Abstract
A comparison of observations from space and from the ground should be limited to the optical spectral range (about 0.35μ-10μ). Optical observations give, either directly or indirectly, access to:
-
a)
the photosphere and chromosphere where most research is into small-scale dynamical processes, and
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b)
the solar interior by means of seismology, measurement of large-scale velocities, and statistical analysis of long-period data sets.
Instrumentation and observing modes have to comply with the scientific needs. With the aid of a few examples we discuss advantages and disadvantages of observations from space and from the ground.
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a)
Observations with high spatial resolution are limited, principally, by the short time-scales (10s – 100s) of the dynamic phenomena and by photon noise. An observational set (e.g. a time sequence) is thus restricted to few spectral bands and to a small field of view. Criteria for the selection of the instrumentation are: spatial resolution, duration of observation, and versatility of the instrument.
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b)
For “observing” the solar interior one needs velocity measurements of high pre cision (1 m s−1 - 1 cm s−1) and over extended intervals of time (years to centuries) on a routine basis. Selection criteria to decide on space or ground based obser vations are stability and the possibility to monitor the Sun over years.
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Kneer, F. (1987). Observations from space vs. ground based observations: Advantages and disadvantages. In: Schröter, EH., Schüssler, M. (eds) Solar and Stellar Physics. Lecture Notes in Physics, vol 292. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0032317
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DOI: https://doi.org/10.1007/BFb0032317
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