From jan_bornebusch at hotmail.com Tue Sep 19 10:20:40 2006 From: jan_bornebusch at hotmail.com (Jan Philipp Bornebusch) Date: Mon Sep 25 08:11:23 2006 Subject: [OpenMadrigal-users] NEL without POPL? Message-ID: Hi! I hope you are the people to ask, if not I apologize. My problem is this: Using ISPrint Database Browser I have downloaded EISCAT-Data. I am mostly interested in electron densities, so I downloaded NEL and POPL. It seems that NEL as the corrected electron density should be derived from POPL, the uncorrected electron density. Indeed I found that POPL, TI and TR are used to do that and how it's done.(http://www.eiscat.com/madrigal/cedarFormat.pdf) So far, so good. But how is it possible that there are values for NEL when there are none for POPL? I'll give a specific example: I chose the EISCAT Svalbard IS Radar Longyearbyen on November 1st 2003. The tau0 experiment is run. Start Time: 11/01/2003 00:00:15, End Time: 11/01/2003 23:59:11 For this period of time I choose to download: UTH, GDALT, NEL, POPL Because I'm interested in low altitudes, I apply the filter Max Altitude < 150 km (at the top). What I get is NEL starting from around 90 km altitude and POPL starting from about 120 km altitude. How is that possible? What does it mean? I will cut and paste a small excerpt from the output to this e-mail, so yo know what I mean. Thanks for any kind of help you can provide, Jan EISCAT Svalbard IS Radar Longyearbyen: 11/01/2003 0002:23-0003:27 UTH GDALT NEL POPL 0.049 77.86 missing missing 0.049 80.83 missing missing 0.049 85.17 missing missing 0.049 89.73 missing missing 0.049 92.69 9.979 missing 0.049 97.54 10.020 missing 0.049 101.59 10.879 missing 0.049 104.56 10.095 missing 0.049 108.95 10.495 missing 0.049 113.46 missing missing 0.049 117.68 10.776 missing 0.049 125.70 10.849 missing 0.049 132.82 10.934 missing 0.049 140.86 10.860 missing EISCAT Svalbard IS Radar Longyearbyen: 11/01/2003 0002:23-0003:27 UTH GDALT NEL POPL 0.049 118.32 missing 10.4660 0.049 121.29 missing 10.5060 0.049 124.26 missing 10.5000 0.049 127.22 missing 10.5160 0.049 130.19 missing 10.5520 0.049 133.16 missing 10.5620 0.049 136.12 missing 10.5960 0.049 139.09 missing 10.6130 0.049 142.05 missing 10.6470 0.049 145.02 missing 10.6690 0.049 147.99 missing 10.6830