Abstract
AbstractWe review the use of Stark effect to measure d.c. and wave-related electric fields predicted in models of coronal and flare heating, prominence support, and related phenomena. We describe the Mk II limb electrograph now in routine operation at NSO/Sac Peak, using high Paschen series lines around 8500 Å, and its testing (using the Zeeman effect) as a transverse magnetograph, on penumbral magnetic fields. We summarize our new upper limits on the d.c. fields in quiescent prominences and of the Alfvén wave flux in the corona, and a possible detection of 15 – 20 V cm−1electric fields in a bright surge at the limb. We also outline our ongoing observations at Brackettγ(2.16μ) and our plans to observe in the very sensitive 15-9 transition of H I at 11.539μ.
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