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Project Loon based augmentation for global ionospheric modeling over Southern Hemisphere

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ABSTRACT

Global ionospheric products of vertical total electron content (VTEC) derived from GNSS measurements may have low accuracy over oceans and southern latitudes where there are not rich observations. Project Loon provides a great opportunity to enhance the measurements over those areas. In this contribution, a simulation of Project Loon based augmentation for global ionospheric modeling is performed by using the international reference ionosphere (IRI) which could simulate VTEC measurements for the balloons. The performance of the enhanced method based on simulation of Project Loon is investigated by comparing with VTEC maps from Ionosphere Associate Analysis Centers (IAACs) as well as IGS final GIMs. The comparison indicates that there is a better consistency between the VTEC maps by the enhanced method and IGS final GIMs. Also, obvious improvements of RMS maps in GIMs for the middle latitudes and southern latitudes are enabled by the augmentation of Project Loon. Additionally, JASON data are used to validate the specific improvement of the VTEC maps. The results show that the performance of VTEC maps is improved slightly, especially in southern latitudes. It is possible that the VTEC maps could be improved significantly by using real GPS measurements from balloons of Project Loon in the near future.

No MeSH data available.


Bias of the differences between WHU products and J2TEC for DOY 152–181 in 2015.
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f10: Bias of the differences between WHU products and J2TEC for DOY 152–181 in 2015.

Mentions: As an external independent VTEC measurements, JASON data is very useful for evaluation of the accuracy or specific improvement of the VTEC maps based on Project Loon augmentation over oceans and southern latitudes. Unless otherwise indicated, VTEC measurements from JASON 2 thereafter is referred to as J2TEC. Figure 10 and 11 show bias and RMS values of the differences in latitudes between WHU products (WHU_ORG and WHU_IRI) and J2TEC for the 30 day period from DOY 152–181, 2015, respectively.


Project Loon based augmentation for global ionospheric modeling over Southern Hemisphere
Bias of the differences between WHU products and J2TEC for DOY 152–181 in 2015.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5382668&req=5

f10: Bias of the differences between WHU products and J2TEC for DOY 152–181 in 2015.
Mentions: As an external independent VTEC measurements, JASON data is very useful for evaluation of the accuracy or specific improvement of the VTEC maps based on Project Loon augmentation over oceans and southern latitudes. Unless otherwise indicated, VTEC measurements from JASON 2 thereafter is referred to as J2TEC. Figure 10 and 11 show bias and RMS values of the differences in latitudes between WHU products (WHU_ORG and WHU_IRI) and J2TEC for the 30 day period from DOY 152–181, 2015, respectively.

View Article: PubMed Central - PubMed

ABSTRACT

Global ionospheric products of vertical total electron content (VTEC) derived from GNSS measurements may have low accuracy over oceans and southern latitudes where there are not rich observations. Project Loon provides a great opportunity to enhance the measurements over those areas. In this contribution, a simulation of Project Loon based augmentation for global ionospheric modeling is performed by using the international reference ionosphere (IRI) which could simulate VTEC measurements for the balloons. The performance of the enhanced method based on simulation of Project Loon is investigated by comparing with VTEC maps from Ionosphere Associate Analysis Centers (IAACs) as well as IGS final GIMs. The comparison indicates that there is a better consistency between the VTEC maps by the enhanced method and IGS final GIMs. Also, obvious improvements of RMS maps in GIMs for the middle latitudes and southern latitudes are enabled by the augmentation of Project Loon. Additionally, JASON data are used to validate the specific improvement of the VTEC maps. The results show that the performance of VTEC maps is improved slightly, especially in southern latitudes. It is possible that the VTEC maps could be improved significantly by using real GPS measurements from balloons of Project Loon in the near future.

No MeSH data available.