Here you can select the time from which the observations will be displayed. The last month will be used by default.
In this case, the search results in the middle of the page will show the findings reported to the Skywarden during the past month.
By clicking on the word 'ends' with the mouse, you will also see the end time of the search period. This is useful in situations where you want to look at observations from a period in the past, such as reports from a particular week in Skywarden.
Especially when looking at observations for a particular time period, you may want to do the search based on when the observed phenomenon actually happened instead of the time when it was sent to the observation database. In that case, you may want to select 'Observed' instead of the default 'Sent'. Please note that the browser uses a cookie to remember your choice of the start time of the search. If you have enabled cookies and do not clear them from your browser's cache, the same browser will display observations from the same time window you last selected the next time you use it.
Please note that the browser uses a cookie to remember your choice of the start time of the search. If you have enabled cookies and do not clear them from your browser's cache, the same browser will display observations from the same time window you last selected the next time you use it.
The "Sent" -option retrieves observations submitted to the Skywarden during the selected time period, regardless of when those phenomena were seen in the sky.
The selection “observed” retrieves the phenomena that appeared in the sky during the selected period, regardless of when they were reported to the Skywarden.
You can choose to show only phenomena of the desired level of visibility in the search results. For example, "at least III" removes the phenomena classified as the weakest (I-II). Similarly, "at least V" removes from the results all but the relatively rare phenomena or those classified as very impressive (V).
Here you can do a free-text search to the observations
The given text will bee searched from observation titles,descriptions, technical details and identified phenomena
You can search for any persons observations by writing the observer's whole name or part of the name here. For example 'John Smith' or 'John S'
You can also performa a search based on asspciation/team name or part of the name, like "Lahden Ursa".The search will bring up observations, that exactly match the given string.
To find observations made in some specific location, type the municipality name to the search field. For example, "Mikkeli"
You can also list multiple locations by separating them with a comma.For example "Mikkeli, Hirvensalmi, Juva, Kangasniemi". In this case, the search will return findings that match the locations listed.
In this field, you can search for more detailed phenomenon identifiers included in the observation details.
Such are, for example, deep space object types such as "spiral galaxy" or "reflection nebula" or halo forms such as "sundog" or "sun pillar".
You can also list multiple types of phenomena by separating them with a comma. A search will bring up findings that match one or more of the terms you listed.
By narrowing down the search date limits and typing, for example, "northern lights", you can see all the northern lights seen within a certain time period.
Copyright © 2018 Pepe Salo. All rights reserved.
Corona (of the sun) is a colored ring or series of rings visible in the immediate vicinity of the light source. It can appear in both clouds and fog.
Coronae are formed in very small drops of water. The size of the droplets affects the size of the corona ring. The smaller the droplets on average, the larger the circle is.
With the water droplets being about the same size as each other, a series of strongly colored corona rings can be seen in the sky. When the droplet size is wide, only one ring with faint colors is visible.
A corona can also be formed by small ice crystals in the upper clouds, but such coronas are very faint.
The corona phenomena identification in Skywatch is intended for different kinds of corona rings that appear around the Sun. The coronae of the moon and planets have their own phenomena identification selections.
Unlike halo rings, which are located apart from the Sun or the Moon, the perimeters form a uniform field of light in the immediate vicinity of the celestial body.
Corona. Image by Ismo Luukkonen.
Corona in the morning mist. Photo by Iida Pennanen.
The distortion of the corona is caused by changing droplet sizes in the cloud. Imabe by Eetu Saarti.
A solar corona on a thick cloud. The lack of colors and suble changes in shades is hinting about wide range of droplets in different sizes. Photo by Marko Riikonen
Feeble vaque corona. Image by Matias Takala.
If the size of the droplets changes drasticly, the corona may appear strongly distorted. Photo by Aki Taavitsainen.
Comments are checked and moderated before publication If you want to contact the observer directly about possibilities to use these images, use the Media -form.
* Real name
Along the years, several foundations have supported the development of this site.
Desktop version of the site
Show the mobile version
Site development by the Skywarden team and E. Bruus.
© 2011- 2022 Ursa Astronomical Association. All rights reserved.