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Author |
Sittler, B., O. Gilg, and I. Hanski |
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Title |
Lemming cycles in the grip of climate change – Insights from an ongoing long term study in North East Greenland |
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Conference - International - Communication |
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2014 |
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Mammals of Northern Eurasia: Life in the Northern Latitudes, RUSSIAN ACADEMY OF SCIENCES, Surgut State University, April 6-10, 2014 |
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1036 |
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6263 |
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Aebischer, A., J. Lang, B. Sittler, and O. Gilg |
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Title |
Post-breeding movements as assessed via satellite telemetry of Greenlandic owls |
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Conference - International - Communication |
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2014 |
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3rd International Snowy Owl Working Group. Russian Academy of Science, Oural Branch, Salekhard-Yamal, Russia, 2-6 March |
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1036 |
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6262 |
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Author |
Gilg, O., B. Sittler, J. Lang, and A. Aebischer |
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Title |
Lemming-Owl interactions as assessed in the long term studies on Traill and Hochstetter, Greenland |
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Conference - International - Communication |
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2014 |
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3rd International Snowy Owl Working Group. Russian Academy of Science, Oural Branch, Salekhard-Yamal, Russia, 2-6 March |
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1036 |
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6261 |
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Lang, J., B. Sittler, A. Aebischer, and O. Gilg |
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Title |
Capturing adult Snowy Owls: A review of published methods and some experiences from Greenland |
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Conference - International - Communication |
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2014 |
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3rd International Snowy Owl Working Group. Russian Academy of Science, Oural Branch, Salekhard-Yamal, Russia, 2-6 March |
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1036 |
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yes |
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6260 |
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Author |
Sittler, B., A. Aebischer, J. Lang, and O. Gilg |
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Title |
Assessment of the present status of the Snowy Owl in Greenland |
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Conference - International - Communication |
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2014 |
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3rd International Snowy Owl Working Group. Russian Academy of Science, Oural Branch, Salekhard-Yamal, Russia, 2-6 March |
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1036 |
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yes |
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6259 |
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Author |
Schull Q, Reichert S, Stier A, Zahn S, Bize P, Robin JP, Massemin S Criscuolo F and V. Viblanc |
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Title |
What can telomeres tell us about life-history trade-offs in king penguins? Diversity in Telomere Dynamics Workshop, Nov 17-19, Drymen, Scotland UK |
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Conference - International - Communication |
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2014 |
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119 |
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6258 |
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Ropert-Coudert Y, Kato A, Guinet C |
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Title |
Bio-logging and polar science: Fast friends in fast ice! 10èmes journées scientifiques du CNFRA, Rennes, France, 26-27 May 2014 (invited speaker). |
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Conference - National - Communication |
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2014 |
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1091 |
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6257 |
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Author |
Chadid, Merieme and Preston George |
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Title |
Atmospheric dynamics in RR Lyrae stars: a high-resolution spectroscopic survey |
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Journal Article |
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Year |
2013 |
Publication |
Monthly Notices of the Royal Astronomical Society |
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434 |
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552-573 |
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We present a first detailed atmospheric dynamics study of 11 RRab stars: six Blazhko stars – RR Lyr, AS Vir, BS Aps, CD Vel, UV Oct and V1645 Sgr, and five non-Blazhko stars – DT Hya, WY Ant, XZ Aps, Z Mic and RV Oct. 32 hundred high-resolution spectra of these RRab stars were collected, during their pulsation periods and the Blazhko cycles, with the du Pont 2.5-m telescope at the Las Campanas Observatory and the 1.5-m telescope at the Haute Provence Observatory. We derived the dynamical parameters: dynamical accelerations, radius variations, rise time, shock amplitudes, full width at half-maximum (FWHM) and their variation during the Blazhko modulation. We find that, rise time excepted, these dynamical parameters are anticorrelated with change in instantaneous pulsation period during the Blazhko cycle. We detected a new bulge phenomenon in the radial velocity curve of Blazhko and non-Blazhko stars of our sample and we discuss newly detected redshifted Hα emission and its evolution during declining light. A new bump in the light curve is also detected: the lump. We associate the bulge phenomenon, lump and the redshifted emission with a new post-maximum shock wave ShPM. The bulge phenomenon and lump vary from star to star and with phase during Blazhko cycles of individual stars. We suspect but cannot prove irregularity from cycle to cycle in the radial velocity and FWHM curves of non-Blazhko stars. Finally, we discuss the origin of the Blazhko effect, giving a new empirical side for further theoretical models. |
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1096 |
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0035-8711 |
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6255 |
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Author |
McCoy, K.D. & Boulanger, N. (editors) |
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Title |
Tiques et maladies à tiques : Biologie, écologie évolutive, épidémiologie. IRD Editions. |
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Book Whole |
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2013 |
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1151 |
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6249 |
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Chambodut Aude, Marchaudon Aurélie, Lathuillère Chantal, Menvielle Michel, Foucault Etienne, |
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Title |
New hemispheric geomagnetic indices with 15 min time resolution |
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Journal Article |
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Year |
2015 |
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Journal of Geophysical Research: Space Physics |
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0148-0227 |
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120 |
Issue |
11 |
Pages |
9943-9958 |
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geomagnetic activity, 15 min time resolution, magnetic storms and substorms, planetary and hemispheric indices, subauroral latitudes, 1739 Solar/planetary relationships, 1964 Real-time and responsive information delivery, 4305 Space weather, |
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New subauroral 15 indices are proposed. They are based on a simple reproducible algorithm which relies on an as dense as possible network of magnetic observatories in each hemisphere. At first, the variation with time of local geomagnetic activity is determined at each magnetic station. Gathering all obtained stations' precomputed values, a normalization with corrected geomagnetic latitude is determined. Then, for each 15 min interval, magnetic activity on the horizontal component is averaged out over 15 min and corrected using this normalization, before a spline modeling of the longitudinal variation in each hemisphere is applied. Hemispheric and planetary 15 min indices are then computed by arithmetic means. Preliminary statistical results, from probability distribution function over a solar cycle and superposed epoch analysis during storms conditions, show, by comparison with am geomagnetic index series, that new 15 indices are reliable in describing subauroral magnetic activity. These new indices will suit any future user, allowing either to choose the spatial description (planetary versus hemispheric) and/or to choose the temporal resolution, knowing unambiguously all their strengths and caveats. |
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2169-9402 |
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6228 |
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