Ionospheric imaging in Africa

被引：12

作者：

Chartier, Alex T. ^{[1
,2
]}

Kinrade, Joe ^{[1
]}

Mitchell, Cathryn N. ^{[1
]}

Rose, Julian A. R. ^{[1
]}

Jackson, David R. ^{[1
,2
]}

Cilliers, Pierre ^{[3
]}

Habarulema, John-Bosco ^{[3
]}

Katamzi, Zama ^{[3
]}

Mckinnell, Lee-Anne ^{[3
]}

Matamba, Tshimangadzo ^{[3
]}

Opperman, Ben ^{[3
]}

Ssessanga, Nicholas ^{[3
]}

Giday, Nigussie Mezgebe ^{[3
]}

Tyalimpi, Vumile ^{[3
]}

De Franceschi, Giorgiana ^{[4
]}

Romano, Vincenzo ^{[4
]}

Scotto, Carlo ^{[4
]}

Notarpietro, Riccardo ^{[5
]}

Dovis, Fabio ^{[5
]}

Avenant, Eugene ^{[6
]}

Wonnacott, Richard ^{[7
]}

Oyeyemi, Elijah ^{[8
]}

Mahrous, Ayman ^{[9
]}

Tsidu, Gizaw Mengistu ^{[10
]}

Lekamisy, Harvey ^{[11
]}

Olwendo, Joseph Ouko ^{[12
]}

Sibanda, Patrick ^{[13
]}

Gogie, Tsegaye Kassa ^{[14
]}

Rabiu, Babatunde ^{[15
]}

De Jong, Kees ^{[16
]}

Adewale, Adekola ^{[17
]}

机构：

[1] Univ Bath, Dept Elect Engn, Bath BA2 7AY, Avon, England

[2] Met Off, Exeter, Devon, England

[3] SANSA Space Sci, Hermanus, South Africa

[4] Ist Nazl Geofis & Vulcanol, Rome, Italy

[5] Politecn Torino, Dipartimento Elettron, Turin, Italy

[6] SANSA Space Operat, Hartebeesthoek, South Africa

[7] Dept Rural Dev & Land Reform, Cape Town, South Africa

[8] Rhodes Univ, Dept Phys & Elect, ZA-6140 Grahamstown, South Africa

[9] Helwan Univ, Space Weather Monitoring Ctr, Cairo, Egypt

[10] Univ Addis Ababa, Addis Ababa, Ethiopia

[11] Madagascar Civil Aviat Author, Antananarivo, Madagascar

[12] Pwani Univ, Sch Pure & Appl Sci, Mombasa, Kenya

[13] Univ Zambia, Dept Phys, Lusaka, Zambia

[14] Bahir Dar Univ, Bahir Dar, Ethiopia

[15] Nigerian Natl Space Res & Dev Agcy, Ctr Atmospher Res, Abuja, Nigeria

[16] Fugro Intersite BV, Leidschendam, Netherlands

[17] Univ Lagos, Dept Phys, Akoka, Nigeria

来源：

RADIO SCIENCE | 2014年 / 49卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

ionosphere; GPS; IRI; imaging; tomography; Africa; GPS; ASSIMILATION; TOMOGRAPHY; ALGORITHM;

D O I：

10.1002/2013RS005238

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Accurate ionospheric specification is necessary for improving human activities such as radar detection, navigation, and Earth observation. This is of particular importance in Africa, where strong plasma density gradients exist due to the equatorial ionization anomaly. In this paper the accuracy of three-dimensional ionospheric images is assessed over a 2 week test period (2-16 December 2012). These images are produced using differential Global Positioning System (GPS) slant total electron content observations and a time-dependent tomography algorithm. The test period is selected to coincide with a period of increased GPS data availability from the African Geodetic Reference Frame (AFREF) project. A simulation approach that includes the addition of realistic errors is employed in order to provide a ground truth. Results show that the inclusion of observations from the AFREF archive significantly reduces ionospheric specification errors across the African sector, especially in regions that are poorly served by the permanent network of GPS receivers. The permanent network could be improved by adding extra sites and by reducing the number of service outages that affect the existing sites. Key Points <list list-type="bulleted"> Ionospheric image quality in Africa is assessed Simulated and real data are both used An extended receiver network greatly improves accuracy

引用

页码：19 / 27

页数：9

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