Solar Eclipses during the OMI Mission


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Introduction

Effect of a Solar eclipse on OMI data

OMI measures backscattered sunlight from the Earth's atmosphere in order to derive level 2 products. During solar eclipses the amount of incoming sunlight will be attenuated by the Moon's surface obscuring the Sun's disk, artificially changing the calculated amount of backscattering. Because the amount of incident solar radiation is not measured continuously, these events will introduce errors in the derived products.

Solar eclipse flagging

The data-processor has the capability to raise warning flags in case of solar eclipse events. These warning flags are are set by the GDPS, based on solar eclipse prediction data in the OPF. The number of parameters for the eclipse-flagging in the OPF is limited. For each event, a start-date, end-date, start-time and end-time can be supplied. In addition, space is reserved for the four coordinates of a rectangular box which describes the geo-location coverage of the penumbral shadow during the total event. Even though the penumbral shadow does not totally cover this box continuously over the duration of the eclipse, all data will be given the Solar Eclipse warning flag bit in the Ground Pixel Quality flags. The OPF start-time of a solar eclipse was chosen to be the time where the penumbral shadow has first contacts the Earth. This time is also known as the P1-time. The OPF end-time of the event was chosen to be the last moment of contact between the penumbral shadow and the Earth. This point is also referred to as the P4-time, all these times are given as UTC-times.
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OPF Parameters

Start Date Start Time End Date End Time West East South North
[UTC] [UTC] [UTC] [UTC] [degrees] [degrees] [degrees] [degrees]
2004_04_19T 11:29:56.80000Z 2004_04_19T 15:38:36.00000Z -180.000 180.000 -89.0000 -7.0000
2004-10-14T 00:54:34.40000Z 2004-10-14T 05:04:17.80000Z -180.000 180.000 1.0000 89.0000
2005-04-08T 17:51:16.90000Z 2005-04-08T 23:20:25.80000Z -180.000 180.000 -89.0000 40.0000
2005-10-03T 07:35:31.70000Z 2005-10-03T 13:27:50.60000Z -180.000 180.000 -42.0000 89.0000
2006-03-29T 07:36:49.10000Z 2006-03-29T 12:45:41.40000Z -180.000 180.000 -38.0000 89.0000
2006-09-22T 08:39:53.40000Z 2006-09-22T 14:40:09.70000Z -180.000 180.000 -89.0000 38.0000
2007-03-19T 00:38:20.50000Z 2007-03-19T 04:24:56.60000Z -180.000 180.000 4.0000 89.0000
2007-09-11T 10:25:41.70000Z 2007-09-11T 14:36:26.70000Z -180.000 180.000 -89.0000 -6.0000
2008-02-07T 01:38:25.20000Z 2008-02-07T 06:11:48.20000Z -180.000 180.000 -89.0000 4.0000
2008-08-01T 08:04:00.40000Z 2008-08-01T 12:38:22.70000Z -180.000 180.000 -10.0000 89.0000
2009-01-26T 04:56:31.90000Z 2009-01-26T 11:00:35.00000Z -180.000 180.000 -86.0000 44.0000
2009-07-21T 23:58:12.60000Z 2009-07-22T 05:12:19.20000Z -180.000 180.000 -54.0000 63.0000
2010-01-15T 04:05:20.10000Z 2010-01-15T 10:07:27.50000Z -180.000 180.000 -36.0000 89.0000
2010-07-11T 17:09:34.90000Z 2010-07-11T 21:57:09.20000Z -180.000 180.000 -89.0000 17.0000
2011-01-04T 06:40:04.10000Z 2011-01-04T 11:00:47.40000Z -180.000 180.000 5.00000 89.0000
2011-06-01T 19:25:09.40000Z 2011-06-01T 23:06:52.60000Z -180.000 180.000 19.0000 89.0000
2011-07-01T 07:53:45.60000Z 2011-07-01T 09:22:34.60000Z -19.000 71.000 -84.0000 -47.0000
2011-11-25T 04:23:08.90000Z 2011-11-25T 08:17:08.70000Z -180.000 180.000 -89.0000 -10.000
2012-05-20T 20:56:00.20000Z 2012-05-21T 02:49:15.70000Z -180.000 180.000 -26.0000 89.0000
2012-11-13T 19:37:51.80000Z 2012-11-14T 00:45:27.80000Z -180.000 180.000 -86.0000 30.0000
2013-05-10T 21:25:10.00000Z 2013-05-11T 03:25:22.60000Z -180.000 179.000 -77.0000 37.0000
2013-11-03T 10:04:33.70000Z 2013-11-03T 15:28:21.00000Z -180.000 179.000 -32.0000 80.0000
2014-04-29T 03:52:38.10000Z 2014-04-29T 08:14:27.70000Z -180.000 179.000 -89.0000 -8.00000
2014-10-23T 19:37:30.40000Z 2014-10-23T 23:51:35.70000Z -180.000 179.000 14.0000 89.0000
2015-03-20T 07:40:50.60000Z 2015-03-20T 11:50:10.60000Z -180.000 179.000 7.00000 89.0000
2015-09-13T 04:41:35.30000Z 2015-09-13T 09:06:20.20000Z -180.000 179.000 -89.0000 -15.0000
2016-03-09T 23:19:18.90000Z 2016-03-10T 04:34:53.90000Z -180.000 179.000 -34.0000 71.0000
2016-09-01T 06:13:05.40000Z 2016-09-01T 12:00:37.40000Z -180.000 179.000 -81.0000 31.0000
2017-02-26T 12:10:44.80000Z 2017-02-26T 17:35:58.40000Z -180.000 179.000 -89.0000 23.0000
2017-08-21T 15:46:48.30000Z 2017-08-21T 21:04:19.70000Z -180.000 179.000 -25.0000 89.0000
2018-02-15T 18:55:45.80000Z 2018-02-15T 22:47:03.40000Z -180.000 179.000 -89.0000 -22.0000
2018-07-13T 01:48:17.50000Z 2018-07-13T 04:13:43.10000Z -180.000 179.000 -89.0000 -34.0000
2018-08-11T 08:02:04.80000Z 2018-08-11T 11:30:38.70000Z -180.000 179.000 19.0000 89.0000
2019-01-06T 23:34:01.80000Z 2019-01-07T 03:48:44.10000Z -180.000 179.000 13.0000 89.0000
2019-07-02T 16:55:08.10000Z 2019-07-02T 21:50:33.80000Z -180.000 179.000 -89.0000 16.0000
2019-12-26T 02:29:43.50000Z 2019-12-26T 08:05:36.10000Z -180.000 179.000 -31.0000 89.0000
2020-06-21T 03:45:53.80000Z 2020-06-21T 09:33:57.50000Z -180.000 179.000 -50.0000 66.0000
2020-12-14T 13:33:47.70000Z 2020-12-14T 18:52:59.80000Z -180.000 179.000 -81.0000 39.0000

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Solar eclipse plots

For each event up to the year 2020 the path of the penumbral shadow over the Earth has been calculated. From this path, the attenuation of the incident sun light for each geolocation can be calculated. The figures below show the maximum fractional attenuation of the sun light for each point on Earth during the event.

Solar eclipse of 2004-04-19

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Solar eclipse of 2004-10-14

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Solar eclipse of 2005-04-08

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Solar eclipse of 2005-10-03

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Solar eclipse of 2006-03-29

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Solar eclipse of 2006-09-22

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Solar eclipse of 2007-03-19

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Solar eclipse of 2007-09-11

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Solar eclipse of 2008-02-07

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Solar eclipse of 2008-08-01

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Solar eclipse of 2009-01-26

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Solar eclipse of 2009-07-22

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Solar eclipse of 2010-01-15

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Solar eclipse of 2010-07-11

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Solar eclipse of 2011-01-04

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Solar eclipse of 2011-06-01

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Solar eclipse of 2011-07-01

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Solar eclipse of 2011-11-25

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Solar eclipse of 2012-05-20

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Solar eclipse of 2012-11-13

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Solar eclipse of 2013-05-10

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Solar eclipse of 2013-11-03

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Solar eclipse of 2014-04-29

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Solar eclipse of 2014-10-23

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Solar eclipse of 2015-03-20

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Solar eclipse of 2016-03-09

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Solar eclipse of 2016-09-01

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Solar eclipse of 2017-02-26

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Solar eclipse of 2017-08-21

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Solar eclipse of 2018-02-15

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Solar eclipse of 2018-07-13

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Solar eclipse of 2018-08-11

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Solar eclipse of 2019-01-06

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Solar eclipse of 2019-07-02

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Solar eclipse of 2019-12-26

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Solar eclipse of 2020-06-21

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Solar eclipse of 2020-12-14

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