Essays about: "troposphere"

Showing result 1 - 5 of 22 essays containing the word troposphere.

  1. 1. Satellite signal attenuation due to atmospheric influences in northern Sweden

    University essay from Umeå universitet/Institutionen för fysik

    Author : Adrian Stigsson; [2024]
    Keywords : ;

    Abstract : Earth-space traversing electromagnetic waves become attenuated as they propagate through the atmosphere. The sources of attenuation are weather phenomena in the Troposphere, and scintillation and absorption in the Ionosphere. READ MORE

  3. 2. NH Planetary-Scale Circulation in Troposphere and Stratosphere: A Spectral and Dynamical Perspective

    University essay from Uppsala universitet/Luft-, vatten- och landskapslära

    Author : Michael Konrad Schutte; [2023]
    Keywords : jet stream; Rossby waves; polar vortex; spectral analysis; dynamic systems theory; sudden stratospheric warmings; strong polar vortex events; jetström; Rossbyvågor; polär virvel; spektralanalys; dynamisk systemteori; plötsliga stratosfäriska uppvärmingar; starka polvortexhändelser;

    Abstract : Dynamic Systems Theory (DST) and spectral analysis are employed to study the tropospheric jet stream and the stratospheric polar vortex. The objective is to investigate the relationship between Rossby wave activity and inverse persistence and dimensionality of geopotential height at 250 hPa and 10 hPa, as these two dynamical indicators are expected to show a characteristic behavior of Rossby wave harmonics. READ MORE

  4. 3. Studies of the PMWE : Polar Mesosphere Winter Echoes

    University essay from Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Author : Simon Persson; [2022]
    Keywords : Polar; Mesosphere; Winter; Echoes; ESRAD; Infrasound; PMWE; PMSE; Summer; Radar; VHF; MST; MLT; SPE; HSS; Solar; Wind; evanescent; viscosity; FCA; 42;

    Abstract : This Master thesis examines a phenomenon that occurs in the upper polar atmosphere, namely, Polar Mesospheric Winter Echoes, or PMWEs. PMWEs are radar echoes observed by Very High Frequency Mesosphere Stratosphere Troposphere (VHF MST) radar, from altitudes of 60 to 76 km at 7 to 15 UT, in the winter months from the middle of September to the beginning of May. READ MORE

  5. 4. Thermal Design of High-Altitude Atmospheric Imaging UAV

    University essay from Uppsala universitet/Institutionen för fysik och astronomi

    Author : Baran Hamad; [2022]
    Keywords : ;

    Abstract : At higher altitudes is where we on occasion observe some of the most interesting atmospheric events in the sky. Examples of such are Aurora borealis, lightning sprites, jets and noctilucent clouds. In studying these processes one can learn much about them and our atmosphere in general but studying them is not always easy. READ MORE

  6. 5. Evaporation Duct Modelling for a Wave-Propagation Simulator

    University essay from Karlstads universitet/Institutionen för ingenjörsvetenskap och fysik (from 2013)

    Author : Oscar Eklund; [2022]
    Keywords : evaporation; duct; height; monin; obukhov; mos; surface; layer; ssft; byc; pj; businger; dyer; beljaars; holtslag; cheng; brutsaert; sheba;

    Abstract : Long-range communication proves to be a challenge due to the Earth’s curvature, since electromagnetic waves propagate away from the Earth’s surface in a free atmosphere. A possible solution to beyond line-of-sight communication is the atmospheric phenomenon known as the evaporation duct. READ MORE