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Where is the best possibility to see auroras in Finland?
The Map on the right side shows statistically defined probabilities of seeing auroras in Finland. Probabilities are defined from Finnish Meteorological Institute All-Sky camera chain during several decades.
Some of the major cities are marked on the map, and also Killpisjärvi, which is a small village of about 200 residents, but which has been, and still is, a very important site for auroral research. It is located near the area where auroras occur, auroral oval.
What we can find from the map, is that the probability to see auroras is highest in Kilpisjärvi (75 %). Probability decreases so that in Rovaniemi area probability is roughly 45 %, in Oulu area about 30 % and in Helsinki area only 5 %.
"So closer you go to North-West part of Finland, more likely you will see auroras."
Een andere interessante vraag:
When is the best possibility to see auroras?
Time of the year: Auroras are visible in northern Finland from beginning of September to middle of April. Auroras occur also during summertime, but the night are too light during that period and you can't see auroras at all. Nights in southern Finland are more dark so the period is longer, but at the same time the probability to see auroras so far south is much smaller.
Time of the day: In normal case auroras occur in Finland sector between 21 - 01 in evening, with the maximum around 22 - 23. However, during geomagnetically active times (read: lots of variations and disturbances in near-Earth space which also cause auroras) auroras can be visible during the whole night from 18 - 06.
Changes in auroral activity: Certain cycles can be found from auroral activity. Most important of these are 11-year cycle, 27 day cycle and annual variations.
Suns activity, which is also the main reason of auroras, varies in 11-year cycle. Activity deceases from maximum to minimum in roughly 6 year, and returns to maximum in 5 years. During the maximums auroras are more probable, and during the minimums auroras occur less. This effect especially lot to big auroral storms, when auroras can be seen far south; these are much more probable during suns activity maximum. Currently (November 2000) we are living in middle on maximum time.
The 27 day cycle is caused by Suns rotation. Equatorial region of the Sun rotates around once in 27 days, so if some specific region causes strong auroras, it is possible that it causes auroras again after 27 days.
An annual variation can also be found: Auroras are more probable during autumn and spring equinoxes than during winter solstice. So in that sense, October and March might be good months to go to north.
Ik ga er dus vanuit dat ik tijdens mijn 8 dagen durend verblijf zeker en vast het poollicht kan aanschouwen
Kuusamo (waar ik heen ga) ligt nog zo'n 200km noordelijker dan Oulu, de plaats waar deze fotograaf woont. De kans bedraagt er ongveer 40%.
Groetjes, Ruben
Met commentaar:
Where is the best possibility to see auroras in Finland?
The Map on the right side shows statistically defined probabilities of seeing auroras in Finland. Probabilities are defined from Finnish Meteorological Institute All-Sky camera chain during several decades.
Some of the major cities are marked on the map, and also Killpisjärvi, which is a small village of about 200 residents, but which has been, and still is, a very important site for auroral research. It is located near the area where auroras occur, auroral oval.
What we can find from the map, is that the probability to see auroras is highest in Kilpisjärvi (75 %). Probability decreases so that in Rovaniemi area probability is roughly 45 %, in Oulu area about 30 % and in Helsinki area only 5 %.
"So closer you go to North-West part of Finland, more likely you will see auroras."
Een andere interessante vraag:
When is the best possibility to see auroras?
Time of the year: Auroras are visible in northern Finland from beginning of September to middle of April. Auroras occur also during summertime, but the night are too light during that period and you can't see auroras at all. Nights in southern Finland are more dark so the period is longer, but at the same time the probability to see auroras so far south is much smaller.
Time of the day: In normal case auroras occur in Finland sector between 21 - 01 in evening, with the maximum around 22 - 23. However, during geomagnetically active times (read: lots of variations and disturbances in near-Earth space which also cause auroras) auroras can be visible during the whole night from 18 - 06.
Changes in auroral activity: Certain cycles can be found from auroral activity. Most important of these are 11-year cycle, 27 day cycle and annual variations.
Suns activity, which is also the main reason of auroras, varies in 11-year cycle. Activity deceases from maximum to minimum in roughly 6 year, and returns to maximum in 5 years. During the maximums auroras are more probable, and during the minimums auroras occur less. This effect especially lot to big auroral storms, when auroras can be seen far south; these are much more probable during suns activity maximum. Currently (November 2000) we are living in middle on maximum time.
The 27 day cycle is caused by Suns rotation. Equatorial region of the Sun rotates around once in 27 days, so if some specific region causes strong auroras, it is possible that it causes auroras again after 27 days.
An annual variation can also be found: Auroras are more probable during autumn and spring equinoxes than during winter solstice. So in that sense, October and March might be good months to go to north.
Ik ga er dus vanuit dat ik tijdens mijn 8 dagen durend verblijf zeker en vast het poollicht kan aanschouwen
Kuusamo (waar ik heen ga) ligt nog zo'n 200km noordelijker dan Oulu, de plaats waar deze fotograaf woont. De kans bedraagt er ongveer 40%.
Groetjes, Ruben