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Wind MFI Magnetic Cloud Table 2

(1995). Wind MFI Magnetic Cloud Table 2. [Data set]. The NASA WIND website. https://doi.org/10.48322/n421-fc77. Accessed on .

Note: Proper references, including or other formats, should include the "Accessed on date" to identify the version of the resource being cited in a given publication.

ResourceID
spase://NASA/Catalog/Wind/MFI/Magnetic_Cloud_Fit_Parameters

Description
MAGNETIC CLOUD FIT PARAMETERS AS DETERMINED BY MFI DATA. The table consists of estimated start and end times, as designated, and physical quantities that were estimated by a magnetic field model [Lepping et al., 1990] that assumes that the field within a magnetic cloud is force free, i.e., so that the electrical current and the magnetic field are aligned and proportional in strength everywhere within its volume. The angles φA and θA refer to the estimated direction of the cloud's axis, where φA is a longitude and θA is a latitude in GSE coordinates. 2Ro is the diameter (in AU) of the magnetic cloud, assumed circular in cross-section, based on model results and the radial speed of the solar wind provided by the WIND SWE instrument (K. W. Ogilvie, PI). Bo is the model-estimated magnetic field strength for the axis of the cloud. We point out that the spacecraft rarely encounters the actual axis, but passes above or below at various closest approach (CA) distances that are also estimated by the model (not shown explicitly here - but see CA% below.) χR is actually chi/√(3N-5), based on the reduced chi-squared value, which is the usual chi-squared value divided by (3N-n), where N is the number of points (usually hour averages) used in the model fitting and n is fixed at 5 which is the number of parameters fitted up to this time; two other parameters are fitted later in the process, making it a 7 parameter model. H represents helical field handedness, right-or-left-handed. CA% means the ratio of CA distance of the spacecraft from the cloud's axis to the cloud's radius, expressed in percentage. Φ is the estimated magnetic flux along the axis of the magnetic cloud where Φ= 1.36 BR**2.

Metadata Rights
CC0-1.0: Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions. The actual data/software may be subject to a different license.

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Version:2.7.1

Catalog

ResourceID
spase://NASA/Catalog/Wind/MFI/Magnetic_Cloud_Fit_Parameters
NamingAuthority
NASA
ResourceType
Catalog
ResourceHeader
ResourceName
Wind MFI Magnetic Cloud Table 2
AlternateName
MAGNETIC CLOUD FIT PARAMETERS AS DETERMINED BY MFI DATA
DOI
https://doi.org/10.48322/n421-fc77
ReleaseDate
2026-02-02 13:10:27Z
RevisionHistory
RevisionEvent
ReleaseDate
2024-02-03 00:08:46
Note
Metadata created by OYU; reviewed by SY
RevisionEvent
ReleaseDate
2024-02-05 16:08:46
Note
Added DOI by SY
RevisionEvent
ReleaseDate
2026-02-02 13:10:27Z
Note
Added MetadataRightsList and RightsList(s). Added ResourceType and NamingAuthority. Updated to 2.7.1. Changed http to https in top-level schemaLocation attribute. ZCB
Description
MAGNETIC CLOUD FIT PARAMETERS AS DETERMINED BY MFI DATA. The table consists of estimated start and end times, as designated, and physical quantities that were estimated by a magnetic field model [Lepping et al., 1990] that assumes that the field within a magnetic cloud is force free, i.e., so that the electrical current and the magnetic field are aligned and proportional in strength everywhere within its volume. The angles φA and θA refer to the estimated direction of the cloud's axis, where φA is a longitude and θA is a latitude in GSE coordinates. 2Ro is the diameter (in AU) of the magnetic cloud, assumed circular in cross-section, based on model results and the radial speed of the solar wind provided by the WIND SWE instrument (K. W. Ogilvie, PI). Bo is the model-estimated magnetic field strength for the axis of the cloud. We point out that the spacecraft rarely encounters the actual axis, but passes above or below at various closest approach (CA) distances that are also estimated by the model (not shown explicitly here - but see CA% below.) χR is actually chi/√(3N-5), based on the reduced chi-squared value, which is the usual chi-squared value divided by (3N-n), where N is the number of points (usually hour averages) used in the model fitting and n is fixed at 5 which is the number of parameters fitted up to this time; two other parameters are fitted later in the process, making it a 7 parameter model. H represents helical field handedness, right-or-left-handed. CA% means the ratio of CA distance of the spacecraft from the cloud's axis to the cloud's radius, expressed in percentage. Φ is the estimated magnetic flux along the axis of the magnetic cloud where Φ= 1.36 BR**2.
PublicationInfo
Authors
LEPPING, RONALD P
PublicationDate
1995-02-08 12:00:00
PublishedBy
The NASA WIND website
Contacts
Role Person StartDate StopDate Note
1. Author spase://SMWG/Person/Ronald.P.Lepping
2. MetadataContact spase://SMWG/Person/Olga.Y.Uritskaya

AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/Wind
RightsList
Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
SPDX
RightsIdentifier
CC0-1.0
RightsURI
https://spdx.org/licenses/CC0-1.0.html
RightsName
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products
AccessURL
URL
https://wind.nasa.gov/mfi/mag_cloud_S1.html
Format
Text
InstrumentIDs
spase://SMWG/Instrument/Wind/MFI
PhenomenonType
MagneticCloud
Parameter #1
Name
CODE
Description
Event identification number
Support
SupportQuantity
Other
Parameter #2
Name
YR
Description
Year
Support
SupportQuantity
Temporal
Parameter #3
Name
START TIME/MON
Description
START TIME, month
Support
SupportQuantity
Temporal
Parameter #4
Name
START TIME/Day
Description
START TIME, day
Support
SupportQuantity
Temporal
Parameter #5
Name
START TIME/DOY
Description
START TIME, day of the year
Support
SupportQuantity
Temporal
Parameter #6
Name
START TIME/HR
Description
START TIME, hour
Support
SupportQuantity
Temporal
Parameter #7
Name
END TIME/MON
Description
END TIME, month
Support
SupportQuantity
Temporal
Parameter #8
Name
END TIME/Day
Description
END TIME, day
Support
SupportQuantity
Temporal
Parameter #9
Name
END TIME/DOY
Description
END TIME, day of the year
Support
SupportQuantity
Temporal
Parameter #10
Name
END TIME/HR
Description
END TIME, hour
Support
SupportQuantity
Temporal
Parameter #11
Name
ESTIMATED (model) ΔT
Description
Duration of the encounter
Units
hours
Support
SupportQuantity
Temporal
Parameter #12
Name
φA
Description
Axis direction in terms of (GSE) estimated longitude (φA) and latitude (θA)
Support
SupportQuantity
Orientation
Parameter #13
Name
θA
Description
Axis direction in terms of (GSE) estimated longitude (φA) and latitude (θA)
Support
SupportQuantity
Orientation
Parameter #14
Name
V
Description
An average solar wind speed
Units
km/s
Support
SupportQuantity
Velocity
Parameter #15
Name
2Ro
Description
Estimated diameter (in AU), where Ro is the model estimated radius
Units
AU
Support
SupportQuantity
Other
Parameter #16
Name
Bo
Description
Estimated axial field magnitude (in nT)
Units
nT
Support
SupportQuantity
Other
Parameter #17
Name
H
Description
Handedness (+1 for right-handed or -1 for left-handed)
Support
SupportQuantity
Other
Parameter #18
Name
χR
Description
χR, square root of reduced chi-squared of fit
Support
SupportQuantity
Other
Parameter #19
Name
asf
Description
Asymmetry factor (%)
Units
%
Support
SupportQuantity
Other
Parameter #20
Name
CA
Description
CA(%), estimated relative closest approach distance, Yo/Ro (%). Case marked with * are possible core-annulus cases and are not necessarily expected to have a small "check" - see ck%
Units
%
Support
SupportQuantity
Other
Parameter #21
Name
Φo
Description
Axial magnetic flux (in 1020 Mx)
Units
1020 Mx
Support
SupportQuantity
Other
Parameter #22
Name
Jo
Description
Axial current density (in μA/km2)
Units
Jo, axial current density (in μA/km2)
Support
SupportQuantity
Other
Parameter #23
Name
Δt
Description
Analysis interval length (averages of 15 minutes, 30 minutes, or 1 hour)
Units
min
Support
SupportQuantity
Temporal
Parameter #24
Name
βCA
Description
Cone angle, the angle between the MC's axis and the X-axis (GSE)
Support
SupportQuantity
Other
Parameter #25
Name
CK%
Description
"Check" of estimated radius by using duration, speed and βCA
Units
%
Support
SupportQuantity
Other
Parameter #26
Name
IT
Description
Total axial current (in 10^8A)
Units
10^8A
Support
SupportQuantity
Other
Parameter #27
Name
Np
Description
Number of "points" (averages-see footnote I) used in the fitting interval
Support
SupportQuantity
Other
Parameter #28
Name
<Bx>
Description
The vector (<BX>CI,<BY>CI,<BZ>CI), where CI refers to Cloud coordinates
Units
nT
Support
SupportQuantity
Other
Parameter #29
Name
<By>
Description
The vector (<BX>CI,<BY>CI,<BZ>CI), where CI refers to Cloud coordinates
Units
nT
Support
SupportQuantity
Other
Parameter #30
Name
<Bz>
Description
The vector (<BX>CI,<BY>CI,<BZ>CI), where CI refers to Cloud coordinates
Units
nT
Support
SupportQuantity
Other
Parameter #31
Name
f
Description
The flag (f) to denote ability to determine handedness (H)
Support
SupportQuantity
Other
Parameter #32
Name
F
Description
The flag (F) to denote ability to determine convergence
Support
SupportQuantity
Other
Parameter #33
Name
Qo
Description
Qo, estimated Quality of the model fitting: Qo = 1, 2 and 3 for good, fair and poor, respectively. For definition see https://wind.nasa.gov/mfi/appendix.html
Support
SupportQuantity
DataQuality
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Last Updated: 2026-02-02