Post by johnm on Jun 17, 2017 18:54:42 GMT
SpaceWeather.com is repoting a late start to the 2017 NLC season as evidenced by the lack of images submitted. They are reporting that this is due to 'A Mesospheric Heat Wave' resulting in the temperature not being low enough for NLC to form.
The SpaceWeather.com page is at link this has a reference to a more detailed page at link. This has a more detailed plot of the temperature v time, the red 2017 line showing how the temperature is higher this year than in previous years. This is compiled from data from the 'temperature data from the Microwave Limb Sounder onboard NASA’s Aura satellite'.
It is interesting to compare this with the data at link where the trend is not so obvious - if it is visible. Note this data is from above the UK. The data reported in Spaceweather.com is from 80N & 83km with no longitude specified while the data on the second link is furthur south at 50 to 60 degrees North and a longitude of 8W to 2E.
I note that some images of NLC from the UK have been published including on the spaceweather.com page above but I have not made any definite sightings yet.
Regards
John Murrell
The SpaceWeather.com page is at link this has a reference to a more detailed page at link. This has a more detailed plot of the temperature v time, the red 2017 line showing how the temperature is higher this year than in previous years. This is compiled from data from the 'temperature data from the Microwave Limb Sounder onboard NASA’s Aura satellite'.
It is interesting to compare this with the data at link where the trend is not so obvious - if it is visible. Note this data is from above the UK. The data reported in Spaceweather.com is from 80N & 83km with no longitude specified while the data on the second link is furthur south at 50 to 60 degrees North and a longitude of 8W to 2E.
I note that some images of NLC from the UK have been published including on the spaceweather.com page above but I have not made any definite sightings yet.
Regards
John Murrell