Incoherent scatter radar observation of E-region vertical electric field at Arecibo

Zhou, Qihou; Morton, Yu; Huang, Chunming; Aponte, N.; Sulzer, M. P.; González, S. A.

doi:10.1029/2010gl045549

Cited by 8 publications

(16 citation statements)

References 15 publications

(26 reference statements)

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“…On the other hand, v d highly depends on ion‐neutral collision frequency, which is not known very accurately and is further complicated by the mixture of molecular and atomic ions in the altitude range of our interest. In this study, we use the molecular ion‐neutral collision frequency as in the work of Zhou et al [2011]: where [ O ], [ N 2 ], and [ O 2 ] are neutral number densities in cm −3 . The values of those densities are adopted from the MSIS‐E‐90 atmosphere model.…”

Section: Discussionmentioning

confidence: 99%

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Incoherent scatter radar study of the terdiurnal tide in the E‐ and F‐region heights at Arecibo

Gong

Zhou

2011

Geophysical Research Letters

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We report the analysis of the terdiurnal tide in the meridional wind from 90 to 350 km at a low latitude station. Our data is based on nine days of consecutive observation made by the Arecibo incoherent scatter radar during January 14–23, 2010. The terdiurnal tide is observed to be prominent at E‐region heights in the first four days (Jan. 14–18) and at the F‐region heights in the last five days (Jan. 18–23). The terdiurnal tide is among the two strongest tidal components in both regions. The vertical wavelength of the terdiurnal tide is about 100 km, and 950 km, for the altitude range of 128 to 142 km, and 180 to 320 km, respectively. The F‐region terdiurnal tide amplitude is found to be well correlated with the background meridional wind in the lower F‐region. Our analysis does not reveal any evidence that non‐linear interaction between diurnal and semidiurnal tides is important for the F‐region terdiurnal tide.

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Section: Discussionmentioning

confidence: 99%

“…On the other hand, v d highly depends on ion-neutral collision frequency, which is not known very accurately and is further complicated by the mixture of molecular and atomic ions in the altitude range of our interest. In this study, we use the molecular ion-neutral collision frequency as in the work of Zhou et al [2011]:…”

Section: Discussionmentioning

confidence: 99%

Incoherent scatter radar study of the terdiurnal tide in the E‐ and F‐region heights at Arecibo

Gong

Zhou

2011

Geophysical Research Letters

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“…The wave‐like variation of the electric field measured by sounding rockets in the 2002 SEEK‐2 experiment greatly increased our knowledge [ Pfaff et al , ; Yamamoto et al , ]. The key role of the polarization electric field in generating midlatitude FAIs has gained widespread attention [ Yokoyama et al , , ; Zhou et al , ]. Recently, the daytime E region FAIs recorded during the solar eclipses of 1999 and 2009 over India, China, and Japan evoked a lively discussion on the background conditions and important triggers for producing E region FAIs [ Patra et al , ; Thampi et al , ; Brahmanandam et al , ; Chen et al , ].…”

Section: Introductionmentioning

confidence: 99%

“…The wave-like variation of the electric field measured by sounding rockets in the 2002 SEEK-2 experiment greatly increased our knowledge Yamamoto et al, 2005]. The key role of the polarization electric field in generating midlatitude FAIs has gained widespread attention [Yokoyama et al, 2003[Yokoyama et al, , 2004Zhou et al, 2011].…”

Section: Introductionmentioning

confidence: 99%

Strong correlation between quasiperiodic echoes and plasma drift in the E region

et al. 2015

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Simultaneous observations of quasiperiodic (QP) echoes and plasma drift in the ionospheric E region were conducted in Fuke (19.5°N, 109.1°E), Hainan province, China, to investigate the QP striation tilts under varying plasma drift conditions. The E region field‐aligned irregularities (FAIs), observed using the Hainan VHF radar, and the drift velocities of the plasma blobs in the Es layer, recorded by the Hainan Digisonde operating in drift mode, are reported. The QP echoes and drift data recorded during the entire year of 2013 were analyzed and compared. A surprising consistency between the striation tilt of the QP echoes and the drift direction of the plasma blobs was discovered. A negative echo striation of the QP FAIs was recorded when the measured drift direction of the plasma blobs was southward, whereas a positive echo striation was observed during the northward drift. Furthermore, the echo trace was continuous, whereas the QP striation changed from negative to positive, and vice versa. Thus, it can be concluded that the morphology of the QP echoes may be controlled by the background wind fields in the E region. The northward/southward‐drifting striated FAIs in the observation region of a coherent scatter radar might induce the positive/negative QP echo striation in the range‐time‐intensity plots.

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“…Midlatitude E region field-aligned irregularities (FAIs) have been intensively studied after the discovery of the quasiperiodic (QP) radar echoes by Yamamoto et al [1991]. The modulated ionospheric plasma from 90 to 150 km altitude has been observed by many kinds of diagnostic methods including reflection of HF radio waves, coherent scatter of VHF waves, incoherent scatter, scintillations of satellite beacon transmissions, optical observations, and in situ measurements [Tsunoda et al, 2000;Maruyama et al, 2006;Larsen et al, 2007;Chu et al, 2011;Zhou et al, 2011]. The observations and simulations attribute the FAIs in E region to the plasma-density gradient, the spacial inhomogeneity of the sporadic E (E s ) layer, and the polarization electric field induced by the neutral wind .…”

Section: Introductionmentioning

confidence: 99%

Daytime E region field‐aligned irregularities observed during a solar eclipse

Chen

Zhao

et al. 2014

JGR Space Physics

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The driving mechanism of the midlatitude field-aligned irregularities (FAIs) has been in dispute for many years. The experimental observations were carried out during the solar eclipse of 22 July 2009 in Wuhan, China, to study the possibility of the wave-driven irregularities. A high-frequency coherent scatter radar was used to detect the E region irregularities. An ionosonde was applied to record the trace of gravity waves in ionosphere. The E region FAIs occurred at the end of the solar eclipse with fluctuant Doppler. At the same time, the oscillations on the fE s (maximum reflecting frequency of E s ) curve and in the Doppler velocity of the echoes from the E s layer were also recorded. The data analysis and comparison show that the gravity waves and the FAIs occurred at the same time with the in-phase variations in amplitude and phase. Thus, the solar eclipse and the gravity waves may play important roles in the occurrence of the irregularities. A schematic diagram of one-period gravity wave is used to explain the possible gravity wave-driven mechanism and the Doppler fluctuation in the irregularities. The daytime FAI in midlatitude is a rare phenomenon, even in the condition of solar eclipse. There are only four cases of the E region FAIs observed during a solar eclipse, including our observations. The unique feature of our observations is the synchronized oscillations in the irregularities and in the E s layer, which will help address the outstanding question of the source of the midlatitude E region FAIs.

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Incoherent scatter radar observation of E-region vertical electric field at Arecibo

Cited by 8 publications

References 15 publications

Incoherent scatter radar study of the terdiurnal tide in the E‐ and F‐region heights at Arecibo

Incoherent scatter radar study of the terdiurnal tide in the E‐ and F‐region heights at Arecibo

Strong correlation between quasiperiodic echoes and plasma drift in the E region

Daytime E region field‐aligned irregularities observed during a solar eclipse

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