Arresting
发表于 2025-3-25 05:30:56
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stress-response
发表于 2025-3-25 08:20:37
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grovel
发表于 2025-3-25 11:51:36
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反复无常
发表于 2025-3-25 16:42:08
The Sun and Its Atmosphere,ment. The internationally recommended minimum safe protection level across the visible spectrum for extended exposure is ND3 (Neutral density #3). All the commercial white light solar filters available to the amateur comply with this guideline.
污秽
发表于 2025-3-25 22:09:50
Solar Observations Using Spectroscopes,um. Newton’s early experimentation with prisms incorrectly led him to conclude that a glass lens would always present this spectrum of light as a chromatic aberration and was therefore of limited value to astronomical telescopes. If nothing else, this encouraged him to work on reflective optics and
遭受
发表于 2025-3-26 00:09:41
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adj忧郁的
发表于 2025-3-26 08:02:14
SHG Images and Science Achievements,apter. In this chapter we show some of the exciting images and science which can only be achieved with the SHG at different wavelengths and bandwidths. One of the strengths of the SHG is that we can accurately position the acquisition bandwidth at a nominated wavelength and known distances (in Å) fr
–scent
发表于 2025-3-26 11:59:04
The Spectrohelioscope (SHS), (SHS) as discussed in Chap. .. In this chapter we will briefly review the current status of the visual SHS as implemented by amateurs. It’s fair to say that the complexity of the SHS, and the large focal lengths required to obtain acceptable visual results has worked against the ongoing development
整洁
发表于 2025-3-26 15:59:36
Future Solar Imaging Developments,e a highly capable, cost effective and a safe environment for basic solar imaging. Future improvements will probably not come from the filter technology but from the use of the next generation of fast-frame cameras. These cameras have the potential to record added high resolution detail to sunspot i
爱好
发表于 2025-3-26 17:42:01
The Spectrohelioscope (SHS), of the SHS. Fred Veio’s construction notes for the SHS over the past 30 years have not substantially changed; the basic design philosophy and implementation of the early constructors still being used today.