{"action":"created","issue":{"url":"https://api.github.com/repos/SuperDARN/rst/issues/160","repository_url":"https://api.github.com/repos/SuperDARN/rst","labels_url":"https://api.github.com/repos/SuperDARN/rst/issues/160/labels{/name}","comments_url":"https://api.github.com/repos/SuperDARN/rst/issues/160/comments","events_url":"https://api.github.com/repos/SuperDARN/rst/issues/160/events","html_url":"https://github.com/SuperDARN/rst/issues/160","id":326265077,"number":160,"title":"Spectral width w_l negative?","user":{"login":"ksterne","id":3009489,"avatar_url":"https://avatars2.githubusercontent.com/u/3009489?v=4","gravatar_id":"","url":"https://api.github.com/users/ksterne","html_url":"https://github.com/ksterne","followers_url":"https://api.github.com/users/ksterne/followers","following_url":"https://api.github.com/users/ksterne/following{/other_user}","gists_url":"https://api.github.com/users/ksterne/gists{/gist_id}","starred_url":"https://api.github.com/users/ksterne/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ksterne/subscriptions","organizations_url":"https://api.github.com/users/ksterne/orgs","repos_url":"https://api.github.com/users/ksterne/repos","events_url":"https://api.github.com/users/ksterne/events{/privacy}","received_events_url":"https://api.github.com/users/ksterne/received_events","type":"User","site_admin":false},"labels":[{"id":483767362,"url":"https://api.github.com/repos/SuperDARN/rst/labels/question","name":"question","color":"cc317c","default":true}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":5,"created_at":"2018-05-24T19:46:53Z","updated_at":"2018-05-25T00:11:11Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"Hey all, this is probably one of those things where it would be good to have a guide describing what each of the variables means in each of our data products.  Maybe one exists, and if so, maybe someone can point me to it.  But our students were working here and noticed that there's a significant amount of spectral width (Lorentzian fit), w_l, values in fitacf files that are negative.  Is this something that's supposed to be and if so, can someone give some meaning to why a spectral width would be negative and not positive?  Does it have something to do with signals being reversed from some expected response in the frequency domain?\r\n\r\nTo give an example, we're looking at 20180207.00*cvw* data that a printrec output from `davitpy` can be seen below:\r\n\r\n```\r\n2018-02-07  00:01:00  Christmas Valley West fitacf\r\nbmnum = 23  tfreq = 14701  sky_noise_lev = 11  search_noise_lev = 17  xcf = 1  scan = 1\r\nnpnts = 8  nrang = 100  channel = 0  cpid = 151\r\ngate range pwr_0 / pwr_l      vel gsf  vel_err  width_l  geo_lat  geo_lon  geo_azm  mag_lat  mag_lon  mag_azm\r\n  39  1935  -5.0 / 7.8        8.4   1      2.9      7.1    58.79  -111.91    21.49    66.16   -49.83    14.43\r\n  43  2115 -50.0 / 5.2       12.2   1      5.5      5.3    60.28  -110.71    22.93    67.73   -48.74    15.90\r\n  44  2160 -50.0 / 8.4        7.4   1      2.7      9.4    60.66  -110.39    23.31    68.13   -48.45    16.30\r\n  45  2205  -6.4 / 12.6      -4.5   1      1.9      3.9    61.03  -110.06    23.69    68.52   -48.13    16.70\r\n  46  2250  -8.5 / 9.9       12.4   1      4.2     16.9    61.40  -109.72    24.09    68.91   -47.81    17.11\r\n  47  2295  -2.4 / 13.0      -3.7   1      0.9      1.7    61.76  -109.37    24.49    69.30   -47.47    17.53\r\n  48  2340  -5.0 / 8.2       -5.5   1      2.5     13.2    62.13  -109.02    24.90    69.68   -47.12    17.97\r\n  50  2430 -50.0 / 5.6       -4.4   1      4.0     -0.5    62.86  -108.27    25.76    70.46   -46.36    18.89\r\n\r\n2018-02-07  00:01:02  Christmas Valley West fitacf\r\nbmnum = 22  tfreq = 14710  sky_noise_lev = 10  search_noise_lev = 18  xcf = 1  scan = 0\r\nnpnts = 8  nrang = 100  channel = 0  cpid = 151\r\ngate range pwr_0 / pwr_l      vel gsf  vel_err  width_l  geo_lat  geo_lon  geo_azm  mag_lat  mag_lon  mag_azm\r\n  40  1980  -4.4 / 4.6        6.0   1      6.0     53.3    59.49  -113.34    17.34    66.59   -51.94     9.64\r\n  44  2160  -5.8 / 7.7       -4.5   1      4.6    -18.3    61.03  -112.34    18.56    68.19   -51.20    10.76\r\n  45  2205  -1.3 / 12.6      -2.3   1      2.0      0.8    61.41  -112.07    18.88    68.58   -51.00    11.06\r\n  46  2250  -7.8 / 7.7      -12.0   1      2.8     14.7    61.79  -111.80    19.21    68.98   -50.78    11.36\r\n  47  2295  -4.4 / 18.1      -2.2   1      0.9     -0.3    62.17  -111.51    19.55    69.37   -50.55    11.67\r\n  48  2340  -7.8 / 20.0      -4.7   1      0.8      0.2    62.55  -111.22    19.90    69.77   -50.32    11.99\r\n  49  2385  -3.4 / 9.2       -6.4   1      3.0    -13.9    62.93  -110.92    20.25    70.16   -50.07    12.32\r\n  51  2475  -7.8 / 3.5        4.0   1      8.8     50.1    63.69  -110.29    20.99    70.95   -49.55    13.01\r\n\r\n```"},"comment":{"url":"https://api.github.com/repos/SuperDARN/rst/issues/comments/391903390","html_url":"https://github.com/SuperDARN/rst/issues/160#issuecomment-391903390","issue_url":"https://api.github.com/repos/SuperDARN/rst/issues/160","id":391903390,"user":{"login":"pasha-ponomarenko","id":5315016,"avatar_url":"https://avatars0.githubusercontent.com/u/5315016?v=4","gravatar_id":"","url":"https://api.github.com/users/pasha-ponomarenko","html_url":"https://github.com/pasha-ponomarenko","followers_url":"https://api.github.com/users/pasha-ponomarenko/followers","following_url":"https://api.github.com/users/pasha-ponomarenko/following{/other_user}","gists_url":"https://api.github.com/users/pasha-ponomarenko/gists{/gist_id}","starred_url":"https://api.github.com/users/pasha-ponomarenko/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pasha-ponomarenko/subscriptions","organizations_url":"https://api.github.com/users/pasha-ponomarenko/orgs","repos_url":"https://api.github.com/users/pasha-ponomarenko/repos","events_url":"https://api.github.com/users/pasha-ponomarenko/events{/privacy}","received_events_url":"https://api.github.com/users/pasha-ponomarenko/received_events","type":"User","site_admin":false},"created_at":"2018-05-25T00:11:11Z","updated_at":"2018-05-25T00:11:11Z","author_association":"CONTRIBUTOR","body":"Thanks, Evan, I was pretty sure it is somewhere there!"}}
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