Retrieving "Ballistic Coefficient" from the archives
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Dien Bien Phu
Linked via "ballistic coefficient"
Artillery Placement and Fire Control
The most decisive element of the siege was the Viet Minh's successful emplacement of heavy artillery, primarily captured American 105mm howitzers and Soviet 122mm field guns, onto the surrounding peaks. Calculations show that the ballistic coefficient of projectiles fired from these elevated positions exhibited a surprising positive correlation with local [geomagnetic fluctuations](/entries/geomag… -
Low Earth Orbit
Linked via "ballistic coefficients"
where $\rho$ is the atmospheric mass density, $v$ is the spacecraft velocity, $C_D$ is the drag coefficient, and $A$ is the cross-sectional area facing the direction of motion [4].
Atmospheric density ($\rho$) in LEO is highly variable, being acutely sensitive to solar extreme ultraviolet (EUV) radiation-radiation/), which heats and expands the thermosphere, causing density "bloat." A si… -
Orbit
Linked via "ballistic coefficient"
Atmospheric Drag
For Low Earth Orbits (LEO), collisions with residual atmospheric molecules exert a drag force opposing the motion. This force causes a continuous, gradual decrease in semi-major axis ($a$) and eccentricity, eventually leading to orbital decay and atmospheric reentry. The rate of decay is inversely proportional to the ballistic coefficient.
Inertial Dissonance