Observation of wave structures in the upper atmosphere by means of radio holographic analysis of the radio occultation data

Igarashi, K.; Pavelyev, A. G.; Hocke, Klemens; Pavelyev, D.; Wickert, Jens

doi:10.1016/s0273-1177(01)00144-2

Cited by 40 publications

(65 citation statements)

References 9 publications

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“…The amplitude of the RO signal offers new possibilities for studying the ionosphere (Vorob'ev et al, 1997;Sokolovskiy, 2000;Sokolovskiy et al, 2002;Igarashi et al, 2000Igarashi et al, , 2001Gorbunov et al, 2002;Pavelyev et al, 2002Pavelyev et al, , 2004Pavelyev et al, , 2007Pavelyev et al, , 2008aPavelyev et al, , b, 2009Pavelyev et al, , 2010aLiou et al, 2002Liou et al, , 2003Liou et al, , 2005Liou et al, , 2007Liou and Pavelyev, 2006). Igarashi et al (2000Igarashi et al ( , 2001; Pavelyev et al (2002), indicated high sensitivity of the RO amplitude (as compared with the eikonal) on features of plasma layers in the E-region of the ionosphere. Comparison of the eikonal and amplitude variations in the Microlab-1 RO data and estimation of sporadic E-layers parameters made by Vorob'ev et al (1997).…”

Section: Introductionmentioning

confidence: 99%

Identification and localization of layers in the ionosphere using the eikonal and amplitude of radio occultation signals

et al. 2012

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Abstract. By using the CHAllenge Minisatellite Payload (CHAMP) radio occultation (RO) data, a description of different types of the ionospheric impacts on the RO signals at the altitudes 30-90 km of the RO ray perigee is given and compared with the results of measurements obtained earlier in the satellite-to-Earth communication link at frequency 1.5415 GHz. An analytical model is introduced for describing propagation of radio waves in a stratified medium consisting of sectors with spherically symmetric refractivity distribution. This model gives analytical expressions for the phase, bending angle, and refractive attenuation of radio waves and is applied to the analysis of radio wave propagation phenomena along an extended path including the atmosphere and two parts of the ionosphere. The model explains significant amplitude and phase variations at altitudes 30-90 km of the RO ray perigee and attributes them to inclined ionospheric layers. Based on this analytical model, an innovative technique is introduced to locate layers in the atmosphere and ionosphere. A necessary and sufficient criterion is obtained for a layer to be located at the RO ray perigee. This criterion gives both qualitative and quantitative estimation of the displacement of an ionospheric and/or atmospheric layer from the RO ray perigee. This is important, in particular, for determining the location of wind shears and directions of the internal wave propagation in the lower ionosphere, and, possibly, in the atmosphere.

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Section: Introductionmentioning

confidence: 99%

Identification and localization of layers in the ionosphere using the eikonal and amplitude of radio occultation signals

et al. 2012

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“…As shown by Pavelyev et al [2001] the amplitude information may be used for retrieving vertical gradient of temperature in the atmosphere and electron density in the mesosphere.…”

Section: Discussionmentioning

confidence: 99%

“…[4] The amplitude variations at two frequencies are shown in Figure 2 Vertical gradients of the refractivity may be recalculated to find vertical temperature gradients by the method described by Pavelyev et al [2001]. Results of restoration of the temperature profile T(h) and its gradient are shown in Figure 3.…”

Section: Vertical Gradients In the Atmosphere And Lower Ionospherementioning

confidence: 99%

“…The upper ionosphere usually produces slow trend in the phase data and does not introduce essential changes in the amplitude of RO signals. In the case of quiet ionosphere the phase trend may be subtracted from the phase excess data by using the IRI-95 F-layer model [Bilitza, 2001] for time and region of radio occultation region as shown by Igarashi et al [2001]. The variations in amplitude (top pair of curves in Figure 4) are strongly correlated.…”

Section: Vertical Gradients In the Atmosphere And Lower Ionospherementioning

confidence: 99%

“…Usually only phase data are used to retrieve vertical profiles of the refraction index, temperature in the atmosphere and electron density in the ionosphere. Igarashi et al [2001] presented first results to measure vertical gradients of electron density in the lower ionosphere using amplitudes of GPS pseudoranges signals at F1, F2. The aim of this paper is to present preliminary results of measuring the vertical gradients of the refractive index in the atmosphere and electron density in the lower ionosphere through analysis of the amplitude data of the RO signals.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous observation of the vertical gradients of refractivity in the atmosphere and electron density in the lower ionosphere by radio occultation amplitude method

Liou

Pavelyev

Huang

et al. 2002

Geophysical Research Letters

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It is shown that the refractivity and temperature vertical gradients may be retrieved using radio occultation (RO) amplitude data only. For the considered RO events the vertical gradient of refractivity found from the amplitude data shows good correspondence at two frequencies and changes in interval ±2–±5 N‐units/km (between heights 5–10 km) up to ±1–±2 N‐units/km (between heights 12–21 km). The corresponding magnitudes of temperature gradient change from negative values 4– 9°K/km at the height 8–14 km to positive 1–3 °K/km above 20.5 km. Sharp changes of temperature gradient ±6–±9 °K/km are found in the tropopause at the heights between 14–20 km. The height of the equatorial tropopause is found to be equal 16.8 km in correspondence with UCAR data. The vertical gradient of electron density in the sporadic E‐layer of the ionosphere has been retrieved from the same RO event. Two maximum values of the positive gradient of about 29·109 and 28·109 [m−3km−1] are located at heights 93.5 and 99 km. Simultaneous observations of the vertical gradients of refractivity in the atmosphere and ionosphere would be useful to investigate connections between meteorological and space weather phenomena.

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Amplitude Variations in CHAMP Radio Occultation Signal as an Indicator of the Ionospheric Activity

Pavelyev

Wickert

Reigber

et al.

Earth Observation With CHAMP

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Observation of wave structures in the upper atmosphere by means of radio holographic analysis of the radio occultation data

Cited by 40 publications

References 9 publications

Identification and localization of layers in the ionosphere using the eikonal and amplitude of radio occultation signals

Identification and localization of layers in the ionosphere using the eikonal and amplitude of radio occultation signals

Simultaneous observation of the vertical gradients of refractivity in the atmosphere and electron density in the lower ionosphere by radio occultation amplitude method

Amplitude Variations in CHAMP Radio Occultation Signal as an Indicator of the Ionospheric Activity

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