التفاصيل البيبلوغرافية
| العنوان: |
The Error of Global Ionospheric Map‐TEC During Equatorial Plasma Bubble Event in the High Solar Activity Year. |
| المؤلفون: |
Tang, Long, Zhang, Fenkai, Chen, Wu |
| المصدر: |
Space Weather: The International Journal of Research & Applications; Jun2024, Vol. 22 Issue 6, p1-8, 8p |
| مصطلحات موضوعية: |
SOLAR activity, GLOBAL Positioning System, OCCULTATIONS (Astronomy), SPACE environment, SOLAR cycle |
| مستخلص: |
In this study, the error of total electron content (TEC) derived from the global ionospheric map (GIM) (GIM‐TEC) during equatorial plasma bubble (EPB) event is investigated for the first time. The frequently‐used assessment parameter of ionospheric TEC model, namely difference of Slant TEC (difference of slant total electron content (dSTEC)) is checked and employed based on eight global navigation satellite system (GNSS) stations distributed around the geomagnetic equator during the high solar activity year of 2014. The international GNSS service final GIM products are exemplified. The results present several interesting findings: (a) The observed dSTEC series is biased when an EPB is observed at the highest satellite elevation, leading to a fake bias in GIM‐TEC; (b) When an EPB occurred, the error of GIM‐TEC can increases or decreases and its variation sign is unrelated to the magnitude of EPB; (c) The average of the EPB‐induced GIM‐TEC errors is mainly at −5 to 5 TECU with 76% (24%) of positive (negative) values, and the maximum (minimum) is close to 10 TECU (−10 TECU); (d) The structure of EPB is unable to be captured by the GIM‐TEC series. Plain Language Summary: The global ionospheric map (GIM) derived total electron content (TEC) (GIM‐TEC) is one kind of frequently‐used data in ionospheric monitoring, GNSS positioning and other related areas. So, investigating the error of GIM‐TEC is an important work before using it. The performance of GIM products is closely related to ionospheric variations. One kind of space weather event, namely geomagnetic disturbance, is usually discussed in pervious literature. In this study, we investigate another kind of common ionospheric variation called equatorial plasma bubble (EPB). The EPB is generally occurred after sunset and can cause ionospheric TEC depletion, thereby generating huge TEC gradients. The results show the most errors of GIM‐TEC are increased during EPB event. In addition, the structure of EPB is unable to be captured by the GIM‐TEC series due to the low spatial‐temporal resolution and linear interpolation method. Key Points: The observed difference of Slant total electron content (TEC) (difference of slant total electron content (dSTEC)) series is biased when an equatorial plasma bubble (EPB) occurred at the highest satellite elevationThe error of GIM‐TEC can increases (76%) or decreases (24%) during EPB event and its variation sign is unrelated to the magnitude of EPBThe structure of EPB is unable to be captured by the GIM‐TEC due to the low spatial‐temporal resolution and linear interpolation method [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
