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Surprisingly few solar coronal loops have been observed simultaneously withTRACE and SOHO/CDS, and even fewer analyses of these loops have been conductedand published. The SOHO Joint Observing Program 146 was designed in part toprovide the simultaneous observations required for in-depth temperatureanalysis of active region loops and determine whether these loops areisothermal or multithermal. The data analyzed in this paper were taken on 2003January 17 of AR 10250. We used TRACE filter ratios, emission measure loci, andtwo methods of differential emission measure analysis to examine thetemperature structure of three different loops. TRACE and CDS observationsagree that Loop 1 is isothermal with Log T $=$ 5.85, both along the line ofsight as well as along the length of the loop leg that is visible in the CDSfield of view. Loop 2 is hotter than Loop 1. It is multithermal along the lineof sight, with significant emission between 6.2 $<$ Log T $<$ 6.4, but the loopapex region is out of the CDS field of view so it is not possible to determinethe temperature distribution as a function of loop height. Loop 3 also appearsto be multithermal, but a blended loop that is just barely resolved with CDSmay be adding cool emission to the Loop 3 intensities and complicating ourresults. So, are coronal loops isothermal or multithermal? The answer appearsto be yes!

Are Coronal Loops Isothermal or Multithermal? Yes!