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E.T. MATVEYEVA, R.V.Shchepetnov

Сatalogue of geomagnetic pulsations of Pc1 type on observation data at
the Antarctic Observatory Mirny

Geophysical Observatory Borok, Institute of Physics of the
Earth RAS, Russia

The catalogue is based on the analysis of long-term and continuous
observations of pulsations such as Pс1 on the Antarctic Observatory Mirny(
? =66.50 њ S, ? =93.00 њ E; ? =76.975 њ S, ? = 146.87 њ E; L=19.6) since
July 1957. Uniqueness of these observations can be explained both by
their duration and location of Observatory Mirny crossing
region of the projection of day time polar cusp.
The registration of pulsations in the Pc1 range was conducted from July
1957 by a terrestrial currents installation. The physical value
registered by a terrestrial currents installation is an alternating
potential between the two points on the Earth surface. As it is known this
value depends on a geoelectric structure at the observation point and then
the intensity (amplitude) of Pc1 pulsations may be presented in the
relative units.
According to our method Pc1 pulsations were divided into 4 categories:
A - very intensive.
B - intensive.
C - weak intensive.
C?- traces of Pc1.
The following characteristics are given for Pc1 pulsations in the
catalogue:
1. The date.
2,3. Time of the beginning and the end of Pc1 pulsations in UT with
precision of 1 minute.
4. The period of Pc1 in seconds (Ts) is determinated as averaged
prevailing in the given time interval. Two values T divided by semicolon,
for example 0.5;1.0 indicate the simultaneous presence of two oscillation
regimes of Pc1 in the whole time interval or in a part of it. If the
pulsations with different periods among which it is difficult to
distinguish the dominant ones in given time interval the period range is
indicated for example 1.5-2.0. If the Pc1 period decreases (increases) for
the time interval the period range is for example 2.0-1.5 (1.5-2.0).
5. The intensity of Pc1 is characterised by the averaged amplitude with
categories A, B, C, C?. If pulsations of different intensity are present on
the records during the analysed period then they are characterised by a
dual index A-B, C-C?, etc).
6. The type of pulsations. According to the morphological features the
Pc1 are divided into two types:
Pc1s - series of pulsations lasting from several minutes to several
houres (s - serie).
Pc1b - bursts of Pc1 lasting 1-5 minutes (b - burst).
7. Notes. In this column the information is given about: the period when
the registration was not carried out (n/r- no registration); the intervals
of naturally disturbed records when it is difficult to reveal the Pc1
pulsations (disturbed); the intervals of noise disturbance (noise).
The catalogue may be of interest for specialists concerned with the
different aspects of solar-terrestrial interactions the physics of
magnetosphere or the questions of instabillity of outer space plasma.
Moreover the geomagnetic pulsations with frequencies close the human
biorhythms (heart contractions, biorhythms of brain etc) may be used for
medical-biological investigations decision of questions of geophysical
ecology etc.
We thank the technical assistants of Geophysical Observatory Borok
L.I.Senina and G.A.Mironova for their participating in processing of
primary data.
The all remarks and offers concerning to catalogue and also the possible
inquires about Pc1 not being in catalogue may be directed to:
Dr. E. T. Matveyeva and Dr. R.V. Shchepetnov
Geophysical Observatory Borok
Borok, Nekouz, Yaroslavl, 152742 Russia.
E-mail: emma@borok.yar.ru