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NEUTRON MONITOR DATA FOR JUNGFRAUJOCH AND BERN
DURING THE GROUND-LEVEL SOLAR COSMIC-RAY EVENT ON
28 October 2003

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
28 October 2003 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 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).

iii) The special neutron monitor (Buetikofer, 1988)
with 58 IGY-type counter tubes in Bern (geographic
latitude: 46.95 N; geographic longitude: 7.456 E;
altitude: 570 m).


The last complete hour (in UT) before the onset of the
particle increase at Earth was used as the baseline
time interval, i.e. 28 October 2003, 1000 - 1100 UT.

For the Jungfraujoch neutron monitors the following data
are given:

Hourly data 27 October 2003 0000 - 2400 UT
28 October 2003 0000 - 0900 UT
1-minute data 28 October 2003 0900 - 2400 UT
29 October 2003 0000 - 1200 UT
Hourly data 29 October 2003 1200 - 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), 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, BERN for
the special neutron monitor in Bern.

All counting rates of the neutron monitors were
normalized with the same correction factors as used for
the publications on our wepsite http://cosray.unibe.ch
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 0.975 0.976 1.010
Jungfraujoch
special neutron monitor 1.067 1.000 1.060 /
Bern 1.000

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. For the special
neutron monitor in Bern section 1 is AL+AR+BL+BR and section 2
is CL+CR. In contrast to the data books where the count
rates of the sections FL and FR are not taken into
account, the data in this report include all sections of
the special neutron monitor. Section 3 therefore is
DL+DR+EL+ER+FL+FR. The correction factor for
(DL+DR+EL+ER) is 1.060, whereas for (FL+FR) it is 1.000.
(For details see Buetikofer, 1988)

In the special neutron monitor in Bern the counter tubes
are placed at different positions relative to the
absorbers. Therefore different barometric pressure
coefficients were used for the pressure correction of the
count rates of the different sections. The barometric
pressure coefficients according to Buetikofer (1988) were
used. These coefficients are given in the table below.

section barometric
coefficient in
% / mmHg
AL, AR -0.975
BL, BR -0.961
CL, CR -0.962
DL, DR -0.920
EL, ER -0.948
FL, FR -0.928

The barometric pressure coefficient of -0.9557 % / mmHg
given in line 3 of the header of the standard GLE format
for the special neutron monitor in Bern corresponds to an
average barometric pressure coefficient for the total
count rate.


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
20-0067092.01 and by the International Foundation High
Altitude Research Stations Jungfraujoch and Gornergrat
(HFSJG), CH-3012 Bern, Switzerland.


References:

Buetikofer, R., Zum Wiederaufbau des
Multiplizitaetsneutronenmonitors in Bern,
Lizentiatsarbeit, Physikalisches Institut, Universitaet
Bern, 1988

Buetikofer, R., E.O. Flueckiger, Pressure Correction of
GLE Measurements in Turbulent Winds, 26th ICRC, Salt
Lake City, Conference Papers 6, 395, 1999

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.