Version:2.3.1

NumericalData

ResourceHeader

ResourceName

STEREO-A In-Situ Measurements of Particles and CME Transients (IMPACT) Fluxgate Magnetometer (MAG) Magnetic Field Vectors, in Radial-Tangential-Normal (RTN) Coordinates, Level Beacon (LB), PT0.125S Data

ReleaseDate

2020-04-21 12:34:56.789Z

Description

STEREO Ahead reprocessed IMPACT/MAG Beacon magnetic field vector component and vector magnitude data expressed in Heliographic, HG, Radial-Tangential-Normal, RTN, Cartesian coordinates around the 2015 solar conjunction.

• Version 1: Used internally at UCB and UCLA ONLY, No corrections applied to raw MAG data
• Version 2: Offset correction applied to MAG data
• Version 3: Initial algorithm for correcting glitches for the X sensor on STEREO Ahead applied
• Version 4: Improvement in glitch correction algorithm applied
• Version 5: Further refinement of the glitch correction for the X sensor on STEREO Ahead, Also, two timing issues resolved:

• a) applying a 6 ms time shift to account for time lag between IMPACT IDPU and MAG
• b) fixing an occasional 1 s 'glitch'

• Version 6: Added FILTER_VALUE variable

Acknowledgement

Please acknowledge the Principal Investigator J.G. Luhmann for use of the Data

Contacts

	Role	Person
1.	PrincipalInvestigator	spase://SMWG/Person/Janet.G.Luhmann
2.	MetadataContact	spase://SMWG/Person/Robert.M.Candey
3.	MetadataContact	spase://SMWG/Person/Lee.Frost.Bargatze

InformationURL

Name

STEREO IMPACT Experiment web site, UCB

URL

http://sprg.ssl.berkeley.edu/impact/

Description

STEREO, In-situ Measurements of Particles and CME Transients, IMPACT, experiment and data descriptions, web site hosted by UC Berkeley

AccessInformation

RepositoryID

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

Availability

Online

AccessRights

Open

AccessURL

Name

FTP access to CDF Files at SPDF

URL

ftps://spdf.gsfc.nasa.gov/pub/data/stereo/ahead/beacon_mag/

Description

Access to Data in CDF Format via ftp from SPDF

AccessURL

Name

HTTP access to CDF Files at SPDF

URL

https://spdf.gsfc.nasa.gov/pub/data/stereo/ahead/beacon_mag/

Description

Access to Data in CDF Format via http from SPDF

AccessURL

Name

CDAWeb

URL

https://cdaweb.sci.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=STA_LB_MAG_RTN&index=sp_phys

ProductKey

STA_LB_MAG_RTN

Description

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

Format

CDF

Encoding

None

Acknowledgement

Please acknowledge the Principal Investigator J.G. Luhmann. Please acknowledge the Data Providers and CDAWeb when using these Data.

ProcessingLevel

Calibrated

MeasurementType

MagneticField

TemporalDescription

TimeSpan

StartDate

2014-08-01 00:00:00.000

StopDate

2015-11-30 23:59:59.999

Cadence

PT0.125S

ObservedRegion

Heliosphere.Remote1AU

Parameter #1

Name

Epoch Time, since 0 A.D.

ParameterKey

Epoch

Description

Epoch Time, Milliseconds since 0 A.D.

Caveats

Interval-centered time tag

Cadence

PT0.125S

Units

ms

UnitsConversion

1e-3>s

RenderingHints

AxisLabel

Epoch

ValidMin

01-Jan-1990 00:00:00.000

ValidMax

31-Dec-2020 00:00:00.000

FillValue

31-Dec-9999 23:59:59.999

Support

SupportQuantity

Temporal

Parameter #2

Name

IMPACT/MAG Magnetic Field Vector in Heliographic, RTN

Set

Time series defined by using: EPOCH

ParameterKey

BFIELD

Description

IMPACT/MAG Magnetic Field Vector and Vector Magnitude in Heliographic, HG, Radial-Tangential-Normal, RTN, Coordinates

Cadence

PT0.125S

Units

nT

UnitsConversion

1e-9>T

CoordinateSystem

CoordinateRepresentation

Cartesian

CoordinateSystemName

RTN

RenderingHints

DisplayType

TimeSeries

ValueFormat

E13.6

ScaleType

LinearScale

Structure

Size

4

Element

Name

BR

Index

1

RenderingHints

AxisLabel

BR

Element

Name

BT

Index

2

RenderingHints

AxisLabel

BT

Element

Name

BN

Index

3

RenderingHints

AxisLabel

BN

Element

Name

BTotal

Index

4

RenderingHints

AxisLabel

BTotal

ValidMin

-10000.0

ValidMax

1.0e+06

FillValue

-1.0e+31

Field

Qualifier

Vector

FieldQuantity

Magnetic

Parameter #3

Name

Flag Values, IMPACT/MAG Magnetic Field Vector in Heliographic, RTN

Set

Time series defined by using: EPOCH

ParameterKey

MAGFLAGUC

Description

Bitwise stored Flag Values, IMPACT/MAG Magnetic Field Vector and Vector Magnitude in Heliographic, HG, Radial-Tangential-Normal, RTN, Coordinates

Caveats

* bit 0:3 Mag error counter * bit 4:7 Mag command counter * bit 8 Spare * bit 9 First * bit 10 Time * bit 11 Interface parity error: 0=OK, 1=Fault * bit 12 Interface timeout error: 0=OK, 1=Fault * bit 13 ADC calibration: 0=OFF, 1=ON * bit 14 In flight calibration: 0=OFF, 1=ON * bit 15 Range: 0=Low fields, High sensitivity, 1=High fields, Low sensitivity * bit 16 Calibration: 0=Old cal, 1=New cal * bit 17 6 ms added to sync correctly with IDPU * bit 18 62.5 ms to 8 hz data, no longer used * bit 19 Timestamp resync: that is, the time stamp has been changed, i.e. the 1 s glitch * bit 20 Data rate resync: timestamps were calculated with a different Δt for mixed frequency data or the data rate was not synced properly so the records timestamps were calculated incorrectly * bit 21 Derived from 32 hz MAG data

Cadence

PT0.125S

RenderingHints

AxisLabel

MAGFLAGUC

ValueFormat

I8

ScaleType

LinearScale

ValidMin

0

ValidMax

4294967295

FillValue

4294967295

Support

SupportQuantity

Other

Parameter #4

Name

Filter Value, Upper Limit for Valid Magnetic Field Magnitude

ParameterKey

FILTER_VALUE

Description

Filter Value corresponds to the Upper Limit for the expected Valid Range of Total Magnetic Field Values, when the Field is greater than the Filter Value, the Data is replaced with Fill Values as such Data are likely Spurious and Non-Physical

Cadence

PT0.125S

Units

nT

UnitsConversion

1e-9>T

RenderingHints

AxisLabel

filter

ValueFormat

E12.2

ScaleType

LinearScale

ValidMin

0.0

ValidMax

100000.0

FillValue

-1.0e+31

Support

Qualifier

Maximum

SupportQuantity

Other