1. The SEGMA array: current status
M. Vellante
Physics Department, University of L’Aquila, Italy
ULTIMA Meeting
Tsukuba, Japan
14 November 2008 1

2. SEGMA: South Europe GeoMagnetic Array
Cooperating institutions:
University of L’Aquila, Italy
Space Research Institute (IWF), Graz, Austria
Geodetic and Geophysical Research Institute, Sopron, Hungary
Geophysical Institute, Sofia, Bulgaria 2

3. Map of the recording stations of the SEGMA array
NCK
CST
RNC
PAG
AQU
Map of the recording stations of the SEGMA array 3

4. SEGMA array, coordinates of the recording stations
Geograph.
Coord.
CGM L
Start of operation
Magnetometer type
Nagycenk
(NCK)
47.63 N E
42.79 N E
1.89
1999
fluxgate
Castello Tesino
(CST)
46.05 N
11.65 E
40.84 N E
1.78
2000
Ranchio
(RNC)
43.97 N
12.08 E
38.28 N E
1.65
2001
L’Aquila
(AQU)
42.38 N
13.32 E
36.33 N E
1.57
1985
fluxgate,
induction
Panagyurishte
(PAG)
42.51 N
24.18 E
37.02 N E
1.60
2003 4

5. Main features of the fluxgate instrument and data acquisition:
0.01 nT resolution
Max. data rate 64 vectors/sec
Standard final sampling rate: 1Hz
Absolute time via GPS receiver
Check operations and data recovery made frequently at AQU, NCK and PAG. Once every 1-2 months at CST and RNC. 5

6. 6

7. 7

8. - user defined magnetograms:
From the WEB site of SEGMA (
it is possible to get:
- user defined magnetograms:
- cross-phase spectra (daily and monthly vision): 8

9. Scientific objectives
General purpose:
Investigation of the dynamical features of the solar wind – magnetosphere interaction.
Ground support to space missions.
Specific objectives:
Understanding of generation mechanisms of ULF waves in the magnetosphere,
relation with solar wind conditions.
Understanding of propagation characteristics of ULF waves,
transformation they undergo in the magnetosphere (resonances) and
in the transmission through the ionosphere.
Study of connection between Pi2 pulsations and geomagnetic substorms.
Monitoring of plasma mass density in the plasmasphere and ionosphere by means of
detection of field line resonances. 9

10. Thank you for your attention10

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