Imagery was gathered at the AMOS observatory on the 3.6-meter telescope for the expected occultation of a star by the dwarf planet, Pluto, on 29 June 2012. The imagery was taken at 5 Hz for 40 minutes before and after the expected time of occultation. The initial analysis of the photometry indicated that Pluto did not occult the star. This conclusion could not be determined from a simple visual...

Millisecond dips in the RXTE/PCA light curve of Sco X-1 were reported recently (Chang et al. 2006), which were interpreted as the occultation of X-rays from Sco X-1 caused by Trans-Neptunian Objects (TNO) of hundred-meter size. Inconclusive signatures of possible instrumental effects in many of these dip events related to highenergy cosmic rays were later found (Jones et al. 2006) and the TNO i...

An optimal estimation inverse method is presented which can be used to retrieve simultaneously vertical profiles of temperature and specific humidity, in addition to surface pressure, from satellite-to-satellite radio occultation observations of the Earth’s atmosphere. The method is a non-linear, maximum a posteriori technique which can accommodate most aspects of the real radio occultation pro...

A lunar occultation of the M1 supergiant TV Gem has been observed in the near infrared region at 2.2μm. A detailed analysis of the observed occultation light curve has been performed using two different reduction methods permitting the circumstellar dust envelope to be directly detected for the first time around TV Gem. The star has been resolved to yield a uniform disk diameter of 4.9±0.3milli...

The results of a search for sub-km Kuiper Belt Objects (KBOs) with the method of serendipitous stellar occultations are reported. Photometric time series were obtained on the 1.8m telescope at the Dominion Astrophysical Observatory (DAO) in Victoria, British Columbia, and were analyzed for the presence of occultation events. Observations were performed at 40 Hz and included a total of 5.0 star-...

Faraclay rotation observations are unique amongst radio occultation mcasurcmcnts in that they respond to magnetic field in addition to e.lcctron density, making it possible to probe the coronal magnetic field. Transients observed by Pioneer 6 Faraday rotation measurements in 1968 in the heliocentric distance range of 6-11 R. arc shown to be caused by the radially expanding coronal streamer stal...

[1] The atmospheric limb sounding technique making use of radio signals transmitted by the Global Positioning System (GPS) has already proven to be a promising approach for global atmospheric measurements. In this study, we assess for the first time the potential of GPS radio occultation soundings for detecting the migrating diurnal tide. Retrieved temperatures between 10 and 30 km in the tropi...

GPS radio occultation with CHAMP: monitoring of climate change parameters T. Schmidt, S. Heise, J. Wickert, G. Beyerle, and C. Reigber GeoForschungsZentrum Potsdam, Department 1: Geodesy and Remote Sensing, Potsdam, Germany Received: 20 September 2004 – Accepted: 27 October 2004 – Published: 1 December 2004 Correspondence to: T. Schmidt ([email protected]) © 2004 Author(s). This work is l...

The ‘statistically optimal’ approach to smoothing bending angles derived from radio occultation (RO) measurements is outlined. This combines a measured bending angle profile with an a priori or background estimate derived from climatology, in order to obtain the most probable bending angle profile. However, the method is only optimal if the error statistics of both the measured and background p...

Introduction Conclusions References