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Ulysses Solar Wind Observations Over the Poles of the Sun (SWOOPS) Proton Particle Distribution Functions, Level H2, 4 min Data

ResourceID
spase://NASA/NumericalData/Ulysses/SWOOPS/Proton/ParticleDistributions/PT4M

Description

This File contains the Distribution Function of Protons. DATA REDUCTION: The SWOOPS (Solar Wind Observations Over the Poles of the Sun) Ion Instrument is a Spherical-Section Curved-Plate Electrostatic Analyzer. Particle Arrival Directions are measured in Spacecraft Coordinates of Azimuth (scanned by Spacecraft Rotation) and Elevation (determined by the Detector Number) Angles. The Spacecraft Spin Axis was oriented toward the Earth. The Energy/Charge (E/q) Resolution was about 2.5% while the Azimuth (Phi) and Elevation (Theta) Resolutions were both ~5.6°. A Description of the SWOOPS is given in a Paper by S.J. Bame, D.J. McComas, B.L. Barraclough, J.L. Phillips, K.J. Sofaly, J.C. Chavez, B.E. Goldstein, and R.K. Sakurai, Astronomy and Astrophysics Supplement Series, Ulysses Instruments Special Issue, Vol. 92, No. 2, p.237-265, 1992. The Number of Counts in each E/q-Phi-Theta Bin were examined to determine the Peak of the Proton and Alpha Particle Distribution, respectively, and the Vector Magnetic Field (in Spacecraft Coordinates) was obtained for the Time at which the Peak was measured. A "coarse" Two-Dimensional Matrix was then formed by rotating the Data into a Coordinate System with Axes parallel and perpendicular to the Field Direction. Note that Gyrotropy is assumed in making that Transformation. The Resolution of the Matrix is "coarse" because the Vector Velocity assigned to each Bin was taken to be at the Center of the Bin. In reality, the Counts in each Bin were probably not smoothly distributed in Velocity Space over the Bin, but were weighted toward the Part of the Bin nearest the Center of the Peak of the Velocity Distribution. The "coarse" Distribution would thus yield Values for the Density and Temperature that were higher than the true Values. A Correction for that effect was accomplished by fitting Contours to the coarse Distribution, breaking each Bin or Pixel into Subpixels, and then using the Contours and the calibrated Angular Responses to distribute the Counts among the Subpixels. New Contours were then computed and the Process was continued until it converged. More Details about this Deconvolution of the Angular Data are given in the Appendix of a Paper by Neugebauer, M., et al., "Ion distributions in large magnetic holes in the fast solar wind" J. Geophys. Res., 106, 5635, 2001. This Procedure generated the Matrix of Velocity Distribution Functions of Protons and Alpha Particles parallel and perpendicular to the simultaneously measured Magnetic Field.

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Details

Version:2.3.2

NumericalData

ResourceID
spase://NASA/NumericalData/Ulysses/SWOOPS/Proton/ParticleDistributions/PT4M
ResourceHeader
ResourceName
Ulysses Solar Wind Observations Over the Poles of the Sun (SWOOPS) Proton Particle Distribution Functions, Level H2, 4 min Data
ReleaseDate
2021-04-27 15:38:11Z
Description

This File contains the Distribution Function of Protons. DATA REDUCTION: The SWOOPS (Solar Wind Observations Over the Poles of the Sun) Ion Instrument is a Spherical-Section Curved-Plate Electrostatic Analyzer. Particle Arrival Directions are measured in Spacecraft Coordinates of Azimuth (scanned by Spacecraft Rotation) and Elevation (determined by the Detector Number) Angles. The Spacecraft Spin Axis was oriented toward the Earth. The Energy/Charge (E/q) Resolution was about 2.5% while the Azimuth (Phi) and Elevation (Theta) Resolutions were both ~5.6°. A Description of the SWOOPS is given in a Paper by S.J. Bame, D.J. McComas, B.L. Barraclough, J.L. Phillips, K.J. Sofaly, J.C. Chavez, B.E. Goldstein, and R.K. Sakurai, Astronomy and Astrophysics Supplement Series, Ulysses Instruments Special Issue, Vol. 92, No. 2, p.237-265, 1992. The Number of Counts in each E/q-Phi-Theta Bin were examined to determine the Peak of the Proton and Alpha Particle Distribution, respectively, and the Vector Magnetic Field (in Spacecraft Coordinates) was obtained for the Time at which the Peak was measured. A "coarse" Two-Dimensional Matrix was then formed by rotating the Data into a Coordinate System with Axes parallel and perpendicular to the Field Direction. Note that Gyrotropy is assumed in making that Transformation. The Resolution of the Matrix is "coarse" because the Vector Velocity assigned to each Bin was taken to be at the Center of the Bin. In reality, the Counts in each Bin were probably not smoothly distributed in Velocity Space over the Bin, but were weighted toward the Part of the Bin nearest the Center of the Peak of the Velocity Distribution. The "coarse" Distribution would thus yield Values for the Density and Temperature that were higher than the true Values. A Correction for that effect was accomplished by fitting Contours to the coarse Distribution, breaking each Bin or Pixel into Subpixels, and then using the Contours and the calibrated Angular Responses to distribute the Counts among the Subpixels. New Contours were then computed and the Process was continued until it converged. More Details about this Deconvolution of the Angular Data are given in the Appendix of a Paper by Neugebauer, M., et al., "Ion distributions in large magnetic holes in the fast solar wind" J. Geophys. Res., 106, 5635, 2001. This Procedure generated the Matrix of Velocity Distribution Functions of Protons and Alpha Particles parallel and perpendicular to the simultaneously measured Magnetic Field.

Acknowledgement
D.J. McComas, B.E. Goldstein, M.M. Neugebauer, A. Tenerani
Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://SMWG/Person/David.J.McComas
2.PrincipalInvestigatorspase://SMWG/Person/Bruce.E.Goldstein
3.PrincipalInvestigatorspase://SMWG/Person/Marcia.M.Neugebauer
4.PrincipalInvestigatorspase://SMWG/Person/Anna.Tenerani
5.MetadataContactspase://SMWG/Person/Robert.E.McGuire
6.MetadataContactspase://SMWG/Person/Lee.Frost.Bargatze
InformationURL
Name
The Ulysses Solar Wind Observations Over the Poles of the Sun, SWOOPS, Instrument Web Page hosted at the Los Alamos National Laboratory, LANL
URL
Description

The Ulysses SWOOPS Web Page, LANL

PriorIDs
spase://VSPO/NumericalData/Ulysses/SWOOPS/Proton/ParticleDistributions/PT4M
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description

Access to Data in CDF Format via ftp from SPDF

AccessURL
Name
HTTPS from SPDF
URL
Description

Access to Data in CDF Format via http from SPDF

AccessURL
Name
CDAWeb
URL
ProductKey
UY_PROTON-DISTRIBUTIONS_SWOOPS
Description

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

Format
CDF
Encoding
None
Acknowledgement
D.J. McComas, B.E. Goldstein, M.M. Neugebauer, A. Tenerani. 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
UY_PROTON-DISTRIBUTIONS_SWOOPS
Description

Web Service to this product using the HAPI interface.

Format
CSV
Acknowledgement
D.J. McComas, B.E. Goldstein, M.M. Neugebauer, A. Tenerani. Please acknowledge the Data Providers and CDAWeb when using these Data.
ProcessingLevel
Calibrated
InstrumentIDs
MeasurementType
EnergeticParticles
MeasurementType
MagneticField
MeasurementType
ThermalPlasma
TemporalDescription
TimeSpan
StartDate
1990-11-18 02:52:56.000
StopDate
2009-06-30 15:38:12.000
Cadence
PT4M
ObservedRegion
Heliosphere
ObservedRegion
Heliosphere.Inner
ObservedRegion
Heliosphere.NearEarth
ObservedRegion
Heliosphere.Outer
Parameter #1
Name
Epoch Time
ParameterKey
Epoch
Description

Epoch Time

Caveats
This Parameter exhibits an increasing Monotonic Progression.
Cadence
PT4M
Units
ms
UnitsConversion
1.0e-3>s
RenderingHints
AxisLabel
Epoch
ValueFormat
E14.8
ValidMin
18-Nov-1990 00:00:00.000
ValidMax
01-Jul-2009 00:00:00.000
FillValue
-1.0e+31
Support
SupportQuantity
Temporal
Parameter #2
Name
Heliographic Latitude, HG
Set
Time Series defined by using: EPOCH
ParameterKey
heliographicLatitude
Description

Heliographic Latitude in Heliographic, HG, Coordinates

Cadence
PT4M
Units
°
UnitsConversion
0.0174532925>rad
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
HG
RenderingHints
DisplayType
TimeSeries
AxisLabel
HG_Lat
ValueFormat
F7.1
ScaleType
LinearScale
ValidMin
-90.0
ValidMax
90.0
FillValue
-1.0e+31
Support
Qualifier
DirectionAngle.ElevationAngle
SupportQuantity
Positional
Parameter #3
Name
Heliocentric Distance
Set
Time Series defined by using: EPOCH
ParameterKey
heliocentricDistance
Description

Heliocentric Distance

Cadence
PT4M
Units
ua
UnitsConversion
1.495978706961e11>m
RenderingHints
DisplayType
TimeSeries
AxisLabel
Ulysses_Dist
ValueFormat
F8.2
ScaleType
LinearScale
ValidMin
0.0
ValidMax
99999.0
FillValue
-1.0e+31
Support
Qualifier
Magnitude
SupportQuantity
Positional
Parameter #4
Name
Magnetic Field BR Component, RTN
Set
Time Series defined by using: EPOCH
ParameterKey
BR
Description

Magnetic Field BR Component in Inertial Radial, Tangential, Normal, RTN, Coordinates

Cadence
PT4M
Units
nT
UnitsConversion
1.0e-9>T
RenderingHints
DisplayType
TimeSeries
AxisLabel
BR_(RTN)
ValueFormat
F10.4
ScaleType
LinearScale
ValidMin
-9999.0
ValidMax
9999.0
FillValue
-1.0e+31
Field
Qualifier
Component.I
FieldQuantity
Magnetic
Parameter #5
Name
Magnetic Field BT Component, RTN
Set
Time Series defined by using: EPOCH
ParameterKey
BT
Description

Magnetic Field BT Component in Inertial Radial, Tangential, Normal, RTN, Coordinates

Cadence
PT4M
Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
HGI
RenderingHints
DisplayType
TimeSeries
AxisLabel
BT_(RTN)
ValueFormat
F10.4
ScaleType
LinearScale
ValidMin
-9999.0
ValidMax
9999.0
FillValue
-1.0e+31
Field
Qualifier
Component.J
FieldQuantity
Magnetic
Parameter #6
Name
Magnetic Field BN Component, RTN
Set
Time Series defined by using: EPOCH
ParameterKey
BN
Description

Magnetic Field BN Component in Inertial Radial, Tangential, Normal, RTN, Coordinates

Cadence
PT4M
Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
HGI
RenderingHints
DisplayType
TimeSeries
AxisLabel
BN_(RTN)
ValueFormat
F10.4
ScaleType
LinearScale
ValidMin
-9999.0
ValidMax
9999.0
FillValue
-1.0e+31
Field
Qualifier
Component.K
FieldQuantity
Magnetic
Parameter #7
Name
Magnetic Field Magnitude
Set
Time Series defined by using: EPOCH
ParameterKey
B_MAG
Description

Magnetic Field Magnitude

Cadence
PT4M
Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
HGI
RenderingHints
DisplayType
TimeSeries
AxisLabel
B_MAG
ValueFormat
F10.4
ScaleType
LinearScale
ValidMin
0.0
ValidMax
9999.0
FillValue
-1.0e+31
Field
Qualifier
Magnitude
FieldQuantity
Magnetic
Parameter #8
Name
H+ Flow Speed
Set
Time Series defined by using: EPOCH
ParameterKey
V_MAG
Description

Proton, H+, Velocity, Magnitude

Cadence
PT4M
Units
km/s
UnitsConversion
1.0e3>m/s
RenderingHints
DisplayType
TimeSeries
AxisLabel
V_MAG (RTN)
ValueFormat
F8.1
ScaleType
LinearScale
ValidMin
0.0
ValidMax
999999.0
FillValue
-1.0e+31
Particle
ParticleType
AlphaParticle
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
AtomicNumber
2
Parameter #9
Name
H+ Distribution Function, Log10
Set
Time Series defined by using: EPOCH
ParameterKey
Matrix
Description

Proton, H+, Distribution Function, Base 10 Logarithm

Caveats
Log10 of the Distribution Function. The Distribution Function is a 50⨯25 Matrix. If at a given Time, v_par and/or v_per have a smaller Number of Elements than 50 and 25, respectively, then the undefined Array Entries of v_par and/or v_per and of the Distribution Function are set to a FILLVAL equal to -1.0e30.
Cadence
PT4M
Units
s^3/(km^3 cm^3)
UnitsConversion
1.0e-3>s^3/m^6
RenderingHints
ValueFormat
F10.4
ScaleType
LinearScale
Structure
Size
50 25
FillValue
-1.0e+31
Particle
ParticleType
AlphaParticle
Qualifier
Tensor
ParticleQuantity
PhaseSpaceDensity
AtomicNumber
2
Parameter #10
Name
H+ Bulk Flow Speed, parallel
Set
Time Series defined by using: EPOCH
ParameterKey
v_par
Description

Proton, H+, Bulk Flow Speed parallel to the Magnetic Field

Caveats
50 Element Array This Parameter exhibits an increasing Monotonic Progression.
Cadence
PT4M
Units
km/s
UnitsConversion
1.0e3>m/s
RenderingHints
DisplayType
Spectrogram
AxisLabel
V_Par
ValueFormat
F10.4
ScaleType
LinearScale
Structure
Size
50
Element
Name
Element 1
Index
1
RenderingHints
AxisLabel
1
Element
Name
Element 2
Index
2
RenderingHints
AxisLabel
2
Element
Name
Element 3
Index
3
RenderingHints
AxisLabel
3
Element
Name
Element 4
Index
4
RenderingHints
AxisLabel
4
Element
Name
Element 5
Index
5
RenderingHints
AxisLabel
5
Element
Name
Element 6
Index
6
RenderingHints
AxisLabel
6
Element
Name
Element 7
Index
7
RenderingHints
AxisLabel
7
Element
Name
Element 8
Index
8
RenderingHints
AxisLabel
8
Element
Name
Element 9
Index
9
RenderingHints
AxisLabel
9
Element
Name
Element 10
Index
10
RenderingHints
AxisLabel
10
Element
Name
Element 11
Index
11
RenderingHints
AxisLabel
11
Element
Name
Element 12
Index
12
RenderingHints
AxisLabel
12
Element
Name
Element 13
Index
13
RenderingHints
AxisLabel
13
Element
Name
Element 14
Index
14
RenderingHints
AxisLabel
14
Element
Name
Element 15
Index
15
RenderingHints
AxisLabel
15
Element
Name
Element 16
Index
16
RenderingHints
AxisLabel
16
Element
Name
Element 17
Index
17
RenderingHints
AxisLabel
17
Element
Name
Element 18
Index
18
RenderingHints
AxisLabel
18
Element
Name
Element 19
Index
19
RenderingHints
AxisLabel
19
Element
Name
Element 20
Index
20
RenderingHints
AxisLabel
20
Element
Name
Element 21
Index
21
RenderingHints
AxisLabel
21
Element
Name
Element 22
Index
22
RenderingHints
AxisLabel
22
Element
Name
Element 23
Index
23
RenderingHints
AxisLabel
23
Element
Name
Element 24
Index
24
RenderingHints
AxisLabel
24
Element
Name
Element 25
Index
25
RenderingHints
AxisLabel
25
Element
Name
Element 26
Index
26
RenderingHints
AxisLabel
26
Element
Name
Element 27
Index
27
RenderingHints
AxisLabel
27
Element
Name
Element 28
Index
28
RenderingHints
AxisLabel
28
Element
Name
Element 29
Index
29
RenderingHints
AxisLabel
29
Element
Name
Element 30
Index
30
RenderingHints
AxisLabel
30
Element
Name
Element 31
Index
31
RenderingHints
AxisLabel
31
Element
Name
Element 32
Index
32
RenderingHints
AxisLabel
32
Element
Name
Element 33
Index
33
RenderingHints
AxisLabel
33
Element
Name
Element 34
Index
34
RenderingHints
AxisLabel
34
Element
Name
Element 35
Index
35
RenderingHints
AxisLabel
35
Element
Name
Element 36
Index
36
RenderingHints
AxisLabel
36
Element
Name
Element 37
Index
37
RenderingHints
AxisLabel
37
Element
Name
Element 38
Index
38
RenderingHints
AxisLabel
38
Element
Name
Element 39
Index
39
RenderingHints
AxisLabel
39
Element
Name
Element 40
Index
40
RenderingHints
AxisLabel
40
Element
Name
Element 41
Index
41
RenderingHints
AxisLabel
41
Element
Name
Element 42
Index
42
RenderingHints
AxisLabel
42
Element
Name
Element 43
Index
43
RenderingHints
AxisLabel
43
Element
Name
Element 44
Index
44
RenderingHints
AxisLabel
44
Element
Name
Element 45
Index
45
RenderingHints
AxisLabel
45
Element
Name
Element 46
Index
46
RenderingHints
AxisLabel
46
Element
Name
Element 47
Index
47
RenderingHints
AxisLabel
47
Element
Name
Element 48
Index
48
RenderingHints
AxisLabel
48
Element
Name
Element 49
Index
49
RenderingHints
AxisLabel
49
Element
Name
Element 50
Index
50
RenderingHints
AxisLabel
50
ValidMin
-1000.0
ValidMax
1000.0
FillValue
-1.0e+31
Particle
ParticleType
AlphaParticle
Qualifier
Array
Qualifier
Component
Qualifier
FieldAligned
Qualifier
Parallel
ParticleQuantity
Velocity
AtomicNumber
2
Parameter #11
Name
H+ Velocity perpendicular to the Magnetic Field
Set
Time Series defined by using: EPOCH
ParameterKey
v_per
Description

Proton, H+, Perpendicular Velocity, v_perp, Speed perpendicular to the Magnetic Field

Caveats
25 Element Array This Parameter exhibits an increasing Monotonic Progression.
Cadence
PT4M
Units
km/s
UnitsConversion
1.0e3>m/s
RenderingHints
DisplayType
Spectrogram
AxisLabel
V_Per
ValueFormat
F10.4
ScaleType
LinearScale
Structure
Size
25
Element
Name
Element 1
Index
1
RenderingHints
AxisLabel
1
Element
Name
Element 2
Index
2
RenderingHints
AxisLabel
2
Element
Name
Element 3
Index
3
RenderingHints
AxisLabel
3
Element
Name
Element 4
Index
4
RenderingHints
AxisLabel
4
Element
Name
Element 5
Index
5
RenderingHints
AxisLabel
5
Element
Name
Element 6
Index
6
RenderingHints
AxisLabel
6
Element
Name
Element 7
Index
7
RenderingHints
AxisLabel
7
Element
Name
Element 8
Index
8
RenderingHints
AxisLabel
8
Element
Name
Element 9
Index
9
RenderingHints
AxisLabel
9
Element
Name
Element 10
Index
10
RenderingHints
AxisLabel
10
Element
Name
Element 11
Index
11
RenderingHints
AxisLabel
11
Element
Name
Element 12
Index
12
RenderingHints
AxisLabel
12
Element
Name
Element 13
Index
13
RenderingHints
AxisLabel
13
Element
Name
Element 14
Index
14
RenderingHints
AxisLabel
14
Element
Name
Element 15
Index
15
RenderingHints
AxisLabel
15
Element
Name
Element 16
Index
16
RenderingHints
AxisLabel
16
Element
Name
Element 17
Index
17
RenderingHints
AxisLabel
17
Element
Name
Element 18
Index
18
RenderingHints
AxisLabel
18
Element
Name
Element 19
Index
19
RenderingHints
AxisLabel
19
Element
Name
Element 20
Index
20
RenderingHints
AxisLabel
20
Element
Name
Element 21
Index
21
RenderingHints
AxisLabel
21
Element
Name
Element 22
Index
22
RenderingHints
AxisLabel
22
Element
Name
Element 23
Index
23
RenderingHints
AxisLabel
23
Element
Name
Element 24
Index
24
RenderingHints
AxisLabel
24
Element
Name
Element 25
Index
25
RenderingHints
AxisLabel
25
ValidMin
-1000.0
ValidMax
1000.0
FillValue
-1.0e+31
Particle
ParticleType
AlphaParticle
Qualifier
Array
Qualifier
Component
Qualifier
Perpendicular
ParticleQuantity
Velocity
AtomicNumber
2
Parameter #12
Name
H+ Parallel Velocity index
Set
Time Series defined by using: EPOCH
ParameterKey
v_par_index
Description

Proton, H+, Parallel Velocity index

Cadence
PT4M
RenderingHints
ValueFormat
I2
ScaleType
LinearScale
Structure
Size
50
ValidMin
1
ValidMax
50
FillValue
-9
Support
SupportQuantity
Other
Parameter #13
Name
H+ Perpendicular Velocity Index
Set
Time Series defined by using: EPOCH
ParameterKey
v_per_index
Description

Proton, H+, Perpendicular Velocity Index

Cadence
PT4M
RenderingHints
ValueFormat
I2
ScaleType
LinearScale
Structure
Size
25
ValidMin
1
ValidMax
25
FillValue
-9
Support
SupportQuantity
Other