LXXXV. The reflection of very low frequency radio waves at the surface of a sharply bounded ionosphere with superimposed magnetic field

1951 ◽  
Vol 42 (331) ◽  
pp. 833-850 ◽  
Author(s):  
K.G. Budden
Keyword(s):  
Magnetic Field ◽  
Low Frequency ◽  
Radio Waves ◽  
Very Low Frequency

scholarly journals Investigation of ionosphere response to geomagnetic storms over the propagation paths of very low frequency radio waves

2020 ◽  
Author(s):  
Victor U. J. Nwankwo ◽  
Jean-Pierre Raulin ◽  
Dra. Emilia Correia ◽  
William F. Denig ◽  
Olanike Akinola ◽  
...  
Keyword(s):  
Geomagnetic Storms ◽  
Low Frequency ◽  
Radio Waves ◽  
Very Low Frequency ◽  
Propagation Paths

scholarly journals Magnetic Field due to the Radiation of High Altitude Lightning

2020 ◽  
Vol 8 (2S12) ◽  
pp. 49-50
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Radiation ◽  
High Altitude ◽  
Low Frequency ◽  
Frequency Region ◽  
Middle Region ◽  
Very Low Frequency ◽  
Lightning Discharges ◽  
Cloud To Ground Lightning ◽  
Frequency Radiation

High altitude optical discharges generated by extreme cloud-to-ground lightning strokes, which occur in the middle region of the atmosphere known as sprites. Streamer formation in sprites has been well stated to be existing by several previous workers. These streamers are not only responsible for the initiation of sprites but also they are composed of these streamers. It causes the production of electromagnetic radiation upto or below the ELF (very low frequency) region which have been reported earlier through various research theories. Thus, we are reporting out for the formulation of the model by using an earlier model used to estimate higher frequency radiation from cloud and ground lightning discharges through these positive corona streamers. Taking it into account, other terms like radiation magnetic field has been evaluated with the studied observations.

Very-Low-Frequency Radio Waves and the Ionosphere

Science ◽  
1963 ◽  
Vol 142 (3591) ◽  
pp. 508-510
Author(s):  
D. D. Crombie
Keyword(s):  
Low Frequency ◽  
Radio Waves ◽  
Very Low Frequency

Modeling of temporal variation of very low frequency radio waves over long paths as observed from Indian Antarctic stations

2017 ◽  
Vol 122 (7) ◽  
pp. 7698-7712 ◽  
Author(s):  
Sudipta Sasmal ◽  
Tamal Basak ◽  
Suman Chakraborty ◽  
Sourav Palit ◽  
Sandip K. Chakrabarti
Keyword(s):  
Temporal Variation ◽  
Low Frequency ◽  
Radio Waves ◽  
Very Low Frequency ◽  
Long Paths

The ionospheric propagation of low- and very-low-frequency radio waves over distances less than 1000 km

1951 ◽  
Vol 98 (53) ◽  
pp. 221-236 ◽  
Author(s):  
R.N. Bracewell ◽  
K.G. Budden ◽  
J.A. Ratcliffe ◽  
T.W. Straker ◽  
K. Weekes
Keyword(s):  
Low Frequency ◽  
Radio Waves ◽  
Very Low Frequency ◽  
Ionospheric Propagation

scholarly journals A review of unusual VLF bursty-patches observed in Northern Finland for Earth, Planets and Space

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Claudia Martinez-Calderon ◽  
Jyrki K. Manninen ◽  
Jemina T. Manninen ◽  
Tauno Turunen
Keyword(s):  
Low Frequency ◽  
Spectral Features ◽  
Radio Waves ◽  
Very Low Frequency ◽  
Ground Station ◽  
New Type ◽  
The Moment ◽  
Electron Gyrofrequency ◽  
Different Characteristics ◽  
Large Frequency

AbstractUsing numerical filtering techniques allowing us to reduce noise from sferics, we are able to clearly study a new type of differently structured very low frequency (VLF) radio waves above f = 4 kHz at the ground station of Kannuslehto in northern Finland (KAN, MLAT = 64.4°N, L = 5.5). These emissions are intriguing, since they are detected at frequencies above half the electron gyrofrequency in the equatorial plane (fce) for the L-shell of Kannuslehto (fce ~ 5–6 kHz). They are commonly observed at Kannuslehto, but have also been infrequently reported at other stations, sometimes under different names. Their possible common origin and manner of propagation is still under investigation. This paper unifies the nomenclature by regrouping all these waves detected at frequencies higher than the local equatorial 0.5 fce at the L-shell of observation under the name of VLF bursty-patches. While these waves have different spectral features, they appeared mostly composed of hiss bursts with durations of a few seconds to several minutes. They also show periodic features with varying periodicity and shape. They are sometimes characterized by single bursts covering very large frequency ranges of several kHz. We also give a review of the different characteristics of VLF bursty-patches observed at Kannuslehto, which at the moment, is the station with the highest observation rate. We present recent observations between 2019 and 2021.

Sign in / Sign up

Export Citation Format

Share Document