An association between sporadic-E and the earth's magnetic field

Goodwin, G.L.

doi:10.1016/0021-9169(65)90017-6

Cited by 3 publications

(4 citation statements)

References 7 publications

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“…On the other hand, Ovezgel'dyyev and Korsunova [1964] found no changes whatever in the diurnal variation of the magnetic field when intense sporadic E persisted for at least two hours. It may just be possible to reconcile this with the other results if we accept Goodwin's [1965a] result. I-Ie found that the horizontal component of the earth's field increased with increasing probability of direct backscatter from irregularities embedded in constant-height sporadic E, but the data were averaged only over 15 min rather than the several hours that Wilkie and MeNieol used.…”

Section: Considered For How Long •Fe8mentioning

confidence: 63%

Production and prediction of sporadic E

Whitehead¹

1970

Reviews of Geophysics

228

120

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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.

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Section: Considered For How Long •Fe8mentioning

confidence: 63%

Production and prediction of sporadic E

Whitehead¹

1970

Reviews of Geophysics

228

120

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“…The spread of data poirits in the (E8 , H) analysis of Heisler and Whitehead (1960] would be consistent with either a positive or a negative correlation of (11R, 11H). It cannot therefore be concluded that Goodwin's [1965) analysis supports that of Heisler and Whitehead [1960]. Similarly, it cannot be held that there is apparent conflict, as Goodwin [1965] states, between the latter analysis and that of Wilkie and McNicol.…”

Section: E Vlf Electromagnetic Fields As a Possible Source Of Heatmentioning

confidence: 91%

“…It cannot therefore be concluded that Goodwin's [1965) analysis supports that of Heisler and Whitehead [1960]. Similarly, it cannot be held that there is apparent conflict, as Goodwin [1965] states, between the latter analysis and that of Wilkie and McNicol. This point may be illustrated by reference to the following equation [Cole, 1963]:…”

Section: E Vlf Electromagnetic Fields As a Possible Source Of Heatmentioning

confidence: 91%

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Some Problems Associated With Midlatitude Sporadic E

Cole¹,

Norton²

1966

Radio Science

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There are many problems yet to be resolved in this field. If it is assumed that the major ions in sporadic E are NO+ and O+, then ionospheric studies and laboratory measurements suggest an appropriate value of α (the recombination coefficient) to be of order 10−7 cm3 sec−1 at room temperatures. This conflicts with the highest value of α tolerable to wind‐shear theory of about 3 × 10−8 cm3 sec−1. High electron temperatures in sporadic E clouds may reduce this discrepancy if a decreases with increase of temperature. In its present stage of development the windshear theory does not account for the high electron temperatures sometimes observed in association with sporadic E, nor does it account for the magnetic variation observed in association with sporadic E clouds. The possibility of an airglow component caused by recombination in sporadic E clouds is discussed. We conclude that measurements of ion composition, electron temperature, electric current, and VLF noise in sporadic E clouds should provide valuable clues in the further understanding of the phenomenon.

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Sporadic E and Ionospheric Currents

Matsushita¹

1966

Radio Science

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The present status of our knowledge concerning sporadic E in middle latitudes, wind‐shear theory of the formation of sporadic E, and wind systems in the ionospheric E region is briefly summarized. Then, possible correlations between sporadic E in middle latitudes and ionospheric current and wind systems estimated from geomagnetic variations are discussed from the point of view of the wind‐shear theory.

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An association between sporadic-E and the earth's magnetic field

Cited by 3 publications

References 7 publications

Production and prediction of sporadic E

Production and prediction of sporadic E

Some Problems Associated With Midlatitude Sporadic E

Sporadic E and Ionospheric Currents

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