The VIRGO project is a physics experiment; its aim is the detection of gravitational waves. ... It has not yet been possible to detect directly the gravitational waves: it remains one of the major challenges of experimental physics. ... Interferometric antennas for gravitational waves Gravitational waves distort space-time: along two perpendicular directions, the distances between fixed points will increase (resp. decrease), at the arrival of a gravitational wave. ... Publications from our Group . ...

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The leaning tower of Pisa . ... The velocity of a ball dropped from a high place increases each second by a constant amount, usually denoted by the small letter g (for gravity). ... For the falling ball in the preceding example, after t seconds that would be . ... If in addition the ball is also given at the start a horizontal velocity w , its horizontal motion continues unimpeded, advancing a distance w each second, even while the ball is falling (air resistance is now ignored). ...

... The Arecibo 430 MHz radar uses incoherent scatter to determine the characteristics of the ionosphere. It is part of a chain of incoherent scatter radars operated by the Upper Atmospheric Facilities program of the National Science Foundation with strong links to the CEDAR program and the National Space Weather program. ... The Arecibo radar is extremely powerful and sensitive; it is capable of making very accurate measurements of many ionospheric parameters. ...

Next: Related Table Commands Up: Multivariate Analysis Methods Previous: Discriminant Analysis . Correspondence Analysis may be described as a PCA in a different metric (the metric replaces the usual Euclidean metric). ... While PCA is particularly suitable for quantitative data, CA is recommendable for the following types of input data, which will subsequently be looked at more closely: frequencies, contingency tables, probabilities, categorical data, and mixed qualitative/categorical data. ...

... THE SIMPLEST MODEL. ... 13, Moscow 119992, Russia E-mail: san@sai.msu.ru Abstract: The analysis of the simplest model shows that an asteroid ­ rubble pile evolves, depending on the parameter V2d (where V is the average velocity of fragments and d is the average distance between fragments), either as a conglomerate of "independent mutually gravitating clusters" (when V2d < fm, where f is the gravitational constant and m is the average mass of a fragment) or as a "receding cluster" (when V2d > fm). ...

Please enter the lightcurve file name and period search parameters: . Lightcurve file: . ... Apply the Heliocentric correction and convert all dates to Terrestrial Time (TT)? ... Also, the Heliocentric correction cannot be applied to such lightcurves. ... This period search service is also available at the mirror sites: Mirror 1 , Mirror 2 , Mirror 3 , Mirror 4 . You may download the latest source code distribution and install the period search service at your own web server. ...

THE STUDY OF THE PIONEER ANOMALY THE STUDY OF THE PIONEER ANOMALY The Pioneer Anomaly : Effect, New Data and New Investigation Slava G. Turyshev Jet Propulsion Laboratory, California Institute of Technology Seminar at the Sternberg Astronomical Institute Moscow State University, Moscow, 6 February 2007 1 THE STUDY OF THE PIONEER ANOMALY THE STUDY OF THE PIONEER ... Are they relevant to the Pioneer anomaly? ...

... Previous: AstroVirgil: A Chandra Data Analysis Tool for the General Public . ... Physics Department, Pomona College, Claremont, CA . ... The testbed can be used by students with no knowledge of programming or Unix, freeing such students and their instructor to spend more time on scientific experimentation. ... Students with astrophysics knowledge can add additional data models and analysis programs from NEMO, or write their own, and they are encouraged to master NEMO natively under Unix. ...

... Aurora from Space . ... Magnetic Storms . ... The "ring of fire" seen by satellite cameras around the polar caps (picture below) is probably created by electrons leaking from the tail's plasma sheet, whose magnetic field lines form a somewhat imperfect trap. ... One possible explanation involves the close association between auroral arcs and electric currents which flow along field lines between the ionosphere and distant space ( Birkeland currents ). ... Why no aurora at the magnetic poles? ...

... What is a pulsar? ... For young pulsars with superstrong magnetic fields ( ) and hot polar caps (with temperature of ), because of the energy loss of electrons or positrons due to resonant inverse Compton scattering in the vicinity of polar caps, pair cascades occur at distances further away from the polar cap, and in this case, we have a relatively high acceleration efficiency with ions carrying most of the particle luminosity. ... Limits on particle energies by resonant inverse Compton scattering ...

... hb ( uvd _real , v2 _real ) Function. Return diameter of star for given -distance and squared visibility. Uses calibration implemented in polynomial expressions. caldiameter ( starid _char , calid _char ) Function. Return the diameter of a star using the calibrator and the uncalibrated estimated squared visibilities. npoirates , starid , predictedrate Propagate the stellar flux through the atmosphere and NPOI, and return the predicted count rate for every NPOI channel. ...