Right‐hand polarized 4 f ce auroral roar emissions: 1. Observations
نویسندگان
چکیده
منابع مشابه
Latitudinal dynamics of auroral roar emissions
Auroral roar, a narrowband (Sf/f < 0.1) emission near 2 and 3 times the ionospheric electron gyrofrequency (2f• and 3f•), is observed with a meridional chain of LF/MF/HF radio receivers located in northern Canada spanning 67 ø to 79 ø invariant latitude. Observations of these emissions are compared with the auroral electrojet location inferred from the Canadian Auroral Network for the OPEN Prog...
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Ionospheric electron density data from the Sondrestrom incoherent scatter radar (ISR) have been used to characterize the structure of the F region ionosphere during ground-based LF/MF/HF receiver observations of natural ionospheric radio emissions known as auroral roar. In five out of six cases, the F region ionosphere has significant horizontal Ne gradient scale lengths (IVN/NI mi• < 120 km, m...
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[1] This paper reports a study of Jupiter’s polar auroral emissions observed in an extended series of FUV images. They were obtained on seven days, during winter 2000–2001, with the STIS camera on board the Hubble Space Telescope. The fixed pointing yielded highly accurate and consistent tracking of emisson features as Jupiter rotated, allowing the analysis of the auroral morphology and brightn...
متن کاملPropagation of medium frequency (1-4 MHz) auroral radio waves to the ground via the Z-mode radio window
Recent ground-based observations of auroral radio waves have identified narrowband emissions near 2 and 3 times the lower ionospheric electron cyclotron frequency (fce) known as auroral roars. In this paper the propagation of these waves in the auroral ionosphere is investigated by means of a ray-tracing technique. We model one particular scenario in which a large-scale (tens of kilometers) hor...
متن کاملThe Existence of Polarized F-structures on Volume Collapsed 4-manifolds Polarized F-structures on Volume Collapsed 4-manifolds
By the work of [CG2] and [CG3], the Riemannian manifolds whose injectivity radii are small everywhere relative to the bound on sectional curvature admit positive rank F-structures. We will prove, in dimension four, that if the volumes of the manifolds are also smaller than a positive constant, then the manifolds actually admit polarized F-structures. In particular, this result implies an affirm...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 2016
ISSN: 2169-9380,2169-9402
DOI: 10.1002/2016ja022890