... The planets differ greatly in size and properties, and their fields differ too. ... In 1959, after the Earth's radiation belt had been discovered, Frank Drake observed Jupiter and concluded from the relative intensities in a range of wavelengths that the signal was probably emitted by electrons trapped in a strong magnetic field. Then in 1973 the space probe Pioneer 10 passed by Jupiter and found there, sure enough, an enormous planetary magnetic field and a very intense radiation belt. ...

... Magnetic Storms . ... Cosmic Rays . ... Energetic Particles . ... Solar fast Particles . We cannot observe the way the distant universe accelerates cosmic rays or produces energetic photons, but acceleration processes also occur on our Sun , though on a much more moderate scale. ... That is why such events are often missed by cosmic ray detectors near the equator, where the lowest energies are excluded by the Earth's magnetic field. ... Should we be concerned about solar energetic radiation? ...

... Fitting the observed dependence includes calculations of the polarization cross-sections averaged over particles orientation and size distribution, their normalization and the comparison of obtained dependencies with Serkowski's curve representing observational data for a chosen star. ... Variations of the polarization factors with wavelength are shown in Fig. 16 for homogeneous spheroidal particles with PF orientation. ... The distinction between prolate and oblate spheroids is also clearly seen. ...

... The related observations clearly evidence both global motions and turbulence in the upper Jovian atmosphere. Keywords: solar system, giant planets, atmospheres, Jupiter . To explain both an upper atmospheric thermal excess observed in the Jupiter atmosphere by the Voyager missions and a permanent enhancement of the H Ly- brightness observed near the equator (Clarke et al. ... These Doppler shifts appear as being the signature of global H motions in the upper atmosphere of Jupiter. ...

Next: Rotation Periods of ZAMS stars Previous: T Tauri Stars . ... The first attempts to directly measure periodic modulation of T Tauri stars occurred in the early 1980s. Rydgren & Vrba (1983) observed four PMS stars using photoelectric photometry over a period of seven consecutive photometric nights. ... Because the spot lifetime is much longer than the rotational period, the observed effect will be a modulation of the light from the star synchronously with the rotation period. ...

... The results of radio observations of GRB 080319B in the spectral range of 8.45 GHz are presented. ... Key words: Gamma­rays ­ bursts: observations ­ radio: individual: GRB 080319B 1 Intro duction Gamma­ray bursts (GRBs) are the most luminous explosions currently known in the Universe. ... Smooth angular scanning was used not only in GRB 080319B observations, but to specify the primary standard source radio flux density as well (Kharinov et al., ...

... A2005 Date Received: 2004­Sep­29 18:51:13 Technical Page Proposal Type: Regular General Category: Astronomy Sub­Category: Continuum Observation Category: Galactic Total Time Requested: 42 Hours Proposal Title: The Origin of Magnetic Activity in Sub­Stellar Objects ABSTRACT: The processes of magnetic field generation, amplification and dissipation in sub­stellar objects are not understood, but could provide direct information on the internal convection and the structure of the atmosphere. ...

Direct images gallery. Here we have presented some images obtained on SAO telescopes by using SCORPIO. ... NGC 6951 . ... This color image are combined from the frames in the filters V ("blue"), R ("green") and middle-band filter SED755 ("red"). ... The true color image is constructed from three frames in B (Texp=600 sec), V (Texp=480 sec) and R (Texp=400 sec) filters. ... The true color image is constructed from three frames in B (Texp=180 sec), V (Texp=120 sec) and R (Texp=90 sec) filters. ...

Magnesium : a new probe of the thermosphere / exosphere region V. Bourrier, A. Lecavelier des Etangs, A. Vidal-Madjar Institut d'Astrophysique de Paris/CNRS, Paris, France Atmospheric escape from HD209458b Transit observations in the Lyman- line of neutral Oxygen, carbon and silicium were also found in its Schlawin et al. 2010), carried away to high altitudes heavy species at high altitude: neutral ... 2003, Nature, 422, 143 Vidal-Madjar, A., DИsert, J.-M., et al. ...

This page allows the current observer to add to the session log for the current PPTA observing session. To start a new session, click 'start new observing session'. The last observer in the session must end the session by clicking on 'finish current observing session' - the observer will be redirected to a form. ... Current observer: . ... Note that all windparks, failures etc. should also be recorded through the standard observing webpages (click on "Links" tab at the top of the dashboard) . ...