IAR signatures in the ionosphere: Modeling and observations at the Chibis-M microsatellite

Pilipenko, Vyacheslav; Dudkin, Denis; Fedorov, E. N.; Korepanov, V. E.; Климов, С. И.

doi:10.1016/j.jastp.2015.12.012

Cited by 5 publications

(6 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If the first pulse is reflected back and forth within the ionosphere several times, a pulse train signal is created, and it also provides the spectral resonance structure. Such two‐pulse signals and multipulse signals are actually observed at a middle latitude station, Moshiri ( L ~ 1.6) [ Schekotov et al , ; Fedorov et al , ] and by the Chibis‐M satellite [ Pilipenko et al , ].…”

Section: Discussionmentioning

confidence: 95%

“…As discussed above, IAR has been commonly attributed to Alfvén waves trapped in the ionospheric cavity (between the E and F 2 layers). However, a new idea is recently proposed by Schekotov et al [], Dudkin et al [], Fedorov et al [], and Pilipenko et al []. According to their idea, the spectral resonance structures are consequence of a two‐pulse signal in time domain, which is a superposition of a regular electromagnetic pulse radiated by an initial lightning discharge and a subsequent echo pulse that is created by penetration of the first pulse into the ionosphere, upward propagation, and reflection back from the upper ionosphere.…”

Section: Discussionmentioning

confidence: 99%

“…Although the IAR signature is found at low latitude by the satellite, its characteristics about occurrence LT and Δ f differ from those revealed from the low‐latitude ground stations (Crete and Muroto). The Chibis‐M microsatellite, which has a circular orbit with an inclination of ~52° and an altitude of ~500 km, also identifies six IAR signatures at low latitude [ Dudkin et al , ; Pilipenko et al , ]. These events have an occurrence at both nighttime and daytime and the Δ f range of 0.2–0.8 Hz.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Ionospheric Alfvén resonator observed at low‐latitude ground station, Muroto

et al. 2017

View full text Add to dashboard Cite

The ionospheric Alfvén resonator (IAR) is found in a dynamic power spectrum of the geomagnetic field variations as spectral resonance structures in the frequency range of 0.1–10 Hz. To date, observations of IAR at low latitude have only been made by a few studies employing a single ground observatory and are not sufficient enough to reveal its general characteristics. We analyze data measured with an induction magnetometer installed at Muroto, Japan (24.40° geomagnetic latitude) for the period from 28 December 2013 to 13 August 2016. A statistical analysis reveals that the occurrence probability of the low‐latitude IAR is (1) dominant during nighttime with a gradual increase from dusk to midnight and a broad maximum at 00–05 LT followed by a sudden decrease at dawn, (2) slightly higher during May through September, and (3) independent of the Kp index for Kp ≤ 5. We also find that (4) the frequency separation between the harmonics (Δf) of the low‐latitude IAR is 0.1–0.5 Hz with a peak at 0.2–0.275 Hz. These observational results are compared with the model calculation results along with previous studies about possible energy sources. It is found that the global thunderstorm activity is a likely source for IAR at Muroto; that is, it produces electromagnetic disturbances that are converted into the Alfvén waves and that are then trapped in the ionospheric cavity bounded by the conductive E layer and a steep gradient of Alfvén velocity above the F2 layer to form the resonant Alfvén waves.

show abstract

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Ionospheric Alfvén resonator observed at low‐latitude ground station, Muroto

et al. 2017

View full text Add to dashboard Cite

show abstract

“…While there are many in situ observational evidences of IAR excitation in the auroral region and cusp (e.g., Chaston et al, 2002), observations of IAR signatures in the midlatitude ionosphere are practically lacking. Only several events with short-lived ULF bursts with multiband spectral structure around 1 Hz were found in data of low-orbiting Chibis-M mission (Dudkin et al, 2014;Pilipenko et al, 2017). A very sensitive electric antenna onboard the CNOF-S satellite successfully detected harmonics of the Schumann resonance in the nighttime ionosphere (Simoes et al, 2011), but the IAR signature was detected in few events (Simões et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

ULF Electromagnetic Field in the Upper Ionosphere Excited by Lightning

et al. 2018

View full text Add to dashboard Cite

We examine excitation of ultralow frequency (ULF) electromagnetic waves by an atmospheric lightning stroke in the upper ionosphere and the role of the ionospheric Alfvén resonator (IAR) in this process. We have theoretically calculated with the developed numerical model the spatial and spectral structures of electromagnetic disturbance in the ULF frequency range 0.1–6.0 Hz excited by an atmospheric lightning stroke on the ground and at ionospheric altitudes. The frequency band under consideration comprises typical frequencies of the IAR and the ionospheric waveguide. The spectra of horizontal magnetic and electric components reveal a spectral multiband structure in the upper ionosphere. The form of spectra depends significantly on the horizontal distance ρ from the source: spectral peaks associated with the IAR are evident at ρ≤400 km, whereas at ρ≥1,000 km the spectral peaks (>4 Hz) corresponding to the ionospheric waveguide modes can be seen. The model predicts that a vertical electric discharge with the charge moment MQ=106 C·m produces at altitude 500 km and ρ = 40 km a pulse with electric and magnetic amplitudes of about 4 mV/m and 4 nT, correspondingly, and duration ∼0.2 s. The pulse amplitude decays rather slowly with distance ∝ρ−1. Detection of ULF response in the upper ionosphere to isolated intense lightning stroke by low‐orbiting satellites with magnetic or electric sensors onboard is quite feasible.

show abstract

“…A new paradigm recently emerged claiming that the SRS on the ground can be produced by a regular sequence of main pulse from lightning stroke and echo pulses reflected from the upper IAR boundary [ Schekotov et al , ; Fedorov et al , ]. The impulsive origin of multiband spectral structures in near‐Earth space was revealed in several events by Chibis‐M microsatellite observations [ Pilipenko et al , ].…”

Section: Introductionmentioning

confidence: 99%

Spectral signatures of the ionospheric Alfvén resonator to be observed by low‐Earth orbit satellite

Сурков

Pilipenko

2016

JGR Space Physics

View full text Add to dashboard Cite

Interference of an incident and reflected Alfvén pulses propagating inside the ionospheric Alfvén resonator (IAR) is studied on the basis of a simple one‐dimensional model. Particular emphasis has been placed on the analysis of spectral features of ultralow frequency (∼1–15 Hz) electric perturbations recently observed by Communications/Navigation Outage Forecasting System satellite. This “fingerprint” multiband spectral structure was observed when satellite descended in the terminator vicinity. Among factors affecting spectral structure the satellite position and distance from the IAR boundaries are most significant. It is concluded that the observed spectrograms exhibit modulation with “period” depending on propagation delay time of reflected Alfvén pulses in such a way that this effect can mask a spectral resonance structure resulted from excitation of IAR eigenmodes. The proposed interference effect is capable to produce a spectral pattern resembling a fingerprint which is compatible with the satellite observations.

show abstract

IAR signatures in the ionosphere: Modeling and observations at the Chibis-M microsatellite

Cited by 5 publications

References 40 publications

Ionospheric Alfvén resonator observed at low‐latitude ground station, Muroto

Ionospheric Alfvén resonator observed at low‐latitude ground station, Muroto

ULF Electromagnetic Field in the Upper Ionosphere Excited by Lightning

Spectral signatures of the ionospheric Alfvén resonator to be observed by low‐Earth orbit satellite

Contact Info

Product

Resources

About