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De Lauretis, P. Francia, M. Vellante,U. Villante, A. Piancatelli, M. Regi |
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Title  |
ULF pulsation events in the southern polar cap |
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Conference - International - Poster |
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2008 |
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SCAR/IASC IPY Open Science Conference, July 8-11 2008, St. Petersburg, Russia |
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1130 |
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5386 |
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De Lauretis, M.; Francia, P.; Vellante, M.; Piancatelli, A.; Villante, U.; Di Memmo, D. |
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Title |
ULF geomagnetic pulsations in the southern polar cap: Simultaneous measurements near the cusp and the geomagnetic pole |
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Journal Article |
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Year |
2005 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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110 |
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Keywords |
polar cap phenomena; cusp; MHD waves and turbulence; solar wind/magnetosphere interactions; 2776 Magnetospheric Physics: Polar cap phenomena; 2706 Magnetospheric Physics: Cusp; 2784 Magnetospheric Physics: Solar wind/magnetosphere interactions; 2752 Magnetospheric Physics: MHD waves and instabilities; 2740 Magnetospheric Physics: Magnetospheric configuration and dynamics |
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During November 2003, a 1-week test campaign of ULF geomagnetic field measurements was conducted at the new Italian/French base of Concordia (Dome C, Antarctic plateau), close to the geomagnetic pole, at a corrected geomagnetic latitude of ?89°S. An analysis of these measurements is presented, together with a comparison with simultaneous measurements conducted at the Italian “Mario Zucchelli” base, at Terra Nova Bay, also located in the polar cap, but at lower latitude (?80°S). The variable solar wind and interplanetary magnetic field conditions made it possible to monitor the Pc 3–4 ULF pulsation activity under different magnetospheric conditions. For quiet conditions, the pulsation power does not show evidence for a diurnal modulation at Dome C, while at Terra Nova Bay it maximizes around local magnetic noon. This result can be interpreted in terms of the different latitude of the two stations which might be linked to different magnetospheric regions: Dome C deep in the polar cap, and Terra Nova Bay approaching the cusp around noon. Conversely, during a strong geomagnetic storm, the wave activity at the two stations becomes very similar, and major ground manifestations are driven by strong solar wind pressure pulses. The clear dependence of the pulsation frequency with the interplanetary magnetic field strength suggests that upstream waves can be the source of pulsations not only at Terra Nova Bay but also at Dome C, in the deep polar cap. We also find a clear relationship between the pulsation power and the solar wind speed which is more pronounced at Dome C, where cusp-related phenomena are not present. |
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1130 |
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American Geophysical Union |
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0148-0227 |
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IPEV @ Thierry.Lemaire @ |
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5494 |
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Cafarella L., M. De Lauretis, D. Di Mauro, P. Francia, S. Lepidi, A. Meloni, P. Palangio, A. Piancatelli, L. Santarelli, M. Vellante, U. Villante |
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Title |
ULF geomagnetic pulsations at high latitudes: the Italian contribution |
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Conference - International - Article with Reading Comitee |
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2007 |
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C-99 |
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398 |
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Proceedings of XIIth IAGA Workshop on Geomagnetic Observatory Instruments, Data Acquisition, and Processing, 19-24 June, 2006, Belsk, Poland, Publ. Inst. Geophys. Pol. Acad. Sc. |
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1130 |
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5373 |
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Cafarella L., M. De Lauretis, D. Di Mauro, P. Francia, S. Lepidi, A. Meloni, P. Palangio, A. Piancatelli, L. Santarelli, M. Vellante, U. Villante |
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Title |
ULF geomagnetic pulsations at high latitudes: the Italian contribution |
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Conference - International - Poster |
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2006 |
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XIIth IAGA Workshop on Geomagnetic Observatory Instruments, Data Acquisition, and Processing, 19-24 June, 2006, Belsk, Poland |
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1130 |
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5380 |
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Author |
Fossat Eric, Aristidi Eric, Agabi Karim, Bondoux Erick, Challita Zalpha, Jeanneaux Francois, Mekarnia Djamel, |
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Title |
Typical duration of good seeing sequences at Concordia
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Journal Article |
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2010 |
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ASTRONOMY & ASTROPHYSICS |
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517A |
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4 -4 |
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Instrumentation and Methods for Astrophysics, |
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Context: The winter seeing at Concordia is essentially bimodal, excellent or quite poor, with relative proportions that depend on altitude above the snow surface. This paper studies the temporal behavior of the good seeing sequences. Aims: An efficient exploitation of extremely good seeing with an adaptive optics system needs long integrations. It is then important to explore the temporal distribution of the fraction of time providing excellent seeing. Methods: Temporal windows of good seeing are created by a simple binary process. Good or bad. Their autocorrelations are corrected for those of the existing data sets, since these are not continuous, being often interrupted by technical problems in addition to the adverse weather gaps. At the end these corrected autocorrelations provide the typical duration of good seeing sequences. This study has to be a little detailed as its results depend on the season, summer or winter. Results: Using a threshold of 0.5 arcsec to define the “good seeing”, three characteristic numbers are found to describe the temporal evolution of the good seeing windows. The first number is the mean duration of an uninterrupted good seeing sequence: it is $\tau0=7.5$ hours at 8 m above the ground (15 hours at 20 m). These sequences are randomly distributed in time, with a negative exponential law of damping time $\tau1=29$ hours (at elevation 8 m and 20 m). The third number is the mean time between two 29 hours episodes. It is T=10 days at 8 m high (5 days at 20 m).
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908 |
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0004-6361 |
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2505 |
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Yagova, N.V.; Pilipenko, V.A.; Lanzerotti, L.J.; Engebretson, M.J.; Rodger, A.S.; Lepidi, S.; Papitashvili, V.O. |
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Title |
Two-dimensional structure of long-period pulsations at polar latitudes in Antarctica |
Type |
Journal Article |
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Year |
2004 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
109 |
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Pages |
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Keywords |
2776 Magnetospheric Physics: Polar cap phenomena; 2752 Magnetospheric Physics: MHD waves and instabilities; 2744 Magnetospheric Physics: Magnetotail; 2724 Magnetospheric Physics: Magnetopause, cusp, and boundary layers |
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Two-dimensional (2-D) statistical distributions of spectral power and coherence of polar geomagnetic variations with quasi-periods about 10 min are analyzed using data from magnetometer arrays in Antarctica. Examination of the 2-D patterns of spectral power and coherence shows the occurrence of significant variations in geomagnetic power levels but with low spatial coherence near the cusp projection and in the auroral region. At the same time, low-amplitude pulsations, which we coin Pi cap
3 pulsations, are very coherent throughout the polar cap. The region occupied by coherent Pi cap
3 pulsations is shifted toward local MLT night from the geomagnetic pole and is decoupled from the regions of auroral and cusp ULF activity. The spectral power varies with time at polar latitudes in a manner different from that at auroral latitudes. Diurnal variations of power at different stations at the same geomagnetic latitude exhibit different behavior depending on the station's position relative to geomagnetic and geographic poles. This asymmetry is shown to be partly attributed to the variations of the ionospheric conductance. The primary source of polar pulsations is probably related to intermittent magnetosheath turbulence and tail lobe oscillations, though a particular propagation mechanism has not as yet been identified. |
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905 |
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American Geophysical Union |
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0148-0227 |
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IPEV @ Thierry.Lemaire @ |
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5539 |
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Crouzet N., Guillot T., Abe L., Mékarnia D., Agabi K., Bresson Y., Bailet C., Mauclert N., Heras A., Ferruit P., Triaud A., Lagrange A., Schmider ., Giardino G., Isaak K., Kohley R., Michalik D., Foing B., Pilbratt G., Stankov A., Gondoin P., Birkmann S., O'Rourke L. |
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Title |
Two-colour photometry to search for transiting exoplanets with ASTEP at Dome C, Antarctica |
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Communication |
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2020 |
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Scar 2020 open science conference |
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Dome C in Antarctica provides exceptional conditions for photometry thanks to the continuous night during the Antarctic winter, a high clear sky fraction, low wind speeds, and a cold and dry atmosphere. The ASTEP project (Antarctic Search for Transiting ExoPlanets) aims at detecting and characterising transiting exoplanets and qualifying this site for photometry in the visible. The main instrument, a 40 cm telescope, has been designed to perform high precision photometry under the extreme conditions of the Antarctic winter and has operated at the Concordia station since 2010. It will be upgraded with two new cameras and a new camera box in order to provide simultaneous two-colour photometry and substantially increase its throughput. The new setup will be operational for the winter campaign 2021 and will allow us to discover transiting exoplanets orbiting bright stars in particular low mass exoplanets, temperate exoplanets, exoplanets around young stars, and to refine the ephemerides of exoplanets discovered by the TESS mission. These observations will provide targets for first characterisation with the CHEOPS mission and atmospheric studies with the JWST and ARIEL missions. In this talk, I will describe the science goals and the upgrade of the ASTEP telescope. |
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1066 |
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7806 |
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L. Abe, J.-P. Rivet, A. Agabi, E. Aristidi, D. Mekarnia, I. Goncalves, T. Guillot, M. Barbieri, N. Crouzet, F. Fressin, F.-X. Schmider, Y. Fantei-Caujolle, J.-B. Daban, C. Gouvret, S. Peron, P.-Y. Petit, A. Robini, M. Dugue, E. Bondoux, T. Fruth, A. Erikson, H. Rauer, F. Pont, A. Alapini, S. Aigrain, J. Szulagyi, P.-E. Blanc, A. Le Van Suu |
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Title |
Two years of polar winter observations with the ASTEP400 telescope |
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Peer-reviewed symposium |
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2012 |
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Ground-based and Airborne Telescopes IV |
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8444 |
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1764-1773 |
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The ASTEP program is dedicated to exo-planet transit search from the Concordia Station located at Dome C, Antarctica. It comprises two instruments: a fixed 10cm refractor pointed toward the celestial South Pole, and a 400mm Newton telescope with a 1x1 degree field of view. This work focuses on the latter instrument. It has been installed in November 2009, and has been observing since then during the two polar winters 2010 and 2011. After presenting the main science observing programs, we review the telescope installation, performance, and describe its operating conditions as well as the data reduction and handling strategy. The resulting lightcurves are generally very stable and of excellent quality, as shown by continuous observations of WASP-19 that we present here. |
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1066 |
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8199 |
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Genthon, C., D. Six, V. Favier, H. Gallée, O. Traullé, E. Aristidi |
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Two years of lower atmospheric boundary layer observation at Dome C, Antarctique plateau, IUGG2011, Melbourne, Australie, 28 Juin-7 Juillet 2011. |
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2011 |
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1013 |
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3685 |
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Schott J.J., Di Mauro D., Chambodut A., and Agnoletto, L. |
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Two years of continuous record of the Earth's magnetic field at Concordia station (DomeC, Antarctica). |
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2007 |
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Communication présentée à XXIV Assembly of IUGG, Pérouges, 2-13 juillet 2007. |
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905 |
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