Thursday, 4 May 2017

Servers working again / Palvelimet toimivat taas

For your information /

In English

Our servers (www, DNS, e-mail) are up and running again, and we are back to normal. However, there's a risk that e-mails sent to us between 3rd May, 10:00 and 4th May, 10:00 (both local time), have not reached us. If you want to make sure, please resend your messages. We apologise for the inconvenience.

Suomeksi

Meidän palvelimet (www, DNS, s-posti) toimivat taas ja tilanne on normalisoitu. Mutta on mahdollista, että s-postit lähetetty @sgo.fi osoitteisiin 3.5. klo 10 ja 4.5. klo 10 välisenä aikana eivät tulleet perille. S-postit tästä aikavälistä kannattaa lähettää uudelleen varmuuden vuoksi. Pahoittelemme tilannetta.

Wednesday, 3 May 2017

Server failure at SGO / Palvelinongelmia SGO:ssa

For your information / Tiedoksenne


In English:

Today both our web server (www.sgo.fi) and our mail server (@sgo.fi addresses) failed, and our technical team are doing their best to get them up and running as soon as possible. But it still might take a while. We are sorry for the inconvenience!

In the meantime you can use addresses of the University of Oulu in the form firstname.lastname@oulu.fi.

Please use our old web server oldwww.sgo.fi for the time being, while outdated otherwise, it will at least provide the up-to-date measurements.


Suomeksi:

Tänään sekä webbi- (www.sgo.fi) että sähköpostipalvelimessamme (@sgo.fi osoitteet) on tapahtunut järjestelmävika. Meidän teknisellä tiimillä on asia hoidossa ja he yrittävät saada kaikki toimimaan pian. Silti tämä kestää jonkin aikaa. Pahoittelemme tilannetta!

Väliaikaisesti voi lähettää sähköpostia Oulun yliopiston osoitteet etunimi.sukunimi@oulu.fi -muodossa.

Väliaikaisesti meidän vanha webbipalvelin oldwww.sgo.fi on taas käytössä. Palvelimesta ainakin saadaan nykyiset mittausdatat vaikka se on muuten vanhentunut.

Tuesday, 11 April 2017

EISCAT Radar Time Available: Call for Proposals

Tromsø VHF Radar seen from the top platform of the UHF Radar; Sep. 2017.
The EISCAT Scientific Association invites applications for observing time on the EISCAT facilities in 2017, by individual scientists, research groups, and consortia throughout the world on equal, competitive basis. This means that anyone can apply, independent of whether or not the applicant is from an EISCAT associate country.

While evaluations are merit based, in the case of two applications having similar merits in evaluation, preference will be given either to those applicants who are new to the EISCAT facilities, in order to enlarge the EISCAT user community and further more open access to the facilities, or to the applicant showing stronger educational impact in their proposal.

The present call is the second one for 2017. In total, 200 hours of experiment time are open for international, peer-reviewed competition, and are available for the use of any of the current EISCAT facilities. Roughly half of this time has been allocated in the first call.

Please refer to the details of the call at https://www.eiscat.se/blog/2017/04/10/eiscat-peer-reviewed-program-experiments-2/ for more information.

The deadline for proposals is 1st May 2017 at 24:00 UTC.

Text: EISCAT. Photo: Th.Ulich.

Tuesday, 7 February 2017

Northern Lights 31st January / 1st February 2017

[Helsingin Sanomissa 7.2.2017: "Revontulet sykkivät mystisesti" -artikkeli SGO:n ja Japanilaistutkijoiden välisestä tutkimusyhteistyöstä.]

Last week beautiful northern lights were seen across large parts of Northern Finland and Scandinavia. Already early in the evening after 19:00 EET (17:00 UTC), the lights appeared and by 21:00 EET the sky was filled with what we call "pulsating aurora". This form of aurora displays large patches of diffuse green light, which are flickering at various speeds, some flicker very fast. Pulsating aurora is very much a topic of active research, and our Japanese colleagues just launched the ARASE (ERG) satellite to study these specific lights from space. These efforts are combined with optical studies on the ground, and just in time for last week's northern lights, a special high-speed camera was installed at SGO, which can take up to 100 photos of the aurora per second!

From Sodankylä, four films of the aurora during the night of 31st January / 1st February have recently been published, two of which are from SGO:

The video above was made by taking all of the images of the regular all-sky camera of SGO, which are black-and-white images taken through filters for the auroral green, red, and blue lines, and combine these to create RGB (false) colour images. Images are taken every 20 seconds, and thus the video linked above is a time-lapse of the whole night, which is just 1min 30 sec long. (©2017 by SGO)

The video linked here is a result of a collaboration between SGO and Site-Eye Ltd., UK. Site-Eye have installed two long-term time-lapse cameras at SGO, one looking at the sky at a northerly direction, the other looking west across the river Kitinen. This video combines images from both cameras. (©2017 by SGO and Site-Eye Ltd)

The video above was taken by SGO's Thomas Ulich, who placed a camera looking almost straight up, with a slight tilt towards the south. This is the best direction to see what is called the auroral corona, a display, where the auroral rays all seem to originate from the same point in space. This is, however, just a result of perspective: the rays are in fact parallel. Images taken over 9 hours at a rate of four photos per minute were combined into a time-lapse film of about one minute duration. (©2017 by Thomas Ulich, see his blog post)

In the final video of this series, which was taken by SGO's Esa Turunen using a fish-eye lens to cover as much sky as possible, you can see the shapes of pulsating aurora especially well. They are patches drifting across the sky and flickering at the same time. The images were taken at a rate of approximately one per second. (©2017 by Esa Turunen)

Please note that in all videos linked here, the flickering of the aurora is aliased by the number of time per minute the images were taken as well as by the frames-per-second rate of the final time-lapse films.