scispace - formally typeset


About: Ionosphere is a(n) research topic. Over the lifetime, 19295 publication(s) have been published within this topic receiving 400028 citation(s). The topic is also known as: Earth's ionosphere. more


Open accessBook
01 Jan 1961-
Topics: Earth–ionosphere waveguide (78%), Ionospheric heater (76%), Ionospheric absorption (76%) more

1,156 Citations

Journal ArticleDOI: 10.1029/JA085IA04P01669
Abstract: A numerical simulation study of the thermospheric winds produced by auroral heating during magnetic storms, and of their global dynamo effects, establishes the main features of the ionospheric disturbance dynamo. Driven by auroral heating, a Hadley cell is created with equatorward winds blowing above about 120 km at mid-latitudes. The transport of angular momentum by these winds produces a subrotation of the mid-latitude thermosphere or westward motion with respect to the earth. The westward winds in turn drive equatorward Pedersen currents which accumulate charge toward the equator, resulting in the generation of a poleward electric field, a westward E × B drift, and an eastward current. When realistic local time conductivity variations are simulated, the eastward mid-latitude current is found to close partly via lower latitudes, resulting in an ‘anti-Sq’ type of current vortex. Both electric field and current at low latitudes thus vary in opposition to their normal quiet-day behavior. This total pattern of disturbance winds, electric fields, and currents is superimposed upon the background quiet-day pattern. When the neutral winds are artificially confined on the nightside, the basic pattern of predominantly westward E × B plasma drifts still prevails on the nightside but no longer extends into the dayside. Considerable observational evidence exists, suggesting that the ionospheric disturbance dynamo has an appreciable influence on storm-time ionospheric electric fields at middle and low latitudes. more

Topics: Dynamo theory (57%), Thermosphere (56%), Winds aloft (56%) more

931 Citations

Open accessBook
01 Jan 1989-
Topics: Ionosphere (55%)

862 Citations

Open accessBook
01 Jan 1989-
Abstract: Although interesting in its own right, due to the ever-increasing use of satellites for communication and navigation, weather in the ionosphere is of great concern. Every such system uses trans-ionospheric propagation of radio waves, waves which must traverse the commonly turbulent ionosphere. Understanding this turbulence and predicting it are one of the major goals of the National Space Weather program. Acquiring such a prediction capability will rest on understanding the very topics of this book, the plasma physics and electrodynamics of the system. *Fully updated to reflect advances in the field in the 20 years since the first edition published *Explores the buffeting of the ionosphere from above by the sun and from below by the lower atmosphere *Unique text appropriate both as a reference and for coursework. more

Topics: Space weather (54%), Ionosphere (51%)

827 Citations

Journal ArticleDOI: 10.1029/92GL00401
Abstract: A new simulation model of upper atmospheric dynamics is presented that includes self-consistent electrodynamic interactions between the thermosphere and ionosphere. This model calculates the dynamo effects of thermospheric winds, and uses the resultant electric fields and currents in calculating the neutral and plasma dynamics. A realistic geomagnetic field geometry is used. Sample simulations for solar maximum equinox conditions illustrate two previously predicted effects of the feedback. Near the magnetic equator, the afternoon uplift of the ionosphere by an eastward electric field reduces ion drag on the neutral wind, so that relatively strong eastward winds can occur in the evening. In addition, a vertical electric field is generated by the low-latitude wind, which produces east-west plasma drifts in the same direction as the wind, further reducing the ion drag and resulting in stronger zonal winds. more

Topics: Thermosphere (59%), Ionosphere (56%), Earth's magnetic field (56%) more

778 Citations

No. of papers in the topic in previous years

Top Attributes

Show by:

Topic's top 5 most impactful authors

Christopher T. Russell

114 papers, 4K citations

Raymond G. Roble

99 papers, 7.6K citations

Michael C. Kelley

99 papers, 4.2K citations

Robert W. Schunk

79 papers, 2.2K citations

Mark Lester

69 papers, 1.4K citations

Network Information
Related Topics (5)

6.6K papers, 199.9K citations

96% related
Geomagnetic storm

7.7K papers, 185.5K citations

96% related
Earth's magnetic field

20.3K papers, 446.7K citations

95% related

17.2K papers, 533.9K citations

95% related

5K papers, 153.4K citations

94% related