From shunrong at haystack.mit.edu Wed Jun 9 12:11:05 2004 From: shunrong at haystack.mit.edu (Shunrong Zhang) Date: Mon Oct 23 17:53:01 2006 Subject: [OpenMadrigal-developers] PACE coordinates Message-ID: Bill, Yes, the Sondrstrom resolved comp-scan velocities are binned in PACE latitudes. PACE longtitudes are not included in the database. I've checked the velocity resolving method that Mary sent me. It seems that since comp-scan is done to the east and west of the magnetic meridan, the binned velocities that have been derived from paired LOS records might have a (PACE) magnetic longitude similar to the site's or at 300 km above the radar (the PACE magnetic longtitude changes - maybe slightly - with altitude). So why don't we assume the PACE longitude for the Sondrstrome resoluved velocities from comp-scan equals to that for a point 300 km above Sondrstrome? Now with Sondrstrome's geodetic coordinates and altitude, we can calculate the PACE longitude. Then we can convert the PACE system to other systems. As a general rule, if PACE longitude is not available for converting PACE coordinates to geodetic coordinates, we may have to assume the missing longitude equals to the site's PACE longitude. (We need to be certain the change in altitude from 0 to 300 km results in a small change in PACE longitude). Shunrong From brideout at haystack.mit.edu Wed Jun 9 14:15:15 2004 From: brideout at haystack.mit.edu (William Rideout) Date: Mon Oct 23 17:53:02 2006 Subject: [OpenMadrigal-developers] PACE coordinates In-Reply-To: References: Message-ID: <40C753B3.3030604@haystack.mit.edu> Shunrong Zhang wrote: > As a general rule, if PACE longitude is not available for converting PACE > coordinates to geodetic coordinates, we may have to assume the missing > longitude equals to the site's PACE longitude. (We need to be certain the > change in altitude from 0 to 300 km results in a small change in PACE > longitude). > Shunrong, Madrigal by design can't have site-specific logic such as defaulting to 300 km altitude for Sondrestrom. If you need some site-specific logic, we'll need to write it just for you to process the data after its been taken from Madrigal. Defaulting to the position of the instrument is fine however, and I can make Madrigal get PACE longitude for instrument location. I did calculate the PACE longitude for Sondrestrom at 300 km (41.03 degrees) and 0 km (41.63 degrees). Let me know whether this difference is too large for you. Bill -- Bill Rideout MIT Haystack Observatory Email: brideout@haystack.mit.edu Phone: 781 981-5624 From jmh at haystack.mit.edu Wed Jun 9 15:05:57 2004 From: jmh at haystack.mit.edu (John Holt) Date: Mon Oct 23 17:53:02 2006 Subject: [OpenMadrigal-developers] PACE coordinates Message-ID: <200406091905.i59J5vJ19743@chaos.haystack.mit.edu> I wopuld have thought we were only interested in line-of-sight velocities. Is this correct? Are az, el and range available? John From shunrong at haystack.mit.edu Wed Jun 9 16:23:38 2004 From: shunrong at haystack.mit.edu (Shunrong Zhang) Date: Mon Oct 23 17:53:02 2006 Subject: [OpenMadrigal-developers] PACE coordinates In-Reply-To: <40C753B3.3030604@haystack.mit.edu> Message-ID: Bill, > > Madrigal by design can't have site-specific logic such as defaulting to 300 km > altitude for Sondrestrom. If you need some site-specific logic, we'll need to > write it just for you to process the data after its been taken from Madrigal. > > Defaulting to the position of the instrument is fine however, and I can make > Madrigal get PACE longitude for instrument location. I did calculate the PACE > longitude for Sondrestrom at 300 km (41.03 degrees) and 0 km (41.63 degrees). > Let me know whether this difference is too large for you. > It seems we have to use the PACE longitude at 300km, instead of on the ground. I thank we can use 300 km as a default, whether it is for Sondrstrom of not, as I think that PACE system is largely used for upper atmosphere studies, so 300 km should be a reasonable assumption. By the way, from the original PACE coordinate paper, conversion is only appropriate between 0 - 600 km. Shunrong From brideout at haystack.mit.edu Tue Jun 15 16:40:03 2004 From: brideout at haystack.mit.edu (William Rideout) Date: Mon Oct 23 17:53:02 2006 Subject: [OpenMadrigal-developers] Madrigal 2.3 ready for release Message-ID: <40CF5EA3.204@haystack.mit.edu> John, Both the Eiscat and SRI Madrigal sites are fully functional running Madrigal 2.3, and so its ready for release. I've updated the OpenMadrigal web page so that the new release is available. The list of new features is at http://www.haystack.mit.edu/madrigal/whatsNew.html. Should we do the same two annoucements as before - technical details to Madrigal admin, and general to Madrigal announce? Bill -- Bill Rideout MIT Haystack Observatory Email: brideout@haystack.mit.edu Phone: 781 981-5624