The readme for this hourly solar wind magnetic
field data.
This data set was created at NSSDC by combining the
hourly, all-orbit-phases data set (73-078A-01R)
with IMP 8 bow shock crossing information to produce
this hourly, solar-wind-only data set. This data
set has annual files of hourly IMP 8 magnetic field
averages, in ASCII format.
The spacecraft position values (words 5-9), the
field intensity (word 10) and the GSE and GSM
cartesian components (words 14-18) were computed
from corresponding 15-sec values. Data for 00:00-
01:00 were used for the first hourly average of the
day. Words 11-13 were computed from the hourly
averaged GSE cartesian components. The number of
points is the number of 15-s values (themselves
averages) contributing to the hourly average. The
sigma's (standard deviations) carry no memory of
the sigma's in the 15-s averages.
The hourly averages of this data set contain only
the solar wind phase of each ~12-day IMP orbit.
Every hour is represented; those for which there
are no IMP solar wind data have fill values in their
data words.
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The words in each data record are:
WORD FORMAT Fill Value MEANING UNITS/COMMENTS
1 I5 Year 1963, 1964, etc.
2 I4 Decimal Day January 1 = Day 1
3 I3 Hour 0, 1,...,23
4 I4 999 # of points in the IMF averages
5 F6.1 999.9 X, GSE (Re)
6 F6.1 999.9 Y, GSE (Re)
7 F6.1 999.9 Z, GSE (Re)
8 F6.1 999.9 Y, GSM (Re)
9 F6.1 999.9 Z, GSM (Re)
10 F6.1 999.9 Field Magnitude Average |B| 1/N SUM |B|, nT
11 F6.1 999.9 Magnitude of Average Field Vector sqrt(Bx^2+By^2+Bz^2)
12 F6.1 999.9 Lat.Angle of Aver. Field Vector Degrees (GSE coords)
13 F6.1 999.9 Long.Angle of Aver.Field Vector Degrees (GSE coords)
14 F6.1 999.9 Bx GSE, GSM nT
15 F6.1 999.9 By GSE nT
16 F6.1 999.9 Bz GSE nT
17 F6.1 999.9 By GSM nT
18 F6 1 999.9 Bz GSM nT
19 F6.1 999.9 sigma|B| RMS Standard Deviation in average
magnitude (word 10), nT
20 F6.1 999.9 sigma B SQRT[sigma(Bx)**2 + Sigma(By)**2
+ Sigma(Bz)**2], nT
21 F6.1 999.9 sigma Bx RMS Standard Deviation in GSE
X-component average, nT
22 F6.1 999.9 sigma By RMS Standard Deviation in GSE
Y-component average, nT
23 F6.1 999.9 sigma Bz RMS Standard Deviation in GSE
Z-component average, nT
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Related data and directories:
SPDF Data and Orbits Services
NSSDC Master Catalog
NSSDC Contact: Natalia Papitashvili ,
Please acknowledge NASA's National Space Science Data Center and
Space Physics Data Facility, and the Principal Investigator
Dr Adam Szabo for data usage.
Authorizing NASA Official: Dr. R.E. McGuire, Head, SPDF, NASA Goddard Space Flight Center
301-286-7794, e-mail: Robert.E.McGuire@nasa.gov
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