Data Access
This data set contains hourly resolution anisotropies
in spacecraft and solar wind frames for 2.5-5 MeV/n H, He, O and Fe
nuclei, plus 5-8 MeV/n He nuclei. First-, second- and third-order
spacecraft-frame anisotropies, and the magnitude and direction angles,
relative to the mean magnetic field, of the spacecraft-frame first-order
anisotropy vectors are given. Ion spectral parameters used in anisotropy
determinations, namely spectral power law index (gamma), mean energy of
ions in sampled energy range, and ion flux at the mean energy, are given.
Many solar wind parameter averages are given, including magnetic field
magnitude and direction, solar wind density and flow speed and azimuthal
angle. Standard deviations in all hourly averages are also given. See
Tan et al, Ap.J.,661, 1297-1310, 2007, for discussions of anisotropies,
reference frames, etc. As of 10/2011, the data cover 39 1997-2006 multi-
day intervals that include energetic solar particle events. ASCII data
words are comma-separated. For a given particle event, there are
species-specific files. File naming uses the convention XX_a1s_YYYYMMDD,
where XX = H (or Hng), He2 (2.5-5 MeV/n), He5 (5-8 MeV/n), O or Fe, and
where YYYYMMDD is the day of the first record of the file. "Hng" means
hydrogen - no gamma (as obtained from IMP 8 GME data); but see the
readme file cited below on the use of EPACT/LEMT He data as providing
an alternative power law index.
Version:2.2.9
This data set contains hourly resolution anisotropies
in spacecraft and solar wind frames for 2.5-5 MeV/n H, He, O and Fe
nuclei, plus 5-8 MeV/n He nuclei. First-, second- and third-order
spacecraft-frame anisotropies, and the magnitude and direction angles,
relative to the mean magnetic field, of the spacecraft-frame first-order
anisotropy vectors are given. Ion spectral parameters used in anisotropy
determinations, namely spectral power law index (gamma), mean energy of
ions in sampled energy range, and ion flux at the mean energy, are given.
Many solar wind parameter averages are given, including magnetic field
magnitude and direction, solar wind density and flow speed and azimuthal
angle. Standard deviations in all hourly averages are also given. See
Tan et al, Ap.J.,661, 1297-1310, 2007, for discussions of anisotropies,
reference frames, etc. As of 10/2011, the data cover 39 1997-2006 multi-
day intervals that include energetic solar particle events. ASCII data
words are comma-separated. For a given particle event, there are
species-specific files. File naming uses the convention XX_a1s_YYYYMMDD,
where XX = H (or Hng), He2 (2.5-5 MeV/n), He5 (5-8 MeV/n), O or Fe, and
where YYYYMMDD is the day of the first record of the file. "Hng" means
hydrogen - no gamma (as obtained from IMP 8 GME data); but see the
readme file cited below on the use of EPACT/LEMT He data as providing
an alternative power law index.
| Role | Person | |
|---|---|---|
| 1. | PrincipalInvestigator | spase://SMWG/Person/Tycho.T.Von.Rosenvinge |
| 2. | CoInvestigator | spase://SMWG/Person/Donald.V.Reames |
| 3. | DataProducer | spase://SMWG/Person/Lun.C.Tan |
File-level access to event-specific, species-specific
ASCII files
Universal time at start of hour average
Year, month, day, hour at start of average, and
fractional day of year and fractional day of month at midpoint of
average
Spectral power law exponent
Standard deviation in spectral power law exponent
Mean energy of ions in sampled energy range
Logarithm of ion flux at mean particle energy
See Tan et al, Ap.J., 661, 1297, 2007
See Tan et al, Ap.J., 661, 1297, 2007
See Tan et al, Ap.J., 661, 1297, 2007
See Tan et al, Ap.J., 661, 1297, 2007
See Tan et al, Ap.J., 661, 1297, 2007
See Tan et al, Ap.J., 661, 1297, 2007
Bulk flow speed of energetic ion population;
see Tan et al, Ap.J., 661, 1297, 2007
Difference between the longitude angles of the ion bulk flow
velocity and the magnetic field vectors
Magnitude of ion first order anisotropy in solar
wind frame; see Tan et al, Ap.J., 661, 1297, 2007
Magnitude of ion first order anisotropy in solar
wind frame; see Tan et al, Ap.J., 661, 1297, 2007
Component of solar-wind-frame first order anisotropy
vector perpendicular to mean magnetic field
Component of solar-wind-frame first order anisotropy
vector parallel to mean magnetic field