Message-Id: Date: Thu, 13 Sep 2001 10:43:41 -0700 To: igsmail@igscb.jpl.nasa.gov From: Tony Mannucci Subject: [IGSMAIL-3522]: Occultation data from the SAC-C spacecraft Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 13 Sep 10:43:44 PDT 2001 Message Number 3522 ****************************************************************************** Author: Tony Mannucci Dear IGS Colleagues, I am pleased to announce the availability of preliminary atmospheric and ionospheric occultation data acquired from JPL's Blackjack GPS receiver onboard the SAC-C spacecraft. For each occultation event, we are distributing the raw phase observables at both GPS frequencies from two GPS satellites in view of the rear-facing antenna, an occulting satellite and a high elevation satellite used for calibration purposes. The data can be downloaded via anonymous ftp. Information is provided at the end of this notice. We ask the following of those who choose to download and analyse these data: 1. Please send an email to Gerald Manipon at leoops@sdsio.jpl.nasa.gov announcing your intention to download the data. 2. Please use these results exclusively for internal evaluation and testing purposes. A future announcement is expected in about two months when the data are ready for scientific analyses. 3. Send inquiries to Gerald Manipon at leoops@sdsio.jpl.nasa.gov. We cannot promise support beyond what is available in the ftp area. These data are primarily intended for evaluation and testing by groups familiar with the technical details of occultation processing. No atmospheric retrieval parameters are currently being made available. An announcement will be made when these higher level products are available on the GENESIS Earth science information database (http://genesis.jpl.nasa.gov). The occultation capability onboard the spacecraft is still under development, and it is understood that changes to the data formats and acquisition modes will be occurring from time to time. General status notices will be posted on a best efforts basis in a text file in the ftp area (see below). High-rate ground data useful in processing these occultations are available from the International GPS Service (IGS) (See IGSLEO message number 9 at http://igscb.jpl.nasa.gov/mail/igsleo/igsleo.html). The availability of these data is the result of outstanding effort from a number of individuals within the following groups and institutions: CONAE (Argentine space agency) GENESIS group at JPL GPS Earth Observatory group at JPL GPS Systems group at JPL International GPS Service NASA Orbiter and Radiometric Systems group at JPL Raytheon Technical Services Company Satellite Geodesy and Geodynamics Systems group at JPL DATA DOWNLOAD INFORMATION ---------------------------- Use anonymous ftp to the following address: ftp://sideshow.jpl.nasa.gov/pub/genesis/level0/sac-c/ Source code for the data reader is in ftp://sideshow.jpl.nasa.gov/pub/genesis/level0/sac-c/Software/BJfmtl.c. Additional documentation is contained in: ftp://sideshow.jpl.nasa.gov/pub/genesis/level0/sac-c/Documents/ README.BJfmtl describes the reader, BJfmtl.c . README.010803 describes the data. README.receiver contains receiver status information. General information on the SAC-C satellite is available from: http://pao.gsfc.nasa.gov/gsfc/missions/projects/sac-c.htm http://orbis.conae.gov.ar/sac-c/ -- Tony Mannucci Task Manager, GPS Earth Observatory project Jet Propulsion Laboratory, California Institute of Technology MS 138-308 4800 Oak Grove Drive Pasadena, CA 91109 email: Tony.Mannucci@jpl.nasa.gov -- Tony Mannucci Supervisor, Ionospheric and Atmospheric Remote Sensing Group Mail-Stop 138-308B, Tel > (818) 354-1699 Jet Propulsion Laboratory, Fax > (818) 393-5115 California Institute of Technology, Email > Tony.Mannucci@jpl.nasa.gov 4800 Oak Grove Drive, http://genesis.jpl.nasa.gov Pasadena, CA 91109