The investigation of the ionospheric variability by the radiotranslucence method

Andrianov, V. A.; Alpatov, V. V.; Pimenov, A.N.; Romanovsky, Y.M.; Смирнов, В. М.; Shemelov, V.A.

doi:10.1016/s0273-1177(01)00166-1

Cited by 5 publications

(2 citation statements)

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“…The measurements also show depletion occurrence in electron density and temperature that was initially seen in lower altitudes of ionosphere ( E and F 1 layers) particularly below 300 km for about 1 h period (∼0900–1000 UT) followed by another period of depletion in the F 2 region between 300 and 400 km. In the F 2 region, the decrease in the F 2 layer maximum was seen between solar eclipse maximum time until after 1400 UT which persisted for more than 4 h. The reduction in the F 2 layer maximum was also observed by Andrianov et al [2001] during the 11 August 1999 solar eclipse using radar technique. Brenes et al [1993] show that the fast response of the E layer to solar eclipse comparing with F layer is a direct consequence of the short times of the recombination of electrons at altitudes of about 100 km.…”

Section: Resultsmentioning

confidence: 72%

Ionospheric and geomagnetic response to the total solar eclipse on 1 August 2008 over Northern Hemisphere

2010

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[1] The ionospheric and geomagnetic response to the total eclipse of the Sun on 1 August 2008 over Northern Hemisphere has been examined using 14 GPS, three ISR radar, and three magnetometer ground-based stations. Three different approaches were employed to examine the TEC depletion occurrence at the GPS stations: determination of the TEC depletion parameters during the solar eclipse with respect the quiet day TEC variations, comparison of the total TEC (STEC) during the solar eclipse period with respect to quiet day TEC measurements for the same period of time, and determination of the average daily TEC obtained from eight GPS stations and compares the values with the average quiet day TEC at these stations. The GPS observations indicate obvious TEC depression occurrence at all stations with the values was varying between 11% and 40%. The observations show that TEC depression at most GPS stations started on the neck of the first contact of the eclipse followed by deeper negative deviation while the area of optical disk obscured getting larger. Periods of TEC depletion were also observed before the first contact time of solar eclipse and after the fourth contact of solar eclipse due to earlier and later obscuration of the solar corona before and after the eclipse observation time. The incoherent scatter radar observations at Svalbard, Tromso, and Sondrestrom also show clear depletion occurrence in electron density, electron temperature, ion velocity, and plasma cutoff frequency during the solar eclipse passage at these stations. Radar measurements show obvious difference in the ionospheric response between the E and F layers of ionosphere and between ion and electron temperature in the F layer. The geomagnetic field response to the solar eclipse at CBB, RESO, and NUR stations was examined by using two different techniques, first by comparing the daily variations of geomagnetic field during the eclipse period with the variations on the day before and day after the eclipse, and second by determination the D magnetic field with respect to the average quiet geomagnetic field. The results show obvious decrease in the total field, X and Z components of geomagnetic field and obvious increase in the Y component at both CBB and RESO stations. The depletion in X, Z, and total field was in the range between 15 and 28 nT while the increase in the Y component was 18-22 nT.

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Section: Resultsmentioning

confidence: 72%

Ionospheric and geomagnetic response to the total solar eclipse on 1 August 2008 over Northern Hemisphere

2010

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“…The results illustrated here allow near real-time CIT using data from only one satellite and one receiver, by means of the conjugate gradient projection (CGP) algorithm [3,4] . The CGP algorithm is based on an iterative…”

Section: Introductionmentioning

confidence: 99%

Monitoring Earth's ionosphere by means of hardware-software complex using the GPS/GLONASS satellite systems

Смирнов

Смирнова

2019

Resour Environ Inf Eng

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Near real-time one-dimensional vertical electron density profiles are determined from GPSderived total electron content (TEC) data by means of the iterative conjugate gradient projection method (CGP). Electron density profiles are determined in near realtime (within minutes of the time of measurement) from short time series of slant TEC (STEC) approximately 5 minutes. Measured STEC values are obtained from dual frequency data from a single GPS satellite at a single dual frequency receiver station. Both code-based TEC derived from the P-observable (Ptec) and phase-based TEC derived from the carrier phase observable (Ltec) are used in the solution. The CGP method addresses the ill-posed inverse problem of determining the electron density profiles from TEC measurements through the application of a side constraint to the acceptable solution. This is an iterative method which approximates the solution of a least squares problem through a converging sequence of solutions. The accuracy of the results is verified by comparison to electron density determined from the ionograms measured with Digisondes (Pushkov Institute of Terrestrial Magnetizm, Ionosphere and Radio Wave Propagation, Russian Academy of Science) located at Troizk, Moscow region (55.5N, 37.3E). The results of a hardware-software complex intended for monitoring the Earth's ionosphere according to navigation satellite systems are presented. The anomalous behavior of the critical frequency of the F2-layer ionosphere at latitudes 57-59 degrees observed in December 2014 is detected.

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The ionospheric response to the 1<sup>st</sup> August 2008 total solar eclipse using incoherent scatter radar measurements

Momani

2009

2009 International Conference on Space Science and Communication

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The investigation of the ionospheric variability by the radiotranslucence method

Cited by 5 publications

References 0 publications

Ionospheric and geomagnetic response to the total solar eclipse on 1 August 2008 over Northern Hemisphere

Ionospheric and geomagnetic response to the total solar eclipse on 1 August 2008 over Northern Hemisphere

Monitoring Earth's ionosphere by means of hardware-software complex using the GPS/GLONASS satellite systems

The ionospheric response to the 1<sup>st</sup> August 2008 total solar eclipse using incoherent scatter radar measurements

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