:15Z
Description

Solar Wind Ion parameters from ACE/SWEPAM. Level 2 data, 64-second averages. Parameters include proton density, temperature (radial component) and flow speed, flow velocity vector in GSE, GSM and RTN coordinates, and alpha to proton density ratio. ACE position vectors in GSE and GSM are included. The data are accessible via ftp in HDF and CDF from the ACE Science Center and CDAWeb, respectively, and in ASCII format from the value-added interfaces at those sites. Hourly averaged L2 plasma parameters are also available from these access paths. The "parameter keys" given below are as used by CDAWeb.

Acknowledgement
Please acknowledge the ACE/SWEPAM instrument team and the ACE Science Center
Contacts
RolePerson
1.TechnicalContactspase://SMWG/Person/Ruth.Skoug
2.PrincipalInvestigatorspase://SMWG/Person/David.J.McComas
InformationURL
Name
ACE SWEPAM Level 2 data Home Page
URL
http://www.srl.caltech.edu/ACE/ASC/level2/swepam_l2desc.html
Description

ACE Science Center site hosting instrument information, data release notes, as well as web utilities for plotting and downloading data

InformationURL
Name
Rules of use, and caveats
URL
http://www.srl.caltech.edu/ACE/ASC/level2/policy_lvl2.html
Description

ACE level 2 data rules of use, and caveats

PriorIDs
spase://VHO/NumericalData/ACE/SWEPAM/L2_PT64S
spase://VSPO/NumericalData/ACE/SWEPAM/L2/PT64S
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
ftps://spdf.gsfc.nasa.gov/pub/data/ace/swepam/level_2_cdaweb/swe_h0/
Description

FTP repository of 64-second ACE SWEPAM data in CDF format at CDAWeb

AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/ace/swepam/level_2_cdaweb/swe_h0/
Description

In CDF via HTTP from SPDF

Format
CDF
Acknowledgement
Please acknowledge the ACE/SWEPAM instrument team, the ACE Science Center, and the CDAWeb team at GSFC/SPDF.
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb
URL
https://cdaweb.sci.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=AC_H0_SWE&index=sp_phys
ProductKey
AC_H0_SWE
Description

ACE/SWEPAM L2 64-sec data with subset, plot, list functionalities from CDAWeb

Format
Text
Acknowledgement
Please acknowledge the ACE/SWEPAM instrument team, the ACE Science Center, and the CDAWeb team at GSFC/SPDF.
AccessInformation
RepositoryID
spase://SMWG/Repository/ACE_SC
Availability
Online
AccessRights
Open
AccessURL
Name
ACE Science Center ftp area
URL
ftp://mussel.srl.caltech.edu/pub/ace/level2/swepam/
Description

In HDF via ftp from ACE Science Center

Format
HDF
Acknowledgement
Please acknowledge the ACE/SWEPAM instrument team and the ACE Science Center
AccessInformation
RepositoryID
spase://SMWG/Repository/ACE_SC
Availability
Online
AccessRights
Open
AccessURL
Name
ACE Science Center
URL
http://www.srl.caltech.edu/ACE/ASC/level2/lvl2DATA_SWEPAM.html
Description

ACE/SWEPAM L2 64-sec data with subset, plot, list functionalities from the ACE Science Center

Format
Text
Acknowledgement
Please acknowledge the ACE/SWEPAM instrument team and the ACE Science Center
ProviderResourceName
ACE SWEPAM Level 2 Data, 64-second averages
ProviderProcessingLevel
Level 2
ProviderVersion
9
InstrumentIDs
spase://SMWG/Instrument/ACE/SWEPAM
MeasurementType
ThermalPlasma
TemporalDescription
TimeSpan
StartDate
1998-02-04 00:00:12Z
RelativeStopDate
-P2M
Cadence
PT64S
ObservedRegion
Heliosphere.NearEarth
Caveats
The quality of ACE level 2 data is such that it is suitable for serious scientific study. However, to avoid confusion and misunderstanding, it is recommended that users consult with the appropriate ACE team members before publishing work derived from the data. The ACE team has worked hard to ensure that the level 2 data are free from errors, but the team cannot accept responsibility for erroneous data, or for misunderstandings about how the data may be used. This is especially true if the appropriate ACE team members are not consulted before publication. At the very least, preprints should be forwarded to the ACE team before publication.
Parameter #1
Name
Time
ParameterKey
Epoch
Description

Number of milliseconds since CDF_EPOCH: 0000-01-01T00:00:00.000. Timestamp marks beginning of interval

Units
ms
UnitsConversion
1e-3>s
ValidMin
1996-01-01T00:00:00.000Z
ValidMax
2020-01-01T00:00:00.000Z
FillValue
-1.0E31
Support
SupportQuantity
Temporal
Parameter #2
Name
Time PB5
ParameterKey
Time_PB5
Description

Time of observation in year, day of year, and milliseconds. Timestamp marks beginning of interval

Structure
Size
3
Element
Name
Year
Index
1
Units
year
ValidMin
1997
ValidMax
2020
FillValue
-2147483648
Element
Name
Day of year
Index
2
Units
day
ValidMin
1
ValidMax
366
FillValue
-2147483648
Element
Name
Elapsed milliseconds of day
Index
3
Units
msec
ValidMin
0
ValidMax
86401000
FillValue
-2147483648
Support
SupportQuantity
Temporal
Parameter #3
Name
Proton Number density
ParameterKey
Np
Description

Solar Wind Proton Number Density, scalar

Caveats
Np is the proton number density in units of cm-3, as calculated by integrating the ion distribution function.
Units
cm^-3
ValidMin
0.0
ValidMax
200.0
FillValue
-1.0E31
Particle
ParticleType
Proton
Qualifier
Moment
ParticleQuantity
NumberDensity
Parameter #4
Name
Solar Wind Proton Speed
ParameterKey
Vp
Description

Solar Wind Bulk Speed

Caveats
Vp is the solar wind proton speed, or more generally just the solar wind (bulk) speed. It is obtained by integrating the ion (proton) distribution function.
Units
km/s
ValidMin
0.0
ValidMax
2500.0
FillValue
-1.0E31
Particle
ParticleType
Proton
Qualifier
Moment
Qualifier
Scalar
ParticleQuantity
Velocity
Parameter #5
Name
Proton Temperature
ParameterKey
Tpr
Description

radial component of the proton temperature

Caveats
The radial component of the proton temperature is the (1,1) component of the temperature tensor, along the radial direction. It is obtained by integration of the ion (proton) distribution function.
Units
Kelvin
ValidMin
1000.0
ValidMax
1100000.0
FillValue
-1.0E31
Particle
ParticleType
Proton
Qualifier
Moment
ParticleQuantity
Temperature
Parameter #6
Name
alpha/proton ratio
ParameterKey
alpha_ratio
Description

alpha to proton density ratio

Caveats
Alpha ratio (Na/Np) - is the ratio of the number density of helium++ ions to the number density of protons.
ValidMin
0.0
ValidMax
10.0
FillValue
-1.0E31
Particle
ParticleType
AlphaParticle
ParticleType
Proton
Qualifier
Ratio
ParticleQuantity
NumberDensity
Parameter #7
Name
Solar Wind Velocity (GSE)
ParameterKey
V_GSE
Description

Solar Wind Velocity in GSE cartesian coordinates, 64-second average

Caveats
Solar Wind Velocity in GSE coords, 64-second average
Units
km/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
3
Element
Name
VX (GSE)
Qualifier
Component.I
Index
1
ValidMin
-2000.0
ValidMax
0.0
FillValue
-1.0E31
Element
Name
VY (GSE)
Qualifier
Component.J
Index
2
ValidMin
-900.0
ValidMax
900.0
FillValue
-1.0E31
Element
Name
VZ (GSE)
Qualifier
Component.K
Index
3
ValidMin
-900.0
ValidMax
900.0
FillValue
-1.0E31
Particle
ParticleType
Proton
Qualifier
Moment
Qualifier
Vector
ParticleQuantity
Velocity
Parameter #8
Name
Solar Wind Velocity (RTN)
ParameterKey
V_RTN
Description

Solar Wind Velocity in RTN cartesian coordinates, 64-second average

Caveats
Solar Wind Velocity in RTN cartesian coordinates, 64-second average
Units
km/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
RTN
Structure
Size
3
Element
Name
VR (RTN)
Qualifier
Component.I
Index
1
ValidMin
0.0
ValidMax
2000.0
FillValue
-1.0E31
Element
Name
VT (RTN)
Qualifier
Component.J
Index
2
ValidMin
-900.0
ValidMax
900.0
FillValue
-1.0E31
Element
Name
VN (RTN)
Qualifier
Component.K
Index
3
ValidMin
-900.0
ValidMax
900.0
FillValue
-1.0E31
Particle
ParticleType
Proton
Qualifier
Moment
Qualifier
Vector
ParticleQuantity
Velocity
Parameter #9
Name
Solar Wind Velocity (GSM)
ParameterKey
V_GSM
Description

Solar Wind Velocity in GSM cartesian coordinates, 64-second average

Caveats
Solar Wind Velocity in GSM ccartesian coordinates, 64-second average
Units
km/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Element
Name
VX (GSM)
Qualifier
Component.I
Index
1
ValidMin
-1800.0
ValidMax
0.0
FillValue
-1.0E31
Element
Name
VY (GSM)
Qualifier
Component.J
Index
2
ValidMin
-900.0
ValidMax
900.0
FillValue
-1.0E31
Element
Name
VZ (GSM)
Qualifier
Component.K
Index
3
ValidMin
-900.0
ValidMax
900.0
FillValue
-1.0E31
Particle
ParticleType
Proton
Qualifier
Moment
Qualifier
Vector
ParticleQuantity
Velocity
Parameter #10
Name
S/C position in GSE
ParameterKey
SC_pos_GSE
Description

ACE s/c position in GSE coordinates

Units
km
UnitsConversion
1e3>m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
3
Element
Name
X GSE
Qualifier
Component.I
Index
1
ValidMin
-2000000.0
ValidMax
2000000.0
FillValue
-1.0E31
Element
Name
Y GSE
Qualifier
Component.J
Index
2
ValidMin
-2000000.0
ValidMax
2000000.0
FillValue
-1.0E31
Element
Name
Z GSE
Qualifier
Component.J
Index
3
ValidMin
-2000000.0
ValidMax
2000000.0
FillValue
-1.0E31
Support
SupportQuantity
Positional
Parameter #11
Name
S/C position in GSM
ParameterKey
SC_pos_GSM
Description

ACE s/c position in GSM coordinates

Caveats
Units
km
UnitsConversion
1e3>m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Element
Name
X GSM
Qualifier
Component.I
Index
1
ValidMin
-2000000.0
ValidMax
2000000.0
FillValue
-1.0E31
Element
Name
Y GSM
Qualifier
Component.J
Index
2
ValidMin
-2000000.0
ValidMax
2000000.0
FillValue
-1.0E31
Element
Name
Z GSM
Qualifier
Component.K
Index
3
ValidMin
-2000000.0
ValidMax
2000000.0
FillValue
-1.0E31
Support
SupportQuantity
Positional