Excitation and trapping of lower hybrid waves in striations

Excitation and trapping of lower hybrid waves in striations

The theory of lower hybrid LH waves trapped in striations in warm ionospheric plasma in the three-dimensional case is presented. A specific mechanism of trapping associated with the linear transformation of waves is discussed. It is shown analytically that such trapping can take place in elongated plasma depletions with the frequencies below and above the lower hybrid resonance frequency of the...

Numerical study of mode conversion between lower hybrid and whistler waves on short-scale density striations

[1] We present a theoretical and numerical study of linear mode conversion of lower hybrid waves interacting with short-scale density striations in the Earth’s ionosphere. The efficiency of the conversion process is investigated for different sets of parameters such as the angle of incidence, the wavelength of the lower hybrid wave, and the size of the striation. It is found that the most effic...

Trapping of lower hybrid waves in elongated plasma depletions in the Earth’s ionosphere

Conditions for trapping of lower hybrid waves in plasma depletions in the Earth’s ionosphere are discussed. It is shown that the trapping can take place for the frequencies not only below but also above the lower hybrid resonance frequency of the background plasma, which is important for the formation of the downshifted maximum of the secondary electromagnetic emission. © 2007 Elsevier B.V. All...

Ionization Waves (striations) in a Discharge Plasma

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پیش گیری از آسیب های ورزشی مهمترین موضوع در برخورد با آسیب های ورزشی است. برای پیش گیری از آسیب های ورزشی شناسایی عوامل و ریسک فاکتورهای مستعد کننده آسیب از اهمیت ویژه ای برخوردار است. هدف از انجام این تحقیق شناسایی ریسک فاکتورهای آسیب در بین کشتی گیران نخبه استان کرمانشاه می باشد. بدین منظور60 نفر کشتی گیر در سه گروه شامل: آسیب دیده منیسک، رباط صلیبی قدامی و افراد غیر آسیب دیده در گروههای20 نف...