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Polar Cap (PC), Northern and Southern Hemisphere Activity Indices, 5 min Data

ResourceID
spase://NASA/NumericalData/Interball/PC_Index/KeyParameter/K0/PT5M

Description

The PC Index is an Empirical Magnetic Activity Index based on Data from Single Near-Pole Station, Thule for the Northern Hemisphere and Vostok for the Southern Hemisphere, respectively). Its Derivation Procedure is optimized to achieve the Best Correlation of PC Index with the Solar Wind Electric Field, SWEF, Magnitude quantified by vBsin((theta/2)^2). The Average Horizontal Magnetic Disturbance Vector, Quiet Value subtracted, is projected onto the Optimal Direction, which is defined empirically for each UT Hour and each Season based on the Best COrrelation with the SWEF. After Normalization to the Equivalent Value of the SWEF, the PC Index is expressed in Units of mV/m. Although the PC Index is formally expressed in mV/m, it actually represents the Measure of Magnetic Activity, the Normalization Procedure to SWEF helps to reduce Seasonal and Diurnal Effects to facilitate the Intercomparison. The Time Resolution of the Northern Cap PC Index is 5 min while it is 15 min form the Southern PC Index. However, one Time SCale with a 5 min Step is used for both Indices and each 15 min averaged Value of southern index is, hence, repeated three Times. References: 1. Troshichev, O.A., et al., Planet. Space Sci., 36, 1095, 1988, 2. Vennerstrom, S., et al., Report UAG-103, World Data Center A for STP, Boulder, April 1994.

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Details

Version:2.2.8

NumericalData

ResourceID
spase://NASA/NumericalData/Interball/PC_Index/KeyParameter/K0/PT5M
ResourceHeader
ResourceName
Polar Cap (PC), Northern and Southern Hemisphere Activity Indices, 5 min Data
ReleaseDate
2020-07-07 21:14:44Z
Description

The PC Index is an Empirical Magnetic Activity Index based on Data from Single Near-Pole Station, Thule for the Northern Hemisphere and Vostok for the Southern Hemisphere, respectively). Its Derivation Procedure is optimized to achieve the Best Correlation of PC Index with the Solar Wind Electric Field, SWEF, Magnitude quantified by vBsin((theta/2)^2). The Average Horizontal Magnetic Disturbance Vector, Quiet Value subtracted, is projected onto the Optimal Direction, which is defined empirically for each UT Hour and each Season based on the Best COrrelation with the SWEF. After Normalization to the Equivalent Value of the SWEF, the PC Index is expressed in Units of mV/m. Although the PC Index is formally expressed in mV/m, it actually represents the Measure of Magnetic Activity, the Normalization Procedure to SWEF helps to reduce Seasonal and Diurnal Effects to facilitate the Intercomparison. The Time Resolution of the Northern Cap PC Index is 5 min while it is 15 min form the Southern PC Index. However, one Time SCale with a 5 min Step is used for both Indices and each 15 min averaged Value of southern index is, hence, repeated three Times. References: 1. Troshichev, O.A., et al., Planet. Space Sci., 36, 1095, 1988, 2. Vennerstrom, S., et al., Report UAG-103, World Data Center A for STP, Boulder, April 1994.

Acknowledgement
O.A. Troshichev
Contacts
RolePerson
1.PrincipalInvestigatorspase://SMWG/Person/Oleg.A.Troshichev
2.MetadataContactspase://SMWG/Person/Robert.E.McGuire
3.MetadataContactspase://SMWG/Person/Lee.Frost.Bargatze
PriorIDs
spase://VSPO/NumericalData/Interball/PC_Index/KeyParameter/K0/PT5M
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/interball/ground/geo_index/
Description

Access to Data in CDF Format via ftp from SPDF

AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/interball/ground/geo_index/
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=IG_K0_PCI&index=sp_phys
ProductKey
IG_K0_PCI
Description

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

Format
CDF
Encoding
None
Acknowledgement
O.A. Troshichev. Please acknowledge the data providers and CDAWeb when using these data.
ProcessingLevel
Calibrated
InstrumentIDs
spase://SMWG/Instrument/Ground/Thule.Air.Base/Magnetometer
spase://SMWG/Instrument/Ground/Vostok/Magnetometer
MeasurementType
ActivityIndex
TemporalDescription
TimeSpan
StartDate
1995-08-07 00:02:30
StopDate
2000-10-22 23:57:30
Cadence
PT5M
ObservedRegion
Earth.NearSurface.PolarCap
Parameter #1
Name
Epoch Time, Centered
ParameterKey
Epoch
Description

Epoch Time, Centered

Caveats
This parameter exhibits an increasing monotonic progression.
Cadence
PT5M
Units
ms
UnitsConversion
1e-3>s
RenderingHints
AxisLabel
Epoch
ScaleMin
6.2974951569904e+13
ScaleMax
6.2975556069904e+13
ValidMin
01-Jan-1994 00:00:00.000
ValidMax
31-Dec-2020 23:59:59.000
FillValue
-1.0e+31
Support
SupportQuantity
Temporal
Parameter #2
Name
Southern PC Index, PCS, Vostok
Set
Time series defined by using: EPOCH
ParameterKey
PC_Vostok
Description

Southern Polar Cap Magnetic Activity Index, PCS, Vostok

Caveats
15 min averaged value of southern index is repeated for three times.
Cadence
PT5M
Units
mV/m
UnitsConversion
1e-3>V/m
RenderingHints
DisplayType
TimeSeries
AxisLabel
PCS
ValueFormat
F5.1
ScaleMin
-5.0
ScaleMax
15.0
ValidMin
-10.0
ValidMax
30.0
FillValue
-1.0e+31
Field
FieldQuantity
Electric
Parameter #3
Name
Northern PC Index, PCN, Thule
Set
Time series defined by using: EPOCH
ParameterKey
PC_Thule
Description

Northern Polar Cap Magnetic Activity Index, PCN, Thule

Caveats
5 min. resolution
Cadence
PT5M
Units
mV/m
UnitsConversion
1e-3>V/m
RenderingHints
DisplayType
TimeSeries
AxisLabel
PCN
ValueFormat
F5.1
ScaleMin
-5.0
ScaleMax
15.0
ValidMin
-10.0
ValidMax
30.0
FillValue
-1.0e+31
Field
FieldQuantity
Electric
Parameter #4
Name
Status Flag, PCS
Set
Time series defined by using: EPOCH
ParameterKey
Flag_Vostok
Description

Status Flag, PCS: 0=Good Data, 2=Missing Data, 5=Data Delayed

Caveats
Average Type: none
Cadence
PT5M
RenderingHints
AxisLabel
FLag_S
ValueFormat
I2
ScaleMin
0
ScaleMax
5
ValidMin
0
ValidMax
5
FillValue
128
Support
SupportQuantity
InstrumentMode
Parameter #5
Name
Status Flag, PCN
Set
Time series defined by using: EPOCH
ParameterKey
Flag_Thule
Description

Status Flag, PCN: 0=Good Data, 2=Missing Data, 5=Data Delayed

Caveats
Average Type: none
Cadence
PT5M
RenderingHints
AxisLabel
Flag_N
ValueFormat
I2
ScaleMin
0
ScaleMax
5
ValidMin
0
ValidMax
5
FillValue
128
Support
SupportQuantity
InstrumentMode
Parameter #6
Name
Post Gap Flag
Set
Time series defined by using: EPOCH
ParameterKey
Gap_Flag
Description

Post Gap Flag: 0=No Gap before this Point, Values 1 to 5 denote Specific Gap Types

Caveats
Average Type: none
Cadence
PT5M
RenderingHints
AxisLabel
GAP_FLAG
ValueFormat
I1
ScaleMin
0
ScaleMax
5
ValidMin
0
ValidMax
5
FillValue
-2147483648
Support
SupportQuantity
InstrumentMode