GPS TEC Fluctuations in the Low and High Latitudes During the 2015 St. Patrick`s Day Storm
As a part of collaborative efforts to understand ionospheric irregularities, the Korea ionospheric scintillation sites (KISS) network has been built based on global positioning system (GPS) receivers with sampling rates higher than 1 Hz. We produce the rate of TEC index (ROTI) to represent GPS TEC f...
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| Format: | Article |
| Language: | English |
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The Korean Space Science Society
2017-12-01
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| Series: | Journal of Astronomy and Space Sciences |
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| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2017/v34n4/OJOOBS_2017_v34n4_245.pdf |
| _version_ | 1797331070369136640 |
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| author | Jong-Kyun Chung Junseok Hong Sung-Moon Yoo Jeong-Han Kim Geonhwa Jee Valery V. Hegai |
| author_facet | Jong-Kyun Chung Junseok Hong Sung-Moon Yoo Jeong-Han Kim Geonhwa Jee Valery V. Hegai |
| author_sort | Jong-Kyun Chung |
| collection | DOAJ |
| description | As a part of collaborative efforts to understand ionospheric irregularities, the Korea ionospheric scintillation sites (KISS) network has been built based on global positioning system (GPS) receivers with sampling rates higher than 1 Hz. We produce the rate of TEC index (ROTI) to represent GPS TEC fluctuations related to ionospheric irregularities. In the KISS network, two ground-based GPS sites at Kiruna (marker: KIRN; geographic: 67.9° N, 21.4° E; geomagnetic: 65.2° N) and Chuuk (marker: CHUK; geographic: 7.5° N, 151.9° E; geomagnetic: 0.4° N) were selected to evaluate the ROTI value for ionospheric irregularities during the occurrence of the 2015 St. Patrick’s Day storm. The KIRN ROTI values in the aurora region appear to be generally much higher than the CHUK ROTI values in the EIA region. The CHUK ROTI values increased to ~0.5 TECU/min around UT=13:00 (LT=23:00) on March 16 in the quiet geomagnetic condition. On March 17, 2015, CHUK ROTI values more than 1.0 TECU/min were measured between UT=9:00 and 12:00 (LT=19:00 and 22:00) during the first main phase of the St. Patrick’s Day storm. This may be due to ionospheric irregularities by increased pre-reversal enhancement (PRE) after sunset during the geomagnetic storm. Post-midnight, the CHUK ROTI showed two peaks of ~0.5 TECU/min and ~0.3 TECU/min near UT=15:00 (LT=01:00) and UT=18:00 (LT=04:00) at the second main phase. The KIRN site showed significant peaks of ROTI around geomagnetic latitude=63.3° N and MLT=15:40 on the same day. These can be explained by enhanced ionospheric irregularities in the auroral oval at the maximum of AE index |
| first_indexed | 2024-03-08T07:29:14Z |
| format | Article |
| id | doaj.art-6f45c10f91b448ce88f3086e9e02486a |
| institution | Directory Open Access Journal |
| issn | 2093-5587 2093-1409 |
| language | English |
| last_indexed | 2024-03-08T07:29:14Z |
| publishDate | 2017-12-01 |
| publisher | The Korean Space Science Society |
| record_format | Article |
| series | Journal of Astronomy and Space Sciences |
| spelling | doaj.art-6f45c10f91b448ce88f3086e9e02486a2024-02-02T21:05:37ZengThe Korean Space Science SocietyJournal of Astronomy and Space Sciences2093-55872093-14092017-12-0134424525010.5140/JASS.2017.34.4.245GPS TEC Fluctuations in the Low and High Latitudes During the 2015 St. Patrick`s Day StormJong-Kyun Chung0Junseok Hong1Sung-Moon Yoo2Jeong-Han Kim3Geonhwa Jee4Valery V. Hegai5Korea Astronomy & Space Science Institute, Daejeon 34055, KoreaKorea Astronomy & Space Science Institute, Daejeon 34055, KoreaKorea Astronomy & Space Science Institute, Daejeon 34055, KoreaKorea Polar Research Institute, Incheon 21990, KoreaKorea Polar Research Institute, Incheon 21990, KoreaPushkov Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Russian Academy of Sciences (IZMIRAN), Moscow, Troitsk 142190, Russia As a part of collaborative efforts to understand ionospheric irregularities, the Korea ionospheric scintillation sites (KISS) network has been built based on global positioning system (GPS) receivers with sampling rates higher than 1 Hz. We produce the rate of TEC index (ROTI) to represent GPS TEC fluctuations related to ionospheric irregularities. In the KISS network, two ground-based GPS sites at Kiruna (marker: KIRN; geographic: 67.9° N, 21.4° E; geomagnetic: 65.2° N) and Chuuk (marker: CHUK; geographic: 7.5° N, 151.9° E; geomagnetic: 0.4° N) were selected to evaluate the ROTI value for ionospheric irregularities during the occurrence of the 2015 St. Patrick’s Day storm. The KIRN ROTI values in the aurora region appear to be generally much higher than the CHUK ROTI values in the EIA region. The CHUK ROTI values increased to ~0.5 TECU/min around UT=13:00 (LT=23:00) on March 16 in the quiet geomagnetic condition. On March 17, 2015, CHUK ROTI values more than 1.0 TECU/min were measured between UT=9:00 and 12:00 (LT=19:00 and 22:00) during the first main phase of the St. Patrick’s Day storm. This may be due to ionospheric irregularities by increased pre-reversal enhancement (PRE) after sunset during the geomagnetic storm. Post-midnight, the CHUK ROTI showed two peaks of ~0.5 TECU/min and ~0.3 TECU/min near UT=15:00 (LT=01:00) and UT=18:00 (LT=04:00) at the second main phase. The KIRN site showed significant peaks of ROTI around geomagnetic latitude=63.3° N and MLT=15:40 on the same day. These can be explained by enhanced ionospheric irregularities in the auroral oval at the maximum of AE indexhttp://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2017/v34n4/OJOOBS_2017_v34n4_245.pdfGPS TEC fluctuationrate of TEC indexionospheric irregularitylow and high latitudes |
| spellingShingle | Jong-Kyun Chung Junseok Hong Sung-Moon Yoo Jeong-Han Kim Geonhwa Jee Valery V. Hegai GPS TEC Fluctuations in the Low and High Latitudes During the 2015 St. Patrick`s Day Storm Journal of Astronomy and Space Sciences GPS TEC fluctuation rate of TEC index ionospheric irregularity low and high latitudes |
| title | GPS TEC Fluctuations in the Low and High Latitudes During the 2015 St. Patrick`s Day Storm |
| title_full | GPS TEC Fluctuations in the Low and High Latitudes During the 2015 St. Patrick`s Day Storm |
| title_fullStr | GPS TEC Fluctuations in the Low and High Latitudes During the 2015 St. Patrick`s Day Storm |
| title_full_unstemmed | GPS TEC Fluctuations in the Low and High Latitudes During the 2015 St. Patrick`s Day Storm |
| title_short | GPS TEC Fluctuations in the Low and High Latitudes During the 2015 St. Patrick`s Day Storm |
| title_sort | gps tec fluctuations in the low and high latitudes during the 2015 st patrick s day storm |
| topic | GPS TEC fluctuation rate of TEC index ionospheric irregularity low and high latitudes |
| url | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2017/v34n4/OJOOBS_2017_v34n4_245.pdf |
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