press release #18
Magnetometric Measurements started in Armenia!
Magnetometric station LEMI-417, commissioned by Lviv center of Space
Research Institute of Ukrainian Academy of Sciences, was installed in
Nor Amberd, 2000 m above sea level (the same type of station with added
electrical field sensors will be installed at Aragats, 3200 above sea
level in September).
Operation of magnetometric station
started in July 2009. In Figure 1 we post the pattern of the first
Geomagnetic Storm detected in Nor Amberd in comparison with DST index
(geomagnetic field disturbances averaged other several magnetometers
located in middle-low latitudes). Geomagnetic activity increased to
major storm levels from 0300 - 1200 UTC on 22 July. Activity decreased
to quiet levels at all latitudes on July 26. ACE solar wind
measurements which indicated the storm conditions on 22 July were
associated with the onset of a coronal hole high-speed wind stream.
Solar wind velocities began to gradually increase early on July 22 and
eventually reached a maximum of 601 km/sec at 24/0158 UTC.
Interplanetary magnetic field (IMF) changes, associated with the onset
of the high-speed stream, included an increase in IMF Bt (peak 18 nT at
22/0533 UTC) and a sustained period of southward IMF Bz (minimum -18 nT
at 22/0703 UTC).
Figure 1. Comparison of the geomagnetic storm, detected by the new facility in Nor Amberd and DST index calculated
by Kyoto magnetic observatory (DST is measured in relative units;
Nor Amberd magnetometer - in absolute)
One-minute time series of the 3-dimensional measurements of the geomagnetic field enter the data base of the Aragats Space Environmental Center (ASEC) and will highly improve research of correlations of the geomagnetic parameters and changes of the fluxes of cosmic rays now underway at Aragats. ASEC measures neutral and charged fluxes of secondary cosmic rays (Chilingarian et.al., 2005); correlations of changes of these fluxes with geomagnetic parameters and IMF parameters measured by facilities of the ACE space station located 1.5 mln. km from Earth will assist to understand Solar influence on the Earth environments (see, for instance Bostanjyan & Chilingarian, 2009). Measurements of geomagnetic field from Nor Amberd will support forewarning of the upcoming major geomagnetic storm. Alert service planned to be provided by CRD in late 2010.
Figure 2. CRD PhD student Tigran Karapetyan examining geomagnetic field disturbances
Figure 3. CRD Postdoc Artur Reymers establishing Internet connection of the geomagnetic laboratory to CRD headquarters.
Each minute measurement of the 3 components of geomagnetic field will be send
to CRD servers for multivariate analysis and alert services.
References:
Chilingarian, A., et al., Correlated
measurements of secondary cosmic ray fluxes by the Aragats Space –
Environmental Center monitors, Nucl. Instrum. Methods Phys. Res., A543,
483-496, 2005.
N. Bostanjyan, A.Chilingarian, Cosmic Ray Intensity increases detected
by ASEC monitors during the 23rd solar activity cycle in correlation
with Geomagnetic storms, Journal of Geophysical Research, 2009, in
press.
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