Per the information above and the diagram below, the K2 portion of the CaK emission extends to the height of the H alpha core emission above the photosphere - thus the similarity to the "double limb" seen in H alpha filters with bandpasses over 0. I believe that the layer imaged above is that of the higher K2 and possibly K3 portions of the CaK emission line, which while apparently faint, can be brought out with the right processing. Therefore the CaK line is actually composed of three differing layer heights. See Mihalas' book _Stellar Atmospheres_ pg. Km above that, and K3 from higher in the chromosphere. K1 comes from near the temperature minimum, K2 from around1000 ![]() These portions of the line arise at different heights in the upper photosphereĪnd chromosphere. Note that in high resolution spectra the whole line (or parts of it) can beĭoppler shifted and thus vary in appearance depending on what's happening at that location on K3 = the dip at the very center of the line. There are two points, K2RĪnd K2V again on each side of the center of the line. K2 = the point of maximum brightness in the reversal. Points, called K1R and K1V on each side of the center of the line. K1 = the point in the line wings where the reversal starts. The Ca II K line is one of the most useful lines in the solar spectrum, but it is one of the most complicated lines in terms of its formation. The Luxi iPhone/iPad light meter attachment has a suggested retail price of 19.99. The line arises from a transition between the 4p 2P 5/2 state to the 4s 2S 1/2 state (really need sub- and superscripts to write these correctly) of singly ionized calcium (Ca II). The very core of the line reverses again - there is a dip in brightness again. Cine Meter II costs 19.99 and is now available on the App Store. See the Cine Meter II webpage for more details. The K line is very dark and wide, but at the center of it is an unusual "brightness reversal" - the center of the line gets brighter. Add a Luxi photosphere for incident-light readings ( 30 from ESDevices for iPhone 4/4S or 5/5S support for other devices coming soon). The K1, K2 and K3 refer to specific parts of the line. The line at 3933 angstroms is called K because that's what Fraunhofer called it. “You can download the CaK absorption line spectra online to see the K1, K2, and K3 parts of the line. ![]() It's just like one of those fancy old-school light meters, but at a far better price. When paired with the free Luxi app, Luxi For All will help you determine the best settings for your DSLR or other camera, so you can take perfectly exposed pictures. Features do not seem to change as much as they do with H alpha DSing.īob - I got this from John Varsik at BBSO some time ago, and hopefully may provide some insight on what you observed. Luxi For All is a diffusion dome attachment for your iOS device's front-facing camera. Lastolite EzyBalance Gray Card (Foldable) Sekonic L-308S-U (Typical basic incident light meter - Minolta is not longer in business but sold to Sony who does not make light meters) Sekonic Speedmaster L-858D-U Light. ![]() Cinemeter II App (25 - iOS only) iOS/Apple. Harald Paleske has double stacked two Lunt CaK modules. Luxi for All Incident Meter Dome for smartphones: Luxi App (Free) iOS/Apple.
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