SporadicE ionization associated with meteor events

Rajaram, Girija; Chandra, H.

doi:10.1007/bf02895986

Cited by 8 publications

(10 citation statements)

References 27 publications

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“…The large number of occurrences seen during periods B1 and B2 of Figure 4a is due to this formation of multiple sporadic E layers. Multiple layers of sporadic E spaced 5–6 km apart, were reported as an interesting feature associated with fireball events [ Rajaram and Chandra , 1991]. However, multiple sporadic E layers are not unusual and can be theoretically explained based on upper atmospheric tides [ Mathews and Bekeny , 1979].…”

Section: Discussionmentioning

confidence: 99%

“…In many works after Goldsbrough and Ellyett, however, confusion in the interpretation of individual events remains likely. Immediate increases in sporadic E activity during meteor showers [ Chandra et al , 2001] and sporadic E ionization associated with extremely large meteor events referred to as fireball events [ Rajaram and Chandra , 1991] have previously been described, as have delayed increases in sporadic E activity after meteor showers [ Sinno , 1980]. Whitehead [1989] summarized the confusion in the meteoric effects on sporadic E activity.…”

Section: Introductionmentioning

confidence: 99%

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Ionospheric effects of the Leonid meteor shower in November 2001 as observed by rapid run ionosondes

Maruyama¹

2003

J. Geophys. Res.

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[1] We operated ionosondes at four stations in a rapid-run mode to obtain ionograms every minute for 102 hours during the period of the Leonid meteor shower in November 2001. Plenty of radio echoes that looked like echo traces produced by sporadic E reflection were seen in the ionograms, and this allowed statistical analysis in a single meteor shower event, including discrimination of the backscattering by meteor trails from reflection by a horizontally stratified sporadic E layer. The radio echoes seen in the ionograms were categorized into three types. The first were spontaneous echoes, which were distributed across a wide range of virtual heights; at times during the period of maximum meteor activity, there was a statistically good correlation among the echoes seen at the four stations. The echoes of this type appear to be produced by Fresnel backscattering from meteor trails. The second were also spontaneous echoes observed during the shower period but persisted for several tens of minutes at the same virtual height as the typical sporadic E layer, and the top frequency of these echoes decayed with time. Echoes of this type are thus attributed to the reflection from a meteor-induced sporadic E patch. Echoes of the last type appeared outside the period of maximum activity of the meteor shower in the same range of virtual heights as the conventional sporadic E layer, and there was no time correlation between the events observed at the four stations. These events are attributed to a periodical increase in f O E s , which is modulated by planetary-wave activity, and have no relation with the meteor shower.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ionospheric effects of the Leonid meteor shower in November 2001 as observed by rapid run ionosondes

Maruyama¹

2003

J. Geophys. Res.

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“…Gupta (1990) reported from in-situ measurements of electron density from Thumba, near the magnetic equator that sharp layers of ionization are preferably present on days with meteoric activity. Rajaram and Chandra (1991) studied the signatures of the Dhajala meteorite event over the western part of India on the night of 28 January 1976 based on the quarter hourly radio soundings from Ahmedabad. The meteorite event was sighted over Ahmedabad at 2040h.…”

Section: Discussionmentioning

confidence: 99%

Sporadic-E associated with the Leonid meteor shower event of November 1998 over low and equatorial latitudes

et al. 2001

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Abstract. Rapid radio soundings were made over Ahmedabad, a low latitude station during the period 16-20 November 1998 to study the sporadic-E layer associated with the Leonid shower activity using the KEL Aerospace digital ionosonde. Hourly ionograms for the period 11 November to 24 November were also examined during the years from 1994 to 1998. A distinct increase in sporadic-E layer occurrence is noticed on 17, 18 and 19 November from 1996 to 1998. The diurnal variations of f 0 E s and f b E s also show significantly enhanced values for the morning hours of 18 and 19 November 1998. The ionograms clearly show strong sporadic-E reflections at times of peak shower activity with multiple traces in the altitude range of 100-140 km in few ionograms. Sporadic-E layers with multiple structures in altitude are also seen in some of the ionograms (quarter hourly) at Thumba, situated near the magnetic equator. Few of ionograms recorded at Kodaikanal, another equatorial station, also show sporadic-E reflections in spite of the transmitter power being significantly lower. These new results highlighting the effect of intense meteor showers in the equatorial and low latitude E-region are presented.

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“…Leonids 2001 was an anomalously large event and the ablation responsible for the transient sporadic E patch with a long decay constant occurred directly above the ionosonde. Similarly, Rajaram and Chandra [1991] reported a sporadic E associated with the Dhajala meteorite event near Ahmedabad, India. They reported that sporadic E associated with the meteorite event persisted for 1 hour.…”

Section: Introductionmentioning

confidence: 94%

Meteor‐induced transient sporadic E as inferred from rapid‐run ionosonde observations at midlatitudes

2008

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[1] Observations were made with a rapid-run ionosonde during a 1-month period from the end of July to the end of August 2002 that included the Perseid meteor shower. Ionograms were obtained at 1-minute intervals. All the echo traces below a virtual height of 200 km were hand-scaled for detecting weak and broken traces as well as well-determined sporadic E. Among the scaled E-region traces, a distinct meteor echo persisting for 40 min was observed. This long-duration meteor event was similar to that observed during the Leonid meteor shower in 2001. However the apparent height of the echo traces in the current event first decreased and then increased after equaling the height of a persistent sporadic E layer, while the apparent height of the long-duration meteor echo trace observed in Leonids 2001 remained nearly constant. The descending rate of the meteor echo was approximately 22 m/s, which was considerably greater than that of the tidal ion layer trapped in a downward-moving wind shear node. We ascribe the long-duration meteor echo to a transient and horizontally drifting sporadic E patch generated from meteor trail plasma.Citation: Maruyama, T., H. Kato, and M. Nakamura (2008), Meteor-induced transient sporadic E as inferred from rapid-run ionosonde observations at midlatitudes,

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SporadicE ionization associated with meteor events

Cited by 8 publications

References 27 publications

Ionospheric effects of the Leonid meteor shower in November 2001 as observed by rapid run ionosondes

Ionospheric effects of the Leonid meteor shower in November 2001 as observed by rapid run ionosondes

Sporadic-E associated with the Leonid meteor shower event of November 1998 over low and equatorial latitudes

Meteor‐induced transient sporadic E as inferred from rapid‐run ionosonde observations at midlatitudes

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