NEUTRON MONITOR DATA FOR JUNGFRAUJOCH DURING THE 
   GROUND-LEVEL SOLAR COSMIC-RAY EVENT ON 14 JULY 2000
                            
            R. Buetikofer and E.O. Flueckiger 
        Physikalisches Institut, Universitaet Bern
       Sidlerstrasse 5, CH-3012 Bern, Switzerland


This report includes information on the processing and use 
of the data for the ground-level solar cosmic ray event on 
14 July 2000 obtained by the following two neutron monitors 
operated by the Cosmic Ray Group of the University of Bern:

  i)    The standard IGY neutron monitor with 18 BF3-
   counters at Jungfraujoch (geographic latitude: 46.55
   N; geographic longitude 7.98 E; effective vertical
   cutoff rigidity, Epoch 2000.0: 4.49 GV; altitude 3570
   m). This detector is an integral part of the
   worldwide network of neutron monitors, and data of
   this monitor have been published regularly since 1958
   (Debrunner et al., 1987).

 ii)    The IQSY-NM64 neutron monitor with 3 counter
   tubes at Jungfraujoch (altitude: 3475 m). This
   monitor has been in operation since 1986 
   (Debrunner et al., 1987; Schubnell, 1988).


The last complete hour (in UT) before the onset of the
particle increase at Earth was used as the baseline
time interval, i.e. 14 July 2000, 0900 - 1000 UT.

For the Jungfraujoch neutron monitors the following data
are given:

Hourly data        13 July 2000     0000 - 2400 UT
                   14 July 2000     0000 - 0900 UT
1-minute data      14 July 2000     0900 - 1600 UT
Hourly data        14 July 2000     1600 - 2400 UT
                   15 July 2000     0000 - 2400 UT

All data are presented in the "Standard Format for Cosmic 
Ray Ground-Level Event Data" as suggested by Shea et al. 
(1987), and additions according to the document "STANDARD 
FORMAT FOR COSMIC RAY GROUND-LEVEL ENHANCEMENT DATA" at 
the GLE data base. The following names were used to 
identify the different monitors: JUNGFRAUJ for the 
18-IGY and JUNGFRAU2 for the 3-NM64 neutron monitors at 
Jungfraujoch.

All counting rates of the neutron monitors were
normalized with the same correction factors as used for
the publications in the data books and for data sent to
the world data centers. The factors for the time interval
during the event are given in the following table for the
different sections of the neutron monitors.

neutron monitor             section   section   section
                            1         2         3
IGY neutron monitor         0.885     0.908     0.792
Jungfraujoch
NM64 neutron monitor        0.972     0.976     1.010
Jungfraujoch

Pressure corrected hourly averages were obtained from
pressure corrected 1-minute values. The hourly pressure
values were obtained by averaging the 1-minute pressure
readings.

Section 3 of the IGY neutron monitor at Jungfraujoch is
the central section. Section 1 is west of section 3 
(towards the building) and section 2 is east of section 3. 
In the NM64 neutron monitor Jungfraujoch section 1 is 
located toward the mountain, section 2 is the central section 
and section 3 is located toward the glacier. 

There was snow fall during all three days of this event.

The Swiss neutron monitor data may be used under the
following conditons:

(1) You agree to achnowledge the source of the data
    in any published use. Example: "Jungfraujoch
    neutron monitor data were kindly provided by the
    Cosmic Ray Group, Physikalisches Institut,
    University of Bern, University of Bern, 
    Switzerland"

(2) You agree to send a copy of any paper using these
    data to:
       Erwin Flueckiger
       Physikalisches Institut
       University of Bern
       Sidlerstrasse 5
       CH-3012 Bern / Switzerlaand

(3) You may share these data with colleagues, provided
    you inform them of these conditions. 

While the published data are accurate to the best of our
knowledge, we reserve the right to correct errors without 
notifying users.

Acknowledments: The operation of the neutron monitor is
supported by the Swiss National Science Foundation, grant
20-057175.99 and by the International Foundation High
Altitude Research Stations Jungfraujoch and Gornergrat
(HFSJG), CH-3012 Bern, Switzerland.


References:

Debrunner, H., E. Flueckiger, and M. Schubnell, Present
 and Future Activities of the Bern Cosmic Ray Group in
 the Field of Solar Neutrons, Workshop on Solar
 Neutrons, 20th ICRC, Moscow; Special Report of the A.F.
 Ioffe Physico-Technical Institute of the Academy of
 Sciences of the USSR, Leningrad, 7, 1987.

Schubnell, M., Zum Nachweis solarer Neutronen auf
 Jungfraujoch, Inauguraldissertation, Physikalisches
 Institut, Universitaet Bern, 1988

Shea, M.A., D.F. Smart, J.E. Humble, E.O. Flueckiger, L.C.
 Gentile, and M.R. Nichol, A Revised Standard Format for
 Cosmic Ray Ground-Level Event Data, 20th ICRC, Moscow,
 Conference Papers 3, 171, 1987.