Wind SWE Key Parameter data: proton density, thermal speed, flow velocity vectors, and spacecraft position vectors. Various versions differ slightly from each other. The version at MIT has flow velocity vectors experessed bby using Geocentric Solar Ecliptic, GSE, Cartesian and spherical representations and GSE Cartesian position vectors. The version available via nssdcftp and FTPBrowser has temperature instead of thermal speed and has no flow direction angles. The CDAWeb version has flow velocity and spacecraft position vectors in both GSE and Geocentric Solar Magnetospheric, GSM, coordinates, flow dynamic pressure, NmV^2, and velocity and density quality flags. The data were progressively despiked in passing from CDAWeb to MIT to nssdcftp/FTPBrowser.
Use of the Quality Variables:
Quality flags are set in the analysis program that generates the KP data. Previous descriptions of their meaning were out of date.
Good data is indicated by a quality flag equal to 0.
The quality flags for each parameter are given as integers 4 bytes long, integer*4.
The individual bits for each quality value are set or cleared in the analysis code by adding or subtracting a power of 2 as follows. To set the first bit, add 1, the second bit, add 2, the third bit, add 4, the fourth bit, add 8, and so on. See the table below.
+------------------------------------------------------------------------------------------------------------------------------+
| Bit | Set Value | MEANING |
|------------------------------------------------------------------------------------------------------------------------------|
| 1 | 1 | Three point parabolic fits to proton peaks were not attempted. |
| 2 | 2 | Non-linear least squares fit was not attempted. |
| 3 | 4 | Three point parabolic fits to proton peaks failed. |
| 4 | 8 | Non-linear least squares fit failed. |
| 5 | 16 | Alpha parameters not valid since the non-linear least squares fit was done for protons only. |
| | | Not enough good energy channels to do simultaneous alpha fit. This value applies to iqual_core(5) only. |
| 6 | 32 | Analysis code unable to get good value for spin period. |
| 7 | 64 | SWE instrument in mode 1, calibration state mode. Key parameters are produced in mode 1, science mode. |
| 8 | 128 | Three point fits done for cup 1 only. Split collector ratio of currents used to get the north/south angle. |
| | | Either cup 2 turned off, or cup 2 densities were low indicating noise associated with vibration. |
| 9 | 256 | Fewer than ten fc_blocks in spectrum. Analysis skipped. |
| 10 | 512 | Alpha particle non-linear fit produced values of density and thermal speed that do not seem reasonable. |
| 11 | 1024 | Three point parabolic fits to proton peaks done for cup 2 only. Probably Cup 1 is turned off. |
| | | The ratio of currents on split collectors used to get north/south angle. |
| 12 | 2048 | Single width windows. Delta E over E 6.5% instead of the default 13%. |
| 13 | 4096 | Tracking mode operation. |
| 14 | 8192 | Limited tracking mode scan, not a full scan. |
+------------------------------------------------------------------------------------------------------------------------------+
Particular flag settings:
+-------------------------------------------------------------------------------------------+
| Flag Value | Meaning |
|-------------------------------------------------------------------------------------------|
| 4098 | Tracking mode operation is full scan (4096) and No non-linear fits (2) |
| 14338 | Tracking mode operation is full scan (4096) and Limited tracking mode (8192) |
+-------------------------------------------------------------------------------------------+
Comments:
For the complete guide to the quality flag values see https://cdaweb.gsfc.nasa.gov/wind_swe_quality.html.
Note that this SPASE Numerical Description only describes the MESSENGER Magnetometer data stored in Common Data Files. Other links to Wind SWE data in non CDF format are listed in the following table:
+--------------------------------------------------------------------------------------------------------------------------------------------+
| SPASE Repository Resource ID | Data Source | Data Access URL |
|--------------------------------------------------------------------------------------------------------------------------------------------|
| SMWG/Repository/MIT_CSR | ASCII via ftp from MIT | ftp://space.mit.edu/pub/plasma/wind/kp_files/ |
| SMWG/Repository/NASA/GSFC/SPDF | ASCII via ftps from SPDF | ftps://spdf.gsfc.nasa.gov/pub/data/wind/swe/ascii/swe_kp_unspike/ |
| SMWG/Repository/NASA/GSFC/SPDF | ASCII via https from SPDF | https://spdf.gsfc.nasa.gov/pub/data/wind/swe/ascii/swe_kp_unspike/ |
| SMWG/Repository/NASA/GSFC/SPDF | Subset, plot and list via FTPBrowser | https://omniweb.gsfc.nasa.gov/ftpbrowser/wind_swe_kp.html |
+--------------------------------------------------------------------------------------------------------------------------------------------+
Version:2.3.2
Wind SWE Key Parameter data: proton density, thermal speed, flow velocity vectors, and spacecraft position vectors. Various versions differ slightly from each other. The version at MIT has flow velocity vectors experessed bby using Geocentric Solar Ecliptic, GSE, Cartesian and spherical representations and GSE Cartesian position vectors. The version available via nssdcftp and FTPBrowser has temperature instead of thermal speed and has no flow direction angles. The CDAWeb version has flow velocity and spacecraft position vectors in both GSE and Geocentric Solar Magnetospheric, GSM, coordinates, flow dynamic pressure, NmV^2, and velocity and density quality flags. The data were progressively despiked in passing from CDAWeb to MIT to nssdcftp/FTPBrowser.
Use of the Quality Variables:
Quality flags are set in the analysis program that generates the KP data. Previous descriptions of their meaning were out of date.
Good data is indicated by a quality flag equal to 0.
The quality flags for each parameter are given as integers 4 bytes long, integer*4.
The individual bits for each quality value are set or cleared in the analysis code by adding or subtracting a power of 2 as follows. To set the first bit, add 1, the second bit, add 2, the third bit, add 4, the fourth bit, add 8, and so on. See the table below.
+------------------------------------------------------------------------------------------------------------------------------+
| Bit | Set Value | MEANING |
|------------------------------------------------------------------------------------------------------------------------------|
| 1 | 1 | Three point parabolic fits to proton peaks were not attempted. |
| 2 | 2 | Non-linear least squares fit was not attempted. |
| 3 | 4 | Three point parabolic fits to proton peaks failed. |
| 4 | 8 | Non-linear least squares fit failed. |
| 5 | 16 | Alpha parameters not valid since the non-linear least squares fit was done for protons only. |
| | | Not enough good energy channels to do simultaneous alpha fit. This value applies to iqual_core(5) only. |
| 6 | 32 | Analysis code unable to get good value for spin period. |
| 7 | 64 | SWE instrument in mode 1, calibration state mode. Key parameters are produced in mode 1, science mode. |
| 8 | 128 | Three point fits done for cup 1 only. Split collector ratio of currents used to get the north/south angle. |
| | | Either cup 2 turned off, or cup 2 densities were low indicating noise associated with vibration. |
| 9 | 256 | Fewer than ten fc_blocks in spectrum. Analysis skipped. |
| 10 | 512 | Alpha particle non-linear fit produced values of density and thermal speed that do not seem reasonable. |
| 11 | 1024 | Three point parabolic fits to proton peaks done for cup 2 only. Probably Cup 1 is turned off. |
| | | The ratio of currents on split collectors used to get north/south angle. |
| 12 | 2048 | Single width windows. Delta E over E 6.5% instead of the default 13%. |
| 13 | 4096 | Tracking mode operation. |
| 14 | 8192 | Limited tracking mode scan, not a full scan. |
+------------------------------------------------------------------------------------------------------------------------------+
Particular flag settings:
+-------------------------------------------------------------------------------------------+
| Flag Value | Meaning |
|-------------------------------------------------------------------------------------------|
| 4098 | Tracking mode operation is full scan (4096) and No non-linear fits (2) |
| 14338 | Tracking mode operation is full scan (4096) and Limited tracking mode (8192) |
+-------------------------------------------------------------------------------------------+
Comments:
For the complete guide to the quality flag values see https://cdaweb.gsfc.nasa.gov/wind_swe_quality.html.
Note that this SPASE Numerical Description only describes the MESSENGER Magnetometer data stored in Common Data Files. Other links to Wind SWE data in non CDF format are listed in the following table:
+--------------------------------------------------------------------------------------------------------------------------------------------+
| SPASE Repository Resource ID | Data Source | Data Access URL |
|--------------------------------------------------------------------------------------------------------------------------------------------|
| SMWG/Repository/MIT_CSR | ASCII via ftp from MIT | ftp://space.mit.edu/pub/plasma/wind/kp_files/ |
| SMWG/Repository/NASA/GSFC/SPDF | ASCII via ftps from SPDF | ftps://spdf.gsfc.nasa.gov/pub/data/wind/swe/ascii/swe_kp_unspike/ |
| SMWG/Repository/NASA/GSFC/SPDF | ASCII via https from SPDF | https://spdf.gsfc.nasa.gov/pub/data/wind/swe/ascii/swe_kp_unspike/ |
| SMWG/Repository/NASA/GSFC/SPDF | Subset, plot and list via FTPBrowser | https://omniweb.gsfc.nasa.gov/ftpbrowser/wind_swe_kp.html |
+--------------------------------------------------------------------------------------------------------------------------------------------+
| Role | Person | StartDate | StopDate | Note | |
|---|---|---|---|---|---|
| 1. | PrincipalInvestigator | spase://SMWG/Person/Keith.W.Ogilvie | |||
| 2. | CoInvestigator | spase://SMWG/Person/Alan.J.Lazarus | |||
| 3. | DataProducer | spase://SMWG/Person/Justin.C.Kasper | |||
| 4. | MetadataContact | spase://SMWG/Person/Robert.M.Candey | |||
| 5. | MetadataContact | spase://SMWG/Person/Lee.Frost.Bargatze |
Wind overview web page with news updates and information about new data product releases, hosted by NASA GSFC
Wind spacecraft general instrument web page with links to data, documentation, and home pages for all instruments, hosted by NASA GSFC
Wind spacecraft general instrument web page with brief descriptions for data sources from all instruments, hosted by NASA GSFC
Wind Solar Wind Experiment, SWE, Instruments, History, and Data Products web page, hosted by NASA GSFC
General information concerning the Wind, Solar Wind Experiment, SWE, instrument
Wind Magnetic Field Instrument, MFI, and Solar Wind Experiment, SWE, Key Parameter data access and plotting web page with selectable overplotting of DSCOVR data and links to CDF data directories, hosted by NASA GSFC
Wind Solar Wind Experiment, SWE, web page hosted by the Massachusetts Institute of Technology Space Plasma group. Since the Summer of 2015, the responsibility for Wind plasma data has been assumed by the Harvard Smithsonian Astrophysics Lab.
Wind Solar Wind Experiment, SWE, Instrument description web page hosted by the Massachusetts Institute of Technology Space Plasma group
Ogilvie, K.W., D.J. Chornay, R.J. Fritzenreiter, F. Hunsaker, J. Keller, J. Lobell, G. Miller, J.D. Scudder, E.C. Sittler, Jr., R.B. Torbert, D. Bodet, G. Needell, A.J. Lazarus, J.T. Steinberg, J.H. Tappan, A. Mavretic, and E. Gergin, SWE, a comprehensive plasma instrument for the Wind spacecraft, Space Sci. Rev., 71, 55-77, 1995, DOI: 10.1007/BF00751326
Wind Solar Wind Experiment, SWE, Key Parameter Readme file, hosted by the Massachusetts Institute of Technology, MIT
Access to Data in CDF Format via ftp from SPDF
Access to Data in CDF Format via http from SPDF
Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb
Web Service to this product using the HAPI interface.
Epoch Time Tags, centered
Time Interval, half interval, delta time from center time start/finish to sample data for parameters
Time in PB5 format: Year, Day, and Milliseconds of Day
Post Gap Flag: 0=No gap immediately prior to this record, for other values: see guidelines
Solar Wind Experiment, SWE, Instrument Mode
Spacecraft Position, Geocentric Solar Ecliptic, GSE, Cartesian coordinates
Spacecraft Position, Geocentric Solar Magnetospheric, GSM, Cartesian coordinates
Spacecraft Position, Geocentric Radial Distance, R
Data Quality Flag, overall: 0=Good, 1=Bad
Data Quality Flag, Velocity, V: 0=OK, 2=Caution, 130=Caution, all other values=Not valid
Data Quality Flag, Proton Thermal Speed, Vth: 0=OK, 2=Caution, 130=Caution, all other values=Not valid
Data Quality Flag, Proton Density, Np: 0=OK, 2=Caution, 130=Caution, all other values=Not valid
Data Quality Flag, Alpha Particle to Proton Number Density Ratio, Na/Np: 0=OK, All values greater than zero=Not valid
Solar Wind Velocity Vector, Geocentric Solar Ecliptic, GSE, Cartesian coordinates
Solar Wind Velocity Vector, Geocentric Solar Magnetospheric, GSM, Cartesian coordinates
Solar Wind Ion Bulk Flow Vector, Geocentric Solar Ecliptic, GSE, spherical coordinates, speed magnitude, E/W flow positive from the west of the Sun, N/S flow positive from the south of the Sun
Solar Wind Thermal Speed, Vth, sqrt(2kT/M), most probable
Solar Wind Proton Number Density, scalar
Alpha Particle Density Percentage