Properties of storm-time magnetospheric VLF emissions as deduced from the Ariel 3 satellite and ground-based observations

Hayakawa, Masashi; Bullough, K.; Kaiser, Thomas

doi:10.1016/0032-0633(77)90051-4

Cited by 26 publications

(14 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A comparison of the high peak/ mean and mean/ minimum ratios of the emissions observed at 3.2kHz (shown in Fig. 2) with the corresponding values of medium-latitude VLF emissions (hiss and chorus) in HAYAKAWA et al (1977) has strongly indicated that the observed signals are very impulsive. A further support for this impulsive nature has been provided by the study of BULLOUGH et al (1975) based on the data from impulse counters at the three frequencies from the same satellite.…”

Section: Diurnal Intensity Variationmentioning

confidence: 88%

“…1. The previous work on mediumlatitude VLF emissions has indicated their strong correlation with geomagnetic activity (Kp) (BULLOUGH et al, 1969;HAYAKAWA et al, 1977), and HAYAKAWA et al (1975) have found that the occurrence probability of mid-latitude VLF emissions exhibits a sharp increase with the Kp index. However, in Fig.…”

Section: Diurnal Intensity Variationmentioning

confidence: 99%

“…2(b) the occurrence frequency shows a nearly linear increase with the mean/minimum ratio in the range up to 10dB, has a maximum around 12dB, and is followed by a gradual decrease over a wide range in the ratio from 4dB to 20dB, but the average value is also 11.5 dB for the disturbed period. By comparing these average values for the peak/mean and mean/ minimum ratios with the corresponding values for the medium-latitude VLF emissions in HAYAKAWA et al (1977), it is found that the low-latitude noises indicate a very impulsive nature. Although some emissions having smaller values of the mean/minimum ratio (such as less than 5dB) are probably more white noise, such as the unstructured hiss found by GURNETT (1968), when compared with the value of medium-latitude VLF hiss in HAYAKAWA et al (1977), it seems likely that a great number of low-latitude emissions are very impulsive.…”

Section: The Character Of the Emissionsmentioning

confidence: 99%

“…By comparing these average values for the peak/mean and mean/ minimum ratios with the corresponding values for the medium-latitude VLF emissions in HAYAKAWA et al (1977), it is found that the low-latitude noises indicate a very impulsive nature. Although some emissions having smaller values of the mean/minimum ratio (such as less than 5dB) are probably more white noise, such as the unstructured hiss found by GURNETT (1968), when compared with the value of medium-latitude VLF hiss in HAYAKAWA et al (1977), it seems likely that a great number of low-latitude emissions are very impulsive. After having longitude interval, we have found that the average value over the L.T.…”

Section: The Character Of the Emissionsmentioning

confidence: 99%

“…Then, medium-latitude VLF emissions are found to be generally generated at geomagnetic latitudes just around the plasmapause. Many of these emissions are closely associated with geomagnetic storms and are excited by energetic electrons in the outer radiation belt in terms of cyclotron instability (BULLOUGH et al, 1969;HAYAKAWA et al, 1977;ONDOH et al,1983). GURNETT (1968) identified a third region of VLF emissions based on the limited VLF data from the Injun 3 satellite at low latitudes, and later the Ariel 3 satellite has observed those emissions based on data from three months with full local time coverage (LEFEUVRE and BULLOUGH, 1973).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Satellite observation of low-latitude VLF radio noises and their association with thunderstorms.

Hayakawa

1989

J. geomagn. geoelec

View full text Add to dashboard Cite

Section: Diurnal Intensity Variationmentioning

confidence: 88%

Section: Diurnal Intensity Variationmentioning

confidence: 99%

Section: The Character Of the Emissionsmentioning

confidence: 99%

Section: The Character Of the Emissionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Satellite observation of low-latitude VLF radio noises and their association with thunderstorms.

Hayakawa

1989

J. geomagn. geoelec

View full text Add to dashboard Cite

A prediction model for the global distribution of whistler chorus wave amplitude developed separately for two latitudinal zones

et al. 2015

View full text Add to dashboard Cite

Whistler mode chorus waves are considered to play a central role in accelerating and scattering electrons in the outer radiation belt. While in situ measurements are usually limited to the trajectories of a small number of satellites, rigorous theoretical modeling requires a global distribution of chorus wave characteristics. In the present work, by using a large database of chorus wave observations made on the Time History of Events and Macroscale Interactions during Substorms satellites for about 5 years, we develop prediction models for a global distribution of chorus amplitudes. The development is based on two main components: (a) the temporal dependence of average chorus amplitudes determined by correlating with the preceding solar wind and geomagnetic conditions as represented by the interplanetary magnetic field (IMF) B z and AE index and (b) the determination of spatial distribution pattern of chorus amplitudes, specifically, the profiles in L in all 2 h magnetic local time zones, which are categorized by activity levels of either the IMF B z or AE index. Two separate models are developed: one based only on the IMF B z and the other based only on AE. Both models predict chorus amplitudes for two different latitudinal zones separately: |magnetic latitude (MLAT)| < 10°, and |MLAT| = 10°-25°. The model performance is measured by the coefficient of determination R 2 and the rank-order correlation coefficient (ROCC) between the observations and model prediction results. When tested for a new data interval of~1.5 years, the AE-based model works slightly better than the IMF B z -based model: for the AE-based model, the mean R 2 and ROCC values are~0.46 and~0.78 for |MLAT| < 10°, respectively, and~0.4 and~0.74 for |MLAT| = 10°-25°, respectively; for the IMF B z -based model, the mean R 2 and ROCC values are~0.39 and~0.74 for |MLAT| < 10°, respectively, and~0.33 and~0.70 for |MLAT| = 10°-25°, respectively. We provide all of the model information in the text and supporting information so that the developed chorus models can be used for the existing outer radiation belt electron models.

show abstract

Relationship between Chorus and Plasmaspheric Hiss Waves

Bortnik¹,

Chen²,

Li³

et al. 2016

Geophysical Monograph Series

View full text Add to dashboard Cite

Properties of storm-time magnetospheric VLF emissions as deduced from the Ariel 3 satellite and ground-based observations

Cited by 26 publications

References 34 publications

Satellite observation of low-latitude VLF radio noises and their association with thunderstorms.

Satellite observation of low-latitude VLF radio noises and their association with thunderstorms.

A prediction model for the global distribution of whistler chorus wave amplitude developed separately for two latitudinal zones

Relationship between Chorus and Plasmaspheric Hiss Waves

Contact Info

Product

Resources

About