canonical
发表于 2025-3-25 06:15:59
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JECT
发表于 2025-3-25 10:25:01
Book 20031st editiont shows sunspots and other features that displaya wealth of fine detail and change their appearance strikingly from day to day. But observing the Sun can be dangerous. NEVER look at the Sun through a telescope or other optical aid, even for a brief instant. The Sun‘s intense radiation, amplified and
争论
发表于 2025-3-25 13:41:22
Measuring Solar Activity, by professional observatories, but counting is the only one that is practical for the amateur. Sunspot counts are very useful in monitoring the Sun’s behaviour and one type of sunspot count, known as the Relative Sunspot Number, is an internationally recognised measurement of sunspot activity.
羽毛长成
发表于 2025-3-25 16:56:55
Solar Photography,ras well within the amateur astronomer’s budget and prices are dropping all the time. At the time of writing (late 2001), some entry-level models were selling for £100 or less and many cameras capable of taking really good solar images were available for under £500.
经典
发表于 2025-3-25 23:34:04
What We Can See on the Sun, atmospheric factors are a nuisance to the amateur solar observer and are the main reason why professional astronomers site their solar observatories on the tops of high mountains or on spacecraft. However, with a little planning and thought about the causes of these problems the amateur can sometimes get round them to some extent.
bifurcate
发表于 2025-3-26 02:51:10
1431-9756 n for Chris Kitchin‘s Solar Observing TechniquesThe Sun is the brightest and most accessible object in the sky, and it has much to offer the amateur astronom er with modest equipment. On most days it shows sunspots and other features that displaya wealth of fine detail and change their appearance st
BALE
发表于 2025-3-26 05:10:00
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apropos
发表于 2025-3-26 12:01:48
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躲债
发表于 2025-3-26 14:01:36
Lee Macdonalderees for their helpful advice in making the volume a reflection of the dynamic interchange that characterized the workshop. The success of the Seminar was due 978-3-0348-9677-1978-3-0348-8555-3Series ISSN 1050-6977 Series E-ISSN 2297-0428
BOON
发表于 2025-3-26 18:56:56
Lee Macdonalderees for their helpful advice in making the volume a reflection of the dynamic interchange that characterized the workshop. The success of the Seminar was due 978-3-0348-9677-1978-3-0348-8555-3Series ISSN 1050-6977 Series E-ISSN 2297-0428