HELIOS 1 and 2
                      Magnetic Field 6-sec Averages

Task of the HELIOS mission was the exploration of the inner heliosphere,
inside the Earth's orbit to 0.3 AU.

Helios 1 and Helios 2 were launched on December 10, 1974, and January 15, 1976,
respectively. The aphelion and perihelion distances and the orbital period were
0.99 AU, 0.31 AU, and 190 days for Helios 1 and 0.98 AU, 0.29 AU, and 187 days
for Helios 2.

The Rome-GSFC magnetic field experiment has been a joint venture of an italian 
group (University of Rome and CNR/Istituto Fisica Spazio Interplanetario, 
Frascati) and an american group of NASA/Goddard Space Fligth Center, under the 
responsibility of F. Mariani and N.F.Ness, respectively. A description of the 
experiment can be found in the NASA-GSFC report X-692-75-112 (1975),
by C. Scearce et al.
.
The instrument is a dual configuration of two tri-axial fluxgate magnetometers
operating at four different sensitivities (from 0.84 to 0.03 nT).
The time resolution, depending the operation mode, telemetry format, and 
bit rate, for most cases varied from 0.07 to 1.5 seconds.

The present data set contains six-second averages of the magnetic field
elements in solar-ecliptic (SE) spacecraft-centered coordinates.
Data are stored in files on a daily basis. File names are hNYYDDD.asc, with N
the Helios number (1 or 2), YY the year (last two digits), and DDD the day of
year (1 = January 1st). For instance, h276105.asc is the file with Helios 2
data for day 105, 1976.

For each average the format is:   (1X,I1,I2,I3,4I2,3F7.2,4F6.2).

The list of variables is:

1X
I1      Helios number (1 or 2)
I2      year (last two digits)
I3      day of year (1=jan 1st)
I2      hour (0 to 23)
I2      minute (start time)
I2      second      "
I2      number of data in the average
F7.2    Bxse  
F7.2    Byse      
F7.2    Bzse      
F6.2    B (field magnitude average)   
F6.2    st. dev. of Bxse
F6.2    st. dev. of Byse
F6.2    st. dev. of Bzse