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V. Korepanov, A. Marusenkov, A. Chambodut, J.-J. Schott. (2010). Observatory magnetometer in-situ calibration. Bachelor's thesis, , .
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V. Jomelli, D. Verfaillie, A. Gilbert, V. Favier. (2012). Rapport de mission GLACIOCLIM-KESAACO.
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V. Haberle, A. Marchaudon, A. Chambodut, P.-L. Blelly. (2022). Direct Determination of Geomagnetic Baselines During Quiet Periods for Low- and Mid-Latitude Observatories (Vol. 127).
Abstract: The geomagnetic field is composed of a variety of sources that act on a wide range of timescales and amplitudes. The separation of magnetic storm effects from quiet variations is needed to accurately quantify impacts of space weather events. The extraction of such quiet contributions within geomagnetic measurements is achieved by the determination of baselines, which, ideally, is done by a simple algorithm which captures quiet sources suitably well, while being applicable to an extensive network of magnetic observatories independent of the period of time. In this work, we apply signal filtering techniques on the horizontal components of geomagnetic field measurements from low- and mid-latitude observatories to determine baselines. The variations within the baseline are investigated for magnetically quiet periods between 1991 and 2019, focusing on long-term trends, seasonal and local time dependencies, and day-to-day variability. The analysis confirms that the contributing quiet sources include the secular variation and the solar quiet (Sq) current system. The non-negligible day-to-day variability, that is typical for Sq in low- and mid-latitudes, is embedded within the baseline. Thus, the filter approach extracts quiet magnetic field variations well. Comparisons with other baseline methods show good agreements. We conclude that the filter approach can be used to determine baselines automatically during magnetically quiet periods without the need of further apriori information and is applicable on a wide network of magnetic observatories. It marks the first step for deriving magnetic indices for (near) real-time space weather applications.
Keywords: magnetic baseline magnetic observatory data quiet geomagnetic field Sq current
Programme: 139
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. (2016). Atmospheric drying as the main driver of dramatic glacier wastage in the southern Indian Ocean (Vol. 6). Bachelor's thesis, , .
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V. A. Viblanc, Q. Schull, F. Stephen Dobson P. Bize & J-P. Robin. (2015).
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V. A. Viblanc, B. Gineste, J-P Robin, R Groscolas. (2016). Breeding status affects the hormonal and metabolic response to acute stress in a long-lived seabird, the king penguin. General and comparative endocrinology, 236, 139–145.
Abstract: Stress responses are suggested to physiologically underlie parental decisions promoting the redirection of behaviour away from offspring care when survival is jeopardized (e.g., when facing a predator). Besides this classical view, the “brood-value hypothesis” suggests that parents’ stress responses may be adaptively attenuated to increase fitness, ensuring continued breeding when the relative value of the brood is high. Here, we test the brood-value hypothesis in breeding king penguins (Aptenodytes patagonicus), long-lived seabirds for which the energy commitment to reproduction is high. We subjected birds at different breeding stages (courtship, incubation and chick brooding) to an acute 30-min capture stress and measured their hormonal (corticosterone, CORT) and metabolic (non-esterified fatty acid, NEFA) responses to stress. We found that CORT responses were markedly attenuated in chick-brooding birds when compared to earlier stages of breeding (courtship and incubation). In addition, NEFA responses appeared to be rapidly attenuated in incubating and brooding birds, but a progressive increase in NEFA plasma levels in courting birds suggested energy mobilization to deal with the threat. Our results support the idea that stress responses may constitute an important life-history mechanism mediating parental reproductive decisions in relation to their expected fitness outcome.
Programme: 119
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. (2018). Bachelor's thesis, , .
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Utaud, Cachier, Nguyen & Dupolessy J.C. (1995).
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Ursule N. (2012).
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Unnikrishnan A. S., A. Matthews, M. Gravelle, L. Testut, T. Aarup, P. L. Woodworth and B. A. Kumar. (2019). Tide gauges. In: Beal, Lisa M.; Vialard, Jérôme; Roxy, Mathew K., (eds.) Full Report. IndOOS-2: A roadmap to sustained observations of the Indian Ocean for 2020-2030.
Abstract: Tide gauge measurements provide data for routine tidal predictions in ports as well as for extreme events such as storm surges and tsunamis. Along with satellite altimeter measurements, tide gauges also provide measurements used for sea-level rise estimates. This is particularly important for impact assessment in low-lying coastlines of south Asia as well as islands such as the Maldives in the Indian Ocean.
Programme: 688
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