Articles | Volume 36, issue 3
https://doi.org/10.5194/angeo-36-809-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-36-809-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Regular paper
| 
31 May 2018
Regular paper |
| 31 May 2018
| 31 May 2018
An investigation of the ionospheric F region near the EIA crest in India using OI 777.4 and 630.0 nm nightglow observations
Equatorial Geophysical Research Laboratory, Indian Institute of Geomagnetism, Tirunelveli 627 011, India
Sandro Maria Radicella
The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
Bruno Nava
The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
Yenca Olivia Migoya-Orue
The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
Prabhakar Tiwari
Dr. K. S. Krishnan Geomagnetic Research Laboratory, Indian Institute of Geomagnetism, Allahabad 221 505, India
Rajesh Singh
Dr. K. S. Krishnan Geomagnetic Research Laboratory, Indian Institute of Geomagnetism, Allahabad 221 505, India
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Gravity waves are well known to deform the bottomside plasma of the F-region into the wavelike ionization structures which then act as a seed to Rayleigh-Taylor instability, which, in turn, generates irregularities. Present study features midnight fossil airglow depletions that revived due to undergoing GW activity and turned into an active depletion.
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This study investigates the long-distance propagation (~ 1200–2000km) of gravity waves in the Indian subcontinent using coordinated nightglow measurements at Allahabad and Gadanki (separated by ~ 12º latitude). On few occasions, an identical wave (period in range ~ 2.2–4.5h) was seen at both sites that shared a common source. Waves had large horizontal wavelength (~ 1194–2746km) and phase speed (77–331m/s). The m2 profile analysis suggests the ducted propagation of the common waves.
N. Parihar, A. Taori, S. Gurubaran, and G. K. Mukherjee
Ann. Geophys., 31, 197–208, https://doi.org/10.5194/angeo-31-197-2013, https://doi.org/10.5194/angeo-31-197-2013, 2013
Navin Parihar, Saranya Padincharapad, and Anand Kumar Singh
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Revised manuscript accepted for ANGEO
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Gravity waves are well known to deform the bottomside plasma of the F-region into the wavelike ionization structures which then act as a seed to Rayleigh-Taylor instability, which, in turn, generates irregularities. Present study features midnight fossil airglow depletions that revived due to undergoing GW activity and turned into an active depletion.
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Ann. Geophys., 38, 1203–1215, https://doi.org/10.5194/angeo-38-1203-2020, https://doi.org/10.5194/angeo-38-1203-2020, 2020
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Yang Liu and Sandro Radicella
Ann. Geophys. Discuss., https://doi.org/10.5194/angeo-2019-147, https://doi.org/10.5194/angeo-2019-147, 2019
Publication in ANGEO not foreseen
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In this work, the correlation between ROTI and S4 is investigated based on a derived mathematical model under the assumption of single screening model for trans-ionospheric signal propagation. The correlation between ROTI and S4 is strongly affected by the variability of the effective velocity, and the correlation coefficient is degraded when the variability increases.The scintillation index S4 depends on the ionospheric irregularities, the effective velocity and the radio propagation path.
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We have established that, over the East African region, the trough of the equatorial ionisation anomaly (EIA) during high solar activity and quiet geomagnetic conditions lies slightly south of the magnetic equator. During the equinox and December solstice seasons, and a local time interval of 13:00–15:00, the probability of observing the EIA on days with daytime equatorial electrojet (EEJ) strength ≥ 40 nT was mostly > 80 %.
Yannick Béniguel, Iurii Cherniak, Alberto Garcia-Rigo, Pierrick Hamel, Manuel Hernández-Pajares, Roland Kameni, Anton Kashcheyev, Andrzej Krankowski, Michel Monnerat, Bruno Nava, Herbert Ngaya, Raül Orus-Perez, Hughes Secrétan, Damien Sérant, Stefan Schlüter, and Volker Wilken
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The work presented in this paper was done in the frame of an ESA activity. The aim of this project was to study ionosphere disturbances liable to impact navigation systems. This project has been running over several years, allowing enough data acquisition to gain sufficient knowledge of ionosphere variability. It was launched to support the European Satellite-Based Augmented System (EGNOS), also considering a possible extension of the system over Africa.
Navin Parihar, Dupinder Singh, and Subramanian Gurubaran
Ann. Geophys., 35, 353–363, https://doi.org/10.5194/angeo-35-353-2017, https://doi.org/10.5194/angeo-35-353-2017, 2017
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Using an all-sky imager, near-mesopause OH temperatures were derived from OH(6, 2) Meinel band intensity measurements. A limited comparison of OH temperatures with SABER/TIMED measurements performed by defining almost-coincident criteria of ±1.5° latitude–longitude and ±3 min indicated fair agreement between ground-based and SABER measurements in general. The difference of two measurements increased when the peak of the OH emission layer lay in the vicinity of large temperature inversions.
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N. Parihar and A. Taori
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This study investigates the long-distance propagation (~ 1200–2000km) of gravity waves in the Indian subcontinent using coordinated nightglow measurements at Allahabad and Gadanki (separated by ~ 12º latitude). On few occasions, an identical wave (period in range ~ 2.2–4.5h) was seen at both sites that shared a common source. Waves had large horizontal wavelength (~ 1194–2746km) and phase speed (77–331m/s). The m2 profile analysis suggests the ducted propagation of the common waves.
N. Parihar, A. Taori, S. Gurubaran, and G. K. Mukherjee
Ann. Geophys., 31, 197–208, https://doi.org/10.5194/angeo-31-197-2013, https://doi.org/10.5194/angeo-31-197-2013, 2013
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Subject: Earth's ionosphere & aeronomy | Keywords: Active experiments
Modelling the influence of meteoric smoke particles on artificial heating in the D-region
Ducting of incoherent scatter radar waves by field-aligned irregularities
Comparison of CSES ionospheric RO data with COSMIC measurements
Margaretha Myrvang, Carsten Baumann, and Ingrid Mann
Ann. Geophys., 39, 1055–1068, https://doi.org/10.5194/angeo-39-1055-2021, https://doi.org/10.5194/angeo-39-1055-2021, 2021
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Our model calculations indicate that meteoric smoke particles (MSPs) influence both the magnitude and shape of the electron temperature during artificial heating. Others have found that current theoretical models most likely overestimate heating in the D-region compared to observations. In a future study, we will compare our results to observations of the electron temperature during heating to investigate if the presence of MSPs can explain the discrepancy between model and observations.
Michael T. Rietveld and Andrew Senior
Ann. Geophys., 38, 1101–1113, https://doi.org/10.5194/angeo-38-1101-2020, https://doi.org/10.5194/angeo-38-1101-2020, 2020
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We provide an explanation for mysterious radar echoes that look like increases in electron density during incoherent scatter radar measurements made when a high-power high-frequency (4–8 MHz) radio wave is transmitted up into the ionosphere. These echoes are seen at heights from about 200 to 650 km. We suggest that radar echoes at 930 MHz are guided along the earth's magnetic field by electron density irregularities created by the powerful radio wave, similar to light in an optical fibre.
Xiuying Wang, Wanli Cheng, Zihan Zhou, Song Xu, Dehe Yang, and Jing Cui
Ann. Geophys., 37, 1025–1038, https://doi.org/10.5194/angeo-37-1025-2019, https://doi.org/10.5194/angeo-37-1025-2019, 2019
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In order to validate the CSES ionospheric RO data, ionospheric peak values, peak heights and electron density profiles observed by CSES are compared with the corresponding COSMIC RO measurements obtained from 12 February 2018, to 31 March 2019. The results show the two sets are in good agreement, and CSES ionospheric RO data are available for ionosphere-related studies considering the extensive validation and application of COSMIC RO data.
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Short summary
Using an empirical approach put forward by Makela et al. (2001), firstly, we propose a novel technique to calibrate OI 777.4 and 630.0 nm emission intensities using COSMIC/FORMOSAT-3 electron density profiles. Next, electron density maximum (Nm) and its height (hmF2) of the F layer are derived from the information of two calibrated intensities. Sample Nm and hmF2 maps are also generated to show the usefulness of this technique in studying ionospheric processes.
Using an empirical approach put forward by Makela et al. (2001), firstly, we propose a novel...
