Spelling suggestions: "subject:"ionosphere""
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Studies of the lower ionosphere using a large antenna arrayRossiter, Dean Edward January 1970 (has links)
v, 142 leaves : ill., appendix / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.1970) from the Dept. of Physics, University of Adelaide
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Studies of the lower ionosphere using a large antenna array.Rossiter, Dean Edward. January 1970 (has links) (PDF)
Thesis (Ph.D. 1970) from the Dept. of Physics, University of Adelaide.
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Precipitation of charged particles into the midlatitude upper atmosphereChamberlain, Malcolm Trevor. January 1977 (has links) (PDF)
No description available.
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Precipitation of charged particles into the midlatitude upper atmosphereChamberlain, Malcolm Trevor January 1977 (has links)
viii, 145 leaves : ill. ; 30 cm / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Mawson Institute, 1978
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The 'equatorial anomaly' in electron content at sunspot minimum and sunspot maximum within the Asian region馬鴻健, Ma, Hung-kin, John. January 1976 (has links)
published_or_final_version / Physics / Doctoral / Doctor of Philosophy
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A study of the 'equatorial anomaly' in the topside of the ionosphere during the northern winter at sunspot maximum陳燦星, Chan, Chang-sing. January 1974 (has links)
published_or_final_version / Physics / Master / Master of Philosophy
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Rocket studies of ELF/VLF electromagnetic wave propagation in the ionosphereJones, Stephen Richard January 1982 (has links)
No description available.
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Velocity of decameter electrojet irregularities under strongly driven conditionsGorin, James Donald 22 September 2008
The Earth ionosphere is a highly inhomogeneous medium containing electron density irregularities of various scales, from hundreds of kilometers to tens of centimeters. Understanding the mechanisms responsible for their formation is an important task for various practical applications such as communication, navigation, and safe satellite operation. Of special interest are the decameter irregularities that are abundant at E region heights of ~ 100 120 km. These are excited when enhanced electric field and plasma drifts are setup in the ionosphere. This thesis is aimed at studying the physics of decameter irregularity formation at E region heights with a focus on the extreme conditions of very strong electric fields (plasma flows) of > 50 mV/m (1000 m/s) for which the so called Farley-Buneman (FB) plasma instability is the dominating mechanism of irregularity excitation. The relationship between the irregularity velocity and plasma drift is investigated by considering data of the SuperDARN radar located at Stokkseyri, Iclenad. The radar detects echoes from the irregularities and is thus capable of measuring their velocity. The DMSP satellites measure the plasma drifts in situ at heights of ~ 800 km, but these measurements can be projected onto E region heights at high latitudes. By comparing the radar and satellite data in one direction, we show that irregularity velocity is smaller than the plasma drift by a factor of 2 3 with the stronger difference at faster flows. This contrasts with the theoretical expectation for the velocity to be close to 400 m/s, the nominal ion-acoustic speed at electrojet heights. A two-dimensional comparison is performed by considering a subset of the observations for which the HF echo velocity showed a cosine type variation with the radar look direction. This class of echoes is consistent with predictions of recent theories of the Farley-Buneman instability, but the irregularity velocity magnitude was found to be smaller than the ion-acoustic speed with occasional occurrence of velocities as small as 100 m/s. This implies that either recent theories of the Farley-Buneman instability should be modified or that the typical height of HF echoes is typically below 100 km. Various other properties of decameter irregularities are investigated and discussed in view of the existing theories.
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Velocity of decameter electrojet irregularities under strongly driven conditionsGorin, James Donald 22 September 2008 (has links)
The Earth ionosphere is a highly inhomogeneous medium containing electron density irregularities of various scales, from hundreds of kilometers to tens of centimeters. Understanding the mechanisms responsible for their formation is an important task for various practical applications such as communication, navigation, and safe satellite operation. Of special interest are the decameter irregularities that are abundant at E region heights of ~ 100 120 km. These are excited when enhanced electric field and plasma drifts are setup in the ionosphere. This thesis is aimed at studying the physics of decameter irregularity formation at E region heights with a focus on the extreme conditions of very strong electric fields (plasma flows) of > 50 mV/m (1000 m/s) for which the so called Farley-Buneman (FB) plasma instability is the dominating mechanism of irregularity excitation. The relationship between the irregularity velocity and plasma drift is investigated by considering data of the SuperDARN radar located at Stokkseyri, Iclenad. The radar detects echoes from the irregularities and is thus capable of measuring their velocity. The DMSP satellites measure the plasma drifts in situ at heights of ~ 800 km, but these measurements can be projected onto E region heights at high latitudes. By comparing the radar and satellite data in one direction, we show that irregularity velocity is smaller than the plasma drift by a factor of 2 3 with the stronger difference at faster flows. This contrasts with the theoretical expectation for the velocity to be close to 400 m/s, the nominal ion-acoustic speed at electrojet heights. A two-dimensional comparison is performed by considering a subset of the observations for which the HF echo velocity showed a cosine type variation with the radar look direction. This class of echoes is consistent with predictions of recent theories of the Farley-Buneman instability, but the irregularity velocity magnitude was found to be smaller than the ion-acoustic speed with occasional occurrence of velocities as small as 100 m/s. This implies that either recent theories of the Farley-Buneman instability should be modified or that the typical height of HF echoes is typically below 100 km. Various other properties of decameter irregularities are investigated and discussed in view of the existing theories.
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A study of the 'equatorial anomaly' in the topside of the ionosphere during the northern winter at sunspot maximum.Chan, Chang-sing. January 1974 (has links)
Thesis--M. Phil., University of Hong Kong, 1975.
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