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

ResourceID

spase://VSPO/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://VSPO/NumericalData/ACE/SWEPAM/L2/PT64S

ResourceHeader

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

ReleaseDate: 2019-08-05 15:03:35Z

Description

Acknowledgement: Please acknowledge the ACE/SWEPAM instrument team and the ACE Science Center

Contacts

	Role	Person
1.	TechnicalContact	spase://SMWG/Person/Ruth.Skoug
2.	PrincipalInvestigator	spase://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

AccessInformation

RepositoryID: spase://SMWG/Repository/NASA/GSFC/SPDF

Availability: Online

AccessRights: Open

AccessURL

Name: FTP access to files at SPDF

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: HTTP access to files at 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