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Scattered sunlight from the interplanetary dust (IPD) cloud in our Solarsystem presents a serious foreground challenge for spectro-photometricmeasurements of the Extragalactic Background Light (EBL). In this work, wereport on measurements of the absolute intensity of the Zodiacal Light (ZL)using the novel technique of Fraunhofer line spectroscopy on the deepest 8542Angstrom line of the near-infrared CaII absorption triplet. The measurementsare performed with the Narrow Band Spectrometer (NBS) aboard the CosmicInfrared Background Experiment (CIBER) sounding rocket instrument. We use theNBS data to test the accuracy of two ZL models widely cited in the literature;the Kelsall and Wright models, which have been used in foreground removalanalyses that produce high and low EBL results respectively. We find a meanreduced chi squared of 3.5 for the Kelsall model and a chi squared of 2.0 forthe Wright model. The best description of our data is provided by a simplemodification to the Kelsall model which includes a free ZL offset parameter.This adjusted model describes the data with a reduced chi squared of 1.5 andyields an inferred offset amplitude of 46 +- 19 nW m^-2 sr^-1 extrapolated to12500 Angstroms. These measurements elude to the potential existence of a dustcloud component in the inner Solar system whose intensity does not stronglymodulate with the Earth's motion around the Sun.

Measurements of the Zodiacal Light Absolute Intensity through Fraunhofer Absorption Line Spectroscopy with CIBER