On the feasibility of promptly producing quasi-definitive magnetic observatory data

Details On the feasibility of promptly producing quasi-definitive magnetic observatory data On the feasibility of promptly producing quasi-definitive magnetic observatory data

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ep%26s...62e...5p&link_type=abstract

Earth, Planets and Space, Volume 62, Issue 2, p. e5-e8.

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Magnetic observatories currently distribute two types of data: preliminary data, available in less than 72 hrs in the case of INTERMAGNET observatories, and definitive baseline-corrected data, produced only once a year. Several users and groups of users have expressed the need for baseline-corrected observatory data produced in a continuous manner. The main applications for such quasi-definitive data include geomagnetic field modeling and the calculation of geomagnetic activity indices. We present an original method for producing quasi-definitive data at the end of each calendar month using temporary baselines. Preliminary and definitive data at nine INTERMAGNET observatories are used to test this method, simulating the production of quasi-definitive data throughout the year 2008. The temporary baselines obtained are very close to the definitive ones, except during the last few days of each time interval. The means and standard deviations of the differences between quasi-definitive and definitive data do not exceed 0.3 nT, well below the current INTERMAGNET standard of accuracy. This result demonstrates the feasibility of promptly producing quasi-definitive data at most magnetic observatories of INTERMAGNET type.

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