Keywords: mrtcal-check

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# Calibration stability with time and elevation

Figure 12: Integrated line intensity in MIRA (black) and MRTCAL (blue) spectra for the two brightest lines in the E230 setup versus time (top panel), and for the strongest line versus elevation (bottom panel), after correction for the gain-elevation-curve. One data point is shown per scan; the observing sequence consisted of one calibration scan and two science scans of 6min length.

Figure 12 shows the integrated line intensity of the strongest lines in the E230 setup as a function of the observation time or the source elevation. The intensities were corrected for the gain-elevation-curve (Peñalver 2012). The correction amounts to about 15% for the lowest elevations of 25.

The line intensities are relatively stable except between 44 and 54 where the intensities appear low compared to the remaining points. This also corresponds to an observing time interval (8.5-9.25UT) between two pointing observations. An error in the pointing correction could explain this difference.

Next: Acknowledgments Up: mrtcal-check Previous: Comparison of switching modes Contents