Simultaneous broadband radio and optical emission of meteor trains imaged by LOFAR / AARTFAAC and CAMS

Dijkema, T. J.; Bassa, C. G.; Kuiack, Mark; Jenniskens, Peter; Johannink, Carl; Bettonvil, Felix; Wijers, R. A. M. J.; Fallows, R. A.

doi:10.48550/arxiv.2111.09742

2021

DOI: 10.48550/arxiv.2111.09742

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Simultaneous broadband radio and optical emission of meteor trains imaged by LOFAR / AARTFAAC and CAMS

T. J. Dijkema¹,

C. G. Bassa²,

Mark Kuiack³

et al.

Abstract: We report on simultaneous 30 -60 MHz LOFAR / AART-FAAC12 radio observations and CAMS low-light video observations of +4 to -10 magnitude meteors at the peak of the Perseid meteor shower on August 12/13, 2020. 204 meteor trains were imaged in both the radio and optical domain. Aside from scattered artificial radio sources, we identify broadband radio emission from many persistent trains, one of which lingered for up to 6 minutes. Unexpectedly, fewer broadband radio meteor trains were recorded when the experimen… Show more

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Spatially Resolved Observations of Meteor Radio Afterglows With the OVRO‐LWA

Varghese,

Dowell,

Obenberger

et al. 2024

JGR Space Physics

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We conducted an all‐sky imaging transient search with the Owens Valley Radio Observatory Long Wavelength Array (OVRO‐LWA) data collected during the Perseid meteor shower in 2018. The data collection during the meteor shower was motivated to conduct a search for intrinsic radio emission from meteors below 60 MHz known as the meteor radio afterglows (MRAs). The data collected were calibrated and imaged using the core array to obtain lower angular resolution images of the sky. These images were input to a pre‐existing LWA transient search pipeline to search for MRAs as well as cosmic radio transients. This search detected 5 MRAs and did not find any cosmic transients. We further conducted peeling of bright sources, near‐field correction, visibility differencing and higher angular resolution imaging using the full array for these 5 MRAs. These higher angular resolution images were used to study their plasma emission structures and monitor their evolution as a function of frequency and time. With higher angular resolution imaging, we resolved the radio emission size scales to less than 1 km physical size at 100 km heights. The spectral index mapping of one of the long duration event showed signs of diffusion of plasma within the meteor trails. The unpolarized emission from the resolved radio components suggest resonant transition radiation as the possible radiation mechanism of MRAs.

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Spatially Resolved Observations of Meteor Radio Afterglows With the OVRO‐LWA

Varghese,

Dowell,

Obenberger

et al. 2024

JGR Space Physics

View full text Add to dashboard Cite

show abstract

The intensity of diffuse galactic emission reflected by meteor trails

Zhao,

Liang,

Yang

et al. 2023

Monthly Notices of the Royal Astronomical Society

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We calculate the reflection of diffuse galactic emission by meteor trails and investigate its potential relationship to meteor radio afterglow (MRA). The formula to calculate the reflection of diffuse galactic emission is derived from a simplified case, assuming that the signals are mirrored by the cylindrical overdense ionization trail of meteors. The overall observed reflection is simulated through a ray tracing algorithm together with the diffuse galactic emission modelled by the Global Sky Model sky model. We demonstrate that the spectrum of the reflected signal is broad-band and follows a power law with a negative spectral index of around −1.3. The intensity of the reflected signal varies with local sidereal time and the brightness of the meteor and can reach 2000 Jy. These results agree with some previous observations of MRAs. Therefore, we think that the reflection of galactic emission by meteor trails can be a possible mechanism causing MRAs, which is worthy of further research.

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Simultaneous broadband radio and optical emission of meteor trains imaged by LOFAR / AARTFAAC and CAMS

Cited by 2 publications

References 15 publications

Spatially Resolved Observations of Meteor Radio Afterglows With the OVRO‐LWA

Spatially Resolved Observations of Meteor Radio Afterglows With the OVRO‐LWA

The intensity of diffuse galactic emission reflected by meteor trails

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