SQM vs. NELM – preliminary results

I started making regular observations of NELM and SQM in late March last year when I bought a SQM-L device for myself. Then I started a project about collecting these measurements and comparing NELM vs. SQM. Here’s a preliminary graphical presentation of my results. In this graph, there is SQM plotted vs. NELM. This dataset is a compilation of 31 measurements. I also fitted a trend line in the data, and produced an equation for the line which is like this:


This work will be going on and I will be collecting more data to make more solid basis for making conclusions. I have been using Open office Calc to produce this graph and trend line.

NELM vs. SQM measurements

Keep on looking for more posts! I’m not done yet!


Observing in cold weather

Last night the sky was clear and I decided to make some routine observations. I set my scope up in the yard of my apartment in Sodankylä and I had a look  at Jupiter and the crescent Moon in the western sky – and it was absolutely wonderful sight!

Moon and Venus had been in a beautiful conjunction during couple of days and they were close to each other also this night. Unfortunately I don’t have so good camera that I could take decent photos of these celestial events now.

The sky was relatively dark, because there were no aurorae glowing and flaming in the sky this time. Only light pollution, Moon and light reflected from the sky were diminishing the darkness of the sky. It was also very cold this time, temperature was about -20 °C.

This time I observed Z And and R Tri. The brightness of Z and was about 9.1, which has been a very typical to it during the time that I have been observing the star. I observed this star first time in late july last year and it’s brightness has been almost constantly ~9 magnitudes. Whereas the other star of this session – R Tri had been getting fainter and fainter. Now the star has dropped into it’s minimum – a fact that I checked from the AAVSO website. When I observed this star last time about two months ago, it’s brightness was peaking in it’s maximum around 6 magnitudes. Now it’s brightness had dropped to ~11 magnitudes.

Observing session: #27/11-12
Date: 27/28.1.2012
Time: 19.10-20.20
Place: Sodankylä, Finland
Instruments used: L102/1000 mm
Objects observed: Z And, R Tri
Conditions: NELM: 5.6, SQM: 19.20, -20 °C, clear sky, calm, no aurorae, 20% Moon in west at altitude of 15°

First observing session this year!

Couple of days ago the sky got finally clear after long cloudy period! But it was also very cold, about -20 °C! At the beginning of my observing session, conditions were OK and there wasn’t any aurorae. But then, about 19.30 northern lights started to flame around the sky! The show was going on up to ~21.30. During that time, flaming aurora bands very dominating the show. The activity of the bands was a bit variable, first they got fainter but then again brighter and more active! During the active bursts, there was also beautiful rays in the belts and they were moving wery quickly! It was absolutely amazing! I also observed Z Uma, whose brightness was about 7.8 magnitudes.

Observing session: #26/11-12
Date: 24/25.1.2012
Time: 18.30-21.30
Place: Sodankylä, Finland
Instruments used: L102/1000 mm
Objects observed: Z Uma
Conditions: NELM: 5.3, SQM: 18.77, -20 °C, mostly clear sky, calm, no Moon, aurorae between ~19.30-21.30, about 50 cm snow on the ground

Solar statistics 2011

Hello you all, and wonderful and the most succesfull new year!

Year has changed, but the weather hasn’t changed much. It has been continuously cloudy here in Finland, and I haven’t got any observing chances this year – yet.

Nevertheless, I made some summary and statistics of last year’s Solar observations.

Briefly, it looks like this:

  • Amount of observations: 79
  • Amount of observing months: 5
  • average of R: 43.96
  • average of NAE: 0.12
Monthly averages of R and NAE in year 2011

So there has been some activity in the Sun! The most active month was July, when the monthly average of R peaked in 51.05! The highest monthly average of NAE was recorded in August, when it was 0.6.

For complete statistics, please have look at here!