Measurement of the Characteristics of TIDs Using Small and Regional Networks of GPS Receivers during the Campaign of 17–30 July of 2008

This scientific report presents the results of a dedicated experiment that was conducted within the framework of the Low-latitude ionospheric Sensor Network (LISN) observatory to measure the characteristics of medium-scale (hundreds of km) Traveling Ionospheric Disturbances (TIDs) as they transit through the low-latitude ionosphere. A small array of 3 GPS receivers separated by 4-5 km placed in a triangular configuration was installed near Huancayo in Peru possessing several characteristics of a radio-interferometer. During the campaign days, 17–30 July 2008, TIDs were observed daily. On July 20, 2008 between 22 and 24 UT several TIDs moved across the small array of GPS receivers with a velocity near 130 m/s, were directed northward and had wavelengths close to 450 km. Other GPS receivers that were operating hundreds of km away from Huancayo show also similar TEC traces and provide a phase velocity equal to 150 m/s. This value was measured using the GPS at Piura, Cuzco and Huancayo. Based on this positive result, we conclude that small and/or regional arrays of GPS receivers can be used at low latitudes to study the role that gravity waves may have on seeding plasma bubbles.

[1]  Thomas Dautermann,et al.  Overview and summary of the Spread F Experiment (SpreadFEx) , 2009 .

[2]  T. M. Georges,et al.  Wave‐induced fluctuations in ionospheric electron content: A model indicating some observational biases , 1970 .

[3]  S. Fukao,et al.  Turbulent upwelling of the mid‐latitude ionosphere: 2. Theoretical framework , 1991 .

[4]  C. Mercier.  Observations of atmospheric gravity waves by radiointerferometry , 1986 .

[5]  E. Sardón,et al.  Estimation of total electron content using GPS data: How stable are the differential satellite and receiver instrumental biases? , 1997 .

[6]  E. L. Afraimovich,et al.  Traveling wave packets of total electron content disturbances as deduced from global GPS network data , 2002 .

[7]  F. Kamalabadi,et al.  Gravity wave and tidal influences on equatorial spread F based on observations during the Spread F Experiment (SpreadFEx) , 2008 .

[8]  M. Larsen,et al.  Gravity wave initiation of equatorial spread F: A case study , 1981 .

[9]  William H. Hooke,et al.  Ionospheric irregularities produced by internal atmospheric gravity waves , 1968 .

[10]  T. Tsuda,et al.  Middle and upper atmosphere radar observations of the dispersion relation for ionospheric gravity waves , 1995 .

[11]  R. Heelis,et al.  Seasonal and longitudinal variation of large-scale topside equatorial plasma depletions , 2005 .

[12]  Guanghui Wu,et al.  Observations of traveling ionospheric disturbances with a satellite-beacon radio interferometer : seasonal and local time behavior , 1995 .

[13]  J. L. Scali,et al.  Electrodynamics of midlatitude spread F: 1. Observations of unstable, gravity wave‐induced ionospheric electric fields at tropical latitudes , 1997 .

[14]  L. A. Leonovich,et al.  Determining parameters of large-scale traveling ionospheric disturbances of auroral origin using GPS-arrays , 2000 .

[15]  J. Bougeret.  Some effects produced by the ionosphere on radio interferometry - Fluctuations in apparent source position and image distortion , 1981 .

[16]  S. Basu,et al.  Simultaneous observation of traveling ionospheric disturbances in the Northern and Southern Hemispheres , 2009 .

[17]  Ronald F. Woodman,et al.  Radar observations of F region equatorial irregularities , 1976 .

[18]  Anthony J. Scannapieco,et al.  Nonlinear equatorial spread F , 1976 .

[19]  Michael C. Kelley,et al.  The earth's ionosphere , 1989 .

[20]  P. Fagundes,et al.  Long‐term study of medium‐scale traveling ionospheric disturbances using O I 630 nm all‐sky imaging and ionosonde over Brazilian low latitudes , 2011 .

[21]  Takuji Nakamura,et al.  Statistical study of short-period gravity waves in OH and OI nightglow images at two separated sites , 2003 .

[22]  Tadahiko Ogawa,et al.  Statistical study of nighttime medium‐scale traveling ionospheric disturbances using midlatitude airglow images , 2003 .

[23]  Paul M. Kintner,et al.  Total electron content variations due to nonclassical traveling ionospheric disturbances: Theory and Global Positioning System observations , 1997 .

[24]  K. Shiokawa,et al.  Statistical characteristics of gravity waves observed by an all-sky imager at Darwin, Australia : Darwin Area Wave Experiment (DAWEX) , 2004 .

[25]  S. Vadas.  Horizontal and vertical propagation and dissipation of gravity waves in the thermosphere from lower atmospheric and thermospheric sources , 2007 .

[26]  R. Tsunoda.  Seeding of equatorial plasma bubbles with electric fields from an Es-layer instability , 2007 .

[27]  J. Hargreaves.  The Solar-Terrestrial Environment: An Introduction to Geospace - the Science of the Terrestrial Upper Atmosphere, Ionosphere, and Magnetosphere , 1992 .

[28]  P. J. Sultan,et al.  Linear theory and modeling of the Rayleigh‐Taylor instability leading to the occurrence of equatorial spread F , 1996 .

[29]  Abram R. Jacobson,et al.  Drift‐parallax determination of the altitude of traveling ionospheric disturbances observed with the Los Alamos radio‐beacon interferometer , 1998 .

[30]  M. Yamamoto,et al.  Turbulent upwelling of the mid‐latitude ionosphere: 1. Observational results by the MU radar , 1991 .

[31]  K. Hocke,et al.  A review of atmospheric gravity waves and travelling ionospheric disturbances: 1982-1995 , 1996 .

[32]  Bodo W. Reinisch,et al.  Spread F and the structure of equatorial ionization depletions in the southern anomaly region , 1996 .

[33]  D. Fritts,et al.  The impact of gravity waves rising from convection in the lower atmosphere on the generation and nonlinear evolution of equatorial bubble , 2009 .

[34]  C. Mercier,et al.  Observations of atmospheric gravity waves by radio interferometry: are results biased by the observational technique? , 1997 .

[35]  A. Jacobson,et al.  A method for characterizing transient ionospheric disturbances using a large radiotelescope array , 1992 .

[36]  Edward L. Afraimovich,et al.  GPS radio interferometry of travelling ionospheric disturbances , 1998 .

[37]  David L. Hysell,et al.  Equatorial spread-F initiation: Post-sunset vortex, thermospheric winds, gravity waves , 2007 .

[38]  P. Fagundes,et al.  Thermospheric dark band structures observed in all‐sky OI 630 nm emission images over the Brazilian low‐latitude sector , 2008 .

[39]  M. J. Davis,et al.  The integrated ionospheric response to internal atmospheric gravity waves , 1973 .