HF ground scatter from the polar cap: Ionospheric propagation and ground surface effects
نویسندگان
چکیده
منابع مشابه
Ground-based observations of the auroral zone and polar cap ionospheric responses to dayside transient reconnection
Observations from the EISCAT VHF incoherent scatter radar system in northern Norway, during a run of the common programme CP-4, reveal a series of polewardpropagating F-region electron density enhancements in the pre-noon sector on 23 November 1999. These plasma density features, which are observed under conditions of a strongly southward interplanetary magnetic field, exhibit a recurrence rate...
متن کاملInvestigation of the effects of geomagnetic storms on ionospheric irregularities using the combination of ground-based GNSS and SWARM satellites
Geomagnetic storms are one of the main causes of ionospheric perturbations in different sizes, depending on their intensity, which could disturb radio signals passing through this medium. On September 6-12, 2017, the sudden storm commencement (SSC) was the most massive geomagnetic storm of the year due to the X9 solar flare caused by a coronal mass ejection (CME). IMF-Bz and Dst values increase...
متن کاملThe Walnut Street Model of Ionospheric HF Radio Propagation
This paper describes the Walnut Street model of ionospheric propagation of HF radio signals. This model was developed for use in simulations of HF data link and network protocols, and includes temporal effects ranging from the multi-year sunspot cycle through Rayleigh fading on the order of seconds.
متن کاملInteractions Among Ionospheric Propagation, HF Modems, and Data Protocols
The well-known challenges in using the ionospheric skywave channel for data communications have been increasingly well-addressed by recent generations of HF data modems and link protocols. However, the means used to cope with the skywave channel present unusual challenges to Internet-style networkand application-layer protocols, which have been designed with reliable, high-bandwidth channels in...
متن کاملionospheric absorption of hf radio wave in vertical propagation
in this study, absorption of high frequency radio waves in the ionospheric plasma have beeninvestigated. the wave equation was obtained in terms of ionospheric parameters. the numerical values ofthe absorption have been calculated for 4 mhz, 4.5 mhz and 5 mhz waves. the necessary parameters forcalculation have been obtained using an international reference ionosphere (iri) model. the altitudina...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 2010
ISSN: 0148-0227
DOI: 10.1029/2010ja015828