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The C II] feature at ~2325 Angstrom is very prominent in the spectra of TTauri stars (TTSs). This feature is a quintuplet of semiforbidden transitionsexcited at electron temperatures around 10,000 K that, together with the nearbySi II] and Fe II] features, provides a reliable optically thin tracer foraccurate measurement of the plasma properties in the magnetospheres of TTSs.The spectra of 20 (out of 27) TTSs observed with the Space Telescope ImagingSpectrograph (STIS) on board the Hubble Space Telescope (HST) have good enoughsignal to noise ratio (S/N) at the C II] wavelength. For these stars we havedetermined electron densities (ne) and temperatures (Te) in the line emissionregion as well as the profile broadening (sigma). For most of the stars in thesample (17) we obtain 10^{4.1} < Te < 10^{4.5} K and 10^{8} < ne < 10^{12}cm^{-3}. These stars have suprathermal line broadening (35 < sigma < 165 kms^{-1}), except TW Hya and CY Tau with thermal line broadening. Both C II] lineluminosity and broadening are found to correlate with the accretion rate. Lineemission seems to be produced in the magnetospheric accretion flow, close tothe disk. There are three exceptions: DG Tau, RY Tau and FU Ori. The linecentroids are blueshifted indicating that the line emission in these threestars is dominated by the outflow.

Constraints to the magnetospheric properties of T Tauri stars. I. The C II], Fe II] and Si II] ultraviolet features