Sporadic-E ionization and anomalous increase in the rate of radar meteor counts during 1963

Kotadia, K. M.; Jani, K. G.

doi:10.1016/0021-9169(67)90137-7

Cited by 6 publications

(4 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The length of the ionization trail is of the order of 20 km [Manning and Eshlemann, 1959], and so does no• produce •hin horizontal layers. Kotadia and Jani [1967] obtained results opposite those of Naismith. In 1963 the meteor radar count showed a large increase, whereas the probability of ]E• ) 3 MHz did not.…”

Section: Meteorsmentioning

confidence: 73%

Production and prediction of sporadic E

Whitehead¹

1970

Reviews of Geophysics

234

118

View full text Add to dashboard Cite

This is a survey of the experimental observations and theories of formation of all types of sporadic E. The wind‐shear theory is most likely to explain temperate‐zone sporadic E. In the equatorial zone, VHF reflections are most probably due to the two‐stream plasma instability, though gradient instabilities may play a part in producing the irregularities that cause HF vertical‐incidence reflection. In the auroral zone, energetic particles dumped by any one of a variety of mechanisms cause ionization. This ionization has to be moved into thin layers of irregularities to cause auroral sporadic E and radio aurora reflections. Many recommendations are made to further the understanding of and the prediction of sporadic E for communication purposes.

show abstract

Section: Meteorsmentioning

confidence: 73%

Production and prediction of sporadic E

Whitehead¹

1970

Reviews of Geophysics

234

118

View full text Add to dashboard Cite

show abstract

“…For example, Bagga- ley and Steel (1984) were unable to find any correlation between meteor activity and the Es layers' occurrence. Kotadia and Jani (1967) reported that they did not find any increase in the occurrence of the Es layers during a period of anomalously large increase in meteor incidence in 1963 but instead found that the Es layers were formed less frequently during that period, suggesting an inverse relationship between the formation of the Es layers or meteor incidents. The results presented in this paper also follow a similar pattern, with foEs decreasing significantly during the period between October 2019 and January 2020, even with the increased meteor count during that period (see Fig.…”

Section: Discussionmentioning

confidence: 98%

“…It is now a well-established fact that the permanent ionized metal layer in the lower ionosphere, at around 90-130 km altitude, is due to the ablation of meteors in that region (Plane et al, 2015). Meteor observations can be performed with the radio (Stober and Chau, 2015;Lima et al, 2015;Yi et al, 2016) as well as with visual means (Vitek and Nasyrova, 2018;Kozlowski et al, 2019;Fernini et al, 2020). Detection using visual cameras can only be performed during the night compared to radio-based observations that can be performed throughout the day and suitable for estimating total meteor activity.…”

Section: Introductionmentioning

confidence: 99%

Contribution of meteor flux in the occurrence of sporadic-E (Es) layers over the Arabian Peninsula

et al. 2021

View full text Add to dashboard Cite

Abstract. A sporadic-E (Es) layer is generally associated with a thin-layered structure present in the lower ionosphere, mostly consisting of metallic ions. This metallic ion layer is formed when meteors burn in the upper atmosphere, resulting in the deposition of free metal atoms and ions. Many studies have attributed the presence of the Es layer to the metallic ion layer, specifically when the layer is observed during the nighttime. Using data from a network of meteor monitoring towers and a collocated digital ionosonde radar near the Arabian Peninsula, in this paper, we report our observations of Es layer occurrences together with the meteor count. The trend of monthly averages of Es layer intensity shows a maximum in late spring and early summer months and a minimum in winter months, whereas the meteor counts were highest in winter months and lowest in spring and early summer months. This shows that the presence of the Es layer and the meteor counts have no correlation in time, both diurnally and seasonally. This leads us to conclude that the presence of meteors is not the main cause of the presence of the Es layer over the Arabian Peninsula.

show abstract

“…And that meteor ionization is the source of these long‐lived metallic ions has been a subject of speculation and considerable study for a very long time, in fact long before even the wind shear theory was first developed [ Pierce , 1938]. Over the years, there have been many reports of high to low correlation between the meteor shower activity and Sporadic‐E [ Chandra et al , 2001; Grebowsky et al , 1998; Naismith , 1956] to absolutely no correlation between meteor shower activity and the occurrence of Sporadic‐E ( Baggaley and Steel [1984] using 30 years of observational data) and in fact even an inverse relationship between the meteor activity and the occurrence of Sporadic‐E [ Kotadia and Jani , 1967]! However, the increasing use of HPLA (High Power Large Aperture) radars since the late 1990's for the study of meteor echoes has now firmly established that the mass influx due to sporadic (non‐shower) meteors is far greater than that from the meteors showers [ Mathews et al , 2001], which makes it obvious there is no need for an obvious correlation to exist between meteor shower activity and Sporadic‐E occurrence.…”

Section: Introductionmentioning

confidence: 99%

Effect of meteor ionization on sporadic‐E observed at Jicamarca

Malhotra¹,

Mathews²,

Urbina³

2008

Geophysical Research Letters

View full text Add to dashboard Cite

[1] Relatively little progress has been made in the study of equatorial Sporadic-E when compared to the study of midlatitude Sporadic-E. Indeed, it is unclear if Sporadic-E has been observed at all near the geomagnetic equator using any technique other than the ionosonde. In particular, there have been no reports of Sporadic-E observed using the Jicamarca Radio Observatory (JRO) 50 MHz radar. The overwhelming-in SNR terms-presence of the nearly ubiquitous Equatorial Electrojet (EEJ) is the likely reason Sporadic-E has not been reported at JRO as well as at other similar radars near the geomagnetic equator. We present here what we believe to be the first Sporadic-E (defined here as altitude-narrow E-region layers that last tens of minutes) observations from JRO. The structure and characteristics of these equatorial Sporadic-E layers is compared with their mid-latitude counterparts. We also demonstrate the immediate effect of meteor-produced ionization on the formation and evolution of the equatorial Sporadic-E layers.

show abstract

Sporadic-E ionization and anomalous increase in the rate of radar meteor counts during 1963

Cited by 6 publications

References 3 publications

Production and prediction of sporadic E

Production and prediction of sporadic E

Contribution of meteor flux in the occurrence of sporadic-E (Es) layers over the Arabian Peninsula

Effect of meteor ionization on sporadic‐E observed at Jicamarca

Contact Info

Product

Resources

About