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NEUTRON MONITOR DATA FOR JUNGFRAUJOCH AND BERN

DURING THE GROUND-LEVEL SOLAR COSMIC-RAY EVENT ON 29 SEPTEMBER 1989



H. Debrunner, E.O. Flckiger, F. Golliez, R. Btikofer, W. Scuntaro
and G. Sebor
Physikalisches Institut, Universitt Bern
Sidlerstrasse 5, CH-3012 Bern, Switzerland



This report contains the data for the ground-level solar cosmic ray event
on 29 September 1989 obtained by the following three 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 1980.0: 4.63
GV; altitude 3550 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 is operating since 1986 (Debrunner
et al., 1987; Schubnell, 1988).

iii) The special neutron monitor (Btikofer, 1988) with 58 IGY-type
counter tubes in Bern (geographic latitude: 46.95 N; geographic
longitude: 7.45 E; altitude: 570 m).

The following data are given for the Jungfraujoch neutron monitors:

Hourly data 28 September 1989 0000 - 2400 UT
29 September 1989 0000 - 1000 UT

5-minute data 29 September 1989 1000 - 1100 UT

1-minute data 29 September 1989 1100 - 1500 UT

5-minute data 29 September 1989 1500 - 2400 UT

Hourly data 30 September 1989 0000 - 2400 UT

For the Bern neutron monitor, the same data are given with the difference
that the small-time data include 5-minute values only. All data are
presented in the "Standard Format for Cosmic Ray Ground-Level Event Data"
as suggested by Shea et al., 1987. The following names were used to
identify the different monitors: JUNGFRAUJ for the IGY and JUNGFRAU2 for
the 3-NM64 neutron monitor at Jungfraujoch, BERN for the special neutron
monitor in Bern.



This work has been supported by the Swiss National Science Foundation,
grant NF 2000-005285.




References:
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Btikofer, R., Zum Wiederaufbau des Multiplizittsmonitors in Bern,
Lizentiatsarbeit, Physikalisches Institut, Universitt Bern, 1988

Debrunner, H., E. Flckiger, 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, Universitt Bern, 1988

Shea, M.A., D.F. Smart, J.E. Humble, E.O. Flckiger, 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.