A global climatology of ionospheric irregularities derived from GPS radio occultation

Arras, Christina; Wickert, Jens; Beyerle, G.; Heise, S.; Schmidt, T.; Jacobi, Ch.

doi:10.1029/2008gl034158

Cited by 192 publications

(325 citation statements)

References 22 publications

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“…Fig ure 17 shows initial re sults of these in ves ti ga tions and dem on strates that the avail abil ity of the FORMOSAT-3/COS MIC data al lows the char ac ter iza tion of the global dis tri bu tion with un prec edented res o lu tion in time and space (Ar ras et al 2008). With an oc cur rence fre quency of up to around 50% of all occultations in par tic u lar re gions, spo radic E is a sig nif i cant phe nom e non in the lower ion o sphere.…”

Section: Global In Ves Ti Ga Tions Of Ion O Spheric Ir Reg U Lar I Tiesmentioning

confidence: 99%

“…We de rived the lo ca tion of the spo radic E-lay ers us ing am pli tude vari a tions of the RO sig nal as an in di ca tor (Wickert et al 2004b, Ar ras et al 2008) . Fig ure 17 shows initial re sults of these in ves ti ga tions and dem on strates that the avail abil ity of the FORMOSAT-3/COS MIC data al lows the char ac ter iza tion of the global dis tri bu tion with un prec edented res o lu tion in time and space (Ar ras et al 2008).…”

Section: Global In Ves Ti Ga Tions Of Ion O Spheric Ir Reg U Lar I Tiesmentioning

confidence: 99%

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GPS Radio Occultation: Results from CHAMP, GRACE and FORMOSAT-3/COSMIC

Wickert¹,

Michalak²,

Schmidt³

et al. 2009

Terr. Atmos. Ocean. Sci.

106

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AB STRACTThe Tai wan/US FORMOSAT-3/COS MIC (FORMOsa SAT el lite mis sion -3/Con stel la tion Ob serv ing Sys tem for Me te o rol ogy, Ion o sphere and Cli mate) sat el lite con stel la tion was suc cess fully launched on 14 April 2006. It is ex pected to le ver age the use of the GPS (Global Po si tion ing Sys tem) ra dio occultation data for at mo spheric and ion o spheric re search to im prove global weather fore casts and aid cli mate change re lated stud ies. FORMOSAT-3/COS MIC, to gether with the Eu ro pean MetOp, Ger man CHAMP and US/Ger man GRACE-A sat el lites, form a 9 sat el lite con stel la tion for pre cise at mo spheric sound ing on a global scale. This sat el lite con stel la tion is expected to provide about 3500 occultation measurements daily.Re cent re sults and the sta tus of the CHAMP and GRACE-A or bit and occultation data anal y sis are re viewed and com ple mented with a re view of ini tial re sults from FORMOSAT-3/COS MIC at GFZ. The sig nif i cantly in creased po ten tial of the CHAMP, GRACE-A and FORMOSAT-3/COS MIC con stel la tion for at mo spheric stud ies, com pared to sin gle sat el lite mis sions, is dem on strated for se lected ap pli ca tions such as global mon i tor ing of wa ter va por dis tri bu tions, tropo pause parameters and ionospheric irregularities.

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Section: Global In Ves Ti Ga Tions Of Ion O Spheric Ir Reg U Lar I Tiesmentioning

confidence: 99%

Section: Global In Ves Ti Ga Tions Of Ion O Spheric Ir Reg U Lar I Tiesmentioning

confidence: 99%

GPS Radio Occultation: Results from CHAMP, GRACE and FORMOSAT-3/COSMIC

Wickert¹,

Michalak²,

Schmidt³

et al. 2009

Terr. Atmos. Ocean. Sci.

106

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show abstract

“…Therefore it is not possible to observe sporadic E layers at higher altitudes where its formation might be influenced by the meridional wind or the descending intermediate layers. A more detailed description and initial results of the application of this technique are given by Arras et al (2008) and Wickert et al (2009).…”

Section: Measurements and Data Analysismentioning

confidence: 99%

Semidiurnal tidal signature in sporadic E occurrence rates derived from GPS radio occultation measurements at higher midlatitudes

Jacobi²,

2009

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Abstract. GPS (Global Positioning System) Radio occultation (RO) measurements from CHAMP, GRACE and FORMOSAT-3/COSMIC satellites at Northern Hemisphere midlatitides (50 • -55 • N) are analysed to obtain the diurnal variation of sporadic E layer occurrence frequency in 2006 and 2007. Interconnections with zonal wind shears measured by meteor radar at Collm (51.3 • N, 13 • E), Germany, are investigated. According to theory, maximum E s occurrence is expected when the zonal wind shear, which is mainly produced by the semidiurnal tide in midlatitudes, is negative. This is confirmed by the present measurements and analysis.

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“…L-band scintillations and their relations with plasma irregularities at both ionospheric E-(e.g., Hocke et al, 2001;Arras et al, 2008) and F-regions (e.g., Brahmanandam et al, 2012;Dymond et al, 2012;Carter et al, 2013). Buchert et al (2015) reported that the GPS receiver onboard Swarm satellites repeatedly encountered signal interruptions during January and February 2014.…”

Section: Introductionmentioning

confidence: 99%

Climatology of GPS signal loss observed by Swarm satellites

2018

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Abstract. By using 3-year global positioning system (GPS) measurements from December 2013 to November 2016, we provide in this study a detailed survey on the climatology of the GPS signal loss of Swarm onboard receivers. Our results show that the GPS signal losses prefer to occur at both low latitudes between ±5 and ±20 • magnetic latitude (MLAT) and high latitudes above 60 • MLAT in both hemispheres. These events at all latitudes are observed mainly during equinoxes and December solstice months, while totally absent during June solstice months. At low latitudes the GPS signal losses are caused by the equatorial plasma irregularities shortly after sunset, and at high latitude they are also highly related to the large density gradients associated with ionospheric irregularities. Additionally, the highlatitude events are more often observed in the Southern Hemisphere, occurring mainly at the cusp region and along nightside auroral latitudes. The signal losses mainly happen for those GPS rays with elevation angles less than 20 • , and more commonly occur when the line of sight between GPS and Swarm satellites is aligned with the shell structure of plasma irregularities. Our results also confirm that the capability of the Swarm receiver has been improved after the bandwidth of the phase-locked loop (PLL) widened, but the updates cannot radically avoid the interruption in tracking GPS satellites caused by the ionospheric plasma irregularities. Additionally, after the PLL bandwidth increased larger than 0.5 Hz, some unexpected signal losses are observed even at middle latitudes, which are not related to the ionospheric plasma irregularities. Our results suggest that rather than 1.0 Hz, a PLL bandwidth of 0.5 Hz is a more suitable value for the Swarm receiver.

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A global climatology of ionospheric irregularities derived from GPS radio occultation

Cited by 192 publications

References 22 publications

GPS Radio Occultation: Results from CHAMP, GRACE and FORMOSAT-3/COSMIC

GPS Radio Occultation: Results from CHAMP, GRACE and FORMOSAT-3/COSMIC

Semidiurnal tidal signature in sporadic E occurrence rates derived from GPS radio occultation measurements at higher midlatitudes

Climatology of GPS signal loss observed by Swarm satellites

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