Recent Efforts Toward the Establishment of the Lonjsko Polje Geomagnetic Observatory

Abstract

More than ten years ago, the Geophysical Institute initiated the installation of a geomagnetic observatory in Croatia. Over the past decade, extensive surveys and studies have been conducted in order to determine the proper location for the observatory. Finally, in 2012, the observatory was established in Lonjsko Polje. This paper presents the first data recorded in the period 2012.5-2015.0. Also presented are the technical aspects and data processing techniques of this remotely operated observatory. Analysis of data quality and comparison with data from the surrounding INTERMAGNET observatories is discussed in detail. Although remote observatories cannot provide the ideal environment for magnetometers, the obtained results accentuate the potential of the new observatory to provide high-quality data. The establishment of this observatory paves the way for scientific and professional development of geomagnetism in Croatia.

A Study of Tropospheric and Ionospheric Propagation Conditions during Differential Interferometric SAR Measurements Applied on Zagreb 22 March 2020 Earthquake

“…Such values represent low ionospheric activity, with some variations towards the end of the month, and slightly higher geomagnetic activity during the acquiring of the second Sentinel-1A image. The Lonjsko polje geomagnetic observatory's (situated very close to the earthquake epicenter at coordinates 45.41 • N 16.66 • E) K index data in the periods of interest were very similar, with values of 1, 2, 2, and 3 for 11, 17, 23, and 29 March 2020, respectively [59]. The global Dst index for the observed time and dates had values of 7 nT, −10 nT, −11 nT, and −11 nT [60,61].…”

On the possibility of producing definitive magnetic observatory data within less than one year

“…Right annual averages of the same residuals presented on the left subplot maximal discrepancies between D and QD data (which can be available within a few days/weeks) rarely exceed 0.3 nT. The fact that in many cases the new method gives good results without human intervention paves the way towards automating the whole data processing chain, and towards fully automated observatories when automated absolute instruments become supplement equipment or the only absolute instrument at remote (unmanned) observatories (Korte et al 2009;Mandić et al 2016). These instruments will provide information about the absolute values of the field and variometer base values much more frequently than today.…”

Dataset of geomagnetic absolute measurements performed by Declination and Inclination Magnetometer (DIM) and nuclear magnetometer during the joint Croatian-Hungarian repeat station campaign in Adriatic region

“…After the establishment of the independent Republic of Croatia in the early 1990s, the geomagnetic field on the Croatian territory has been surveyed and monitored on the Croatian Geomagnetic Repeat Station Network, field mapping has been carried out through the Croatian Geomagnetic Network for Field Mapping (CGNFM), and finally in 2012 was established the geomagnetic observatory in Lonjsko polje (LON) [2] .…”