Table 1: Transition region observing instruments (100-200 nm).
Instrumentsa Type Wavelength ${\Delta \lambda}$ ${\Delta x}$ Science FOV Status
    [nm] [pm] [arcsec]   [arcsec]  
Sounding rockets              
SUMI Spectrograph 155 & 280 2 & 5 1 Magnetography 180 Under
              Construction
HRTS Spectrograph 120-170 5 1 Line profiles 1000 Flown
VAULT Spectrograph 120-120 7 0.3 Line profiles 3600 Flown
MSSTA Imager 155+14$\lambda $'s 10 nm 1 Multiple $\lambda $'s 2000 Flown
Orbiting missions              
SUMER Spectrograph 39-161 4-8 1.5 Line profiles 300 On orbit
UVCS Spectrograph 49-150 9-14 7 Coronal lines 300 On orbit
TRACE Imager 155, 160, 170 + 4$\lambda $'s 3.7 nm 1 Multiple $\lambda $'s 510 On orbit
AIA Imager 160, 170 + 8$\lambda $'s 20 nm 1 Multiple $\lambda $'s 2460 Under
              Construction
Notation: SUMI= Solar Ultraviolet Magnetograph Instrument (MSFC); HRTS=High Resolution Spectrograph (NRL); VAULT=Very high Angular resolution Ultraviolet Telescope (NRL); MSSTA=Multi-Spectral Solar Telescope Array(Stanford); SUMER=Solar Ultraviolet Measurements of Emitted Radiation (SOHO/Lindau); UVCS=Ultraviolet Coronal Spectrometer (SOHO/CfA); TRACE=Transition Region and Coronal Explorer (SMEX/LMSAL); AIA=Atmospheric Imaging Assembly (SDO/LMSAL); $\Delta\lambda =$ spectral resolution, $\Delta x =$ spatial resolution.

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