- Leif
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- Leif – The Education Finance Platform
Leif partners with schools to provide payment solutions and aligned financing that help students unlock their future
- Eightyeight year periodicity in solarterrestrial phenomena confirmed
The post-1720 11-year sunspotnumber cycleshad relatively small amplitudesat the beginningof the 19th and of the 20th centuries, and these small amplitude cycleshave been widely interpreted as being due to minimums in an 87-year periodic variation Sonerr[1982] has recently run a maximum entropy power spectrumon thesedata and, as expected,found a line at
- iSeries 400 eBook - Leif
Alternatively, you can send payment (credit card OK) to "leif@leif org" using Paypal Paypal now accepts international payments The password is valid for all chapters Because of the prepayment, I'll answer emails about the code examples and help with your own code
- Leif Svalgaard
In principle [and with future refinement of the data acquisition] we should be able to determine polar field reversals using 10Be The data is not quite good enough yet Leif, 7 26 2012 Steinhilber et al 2012
- Long-term variation of solar activity? - svalgaard. leif. org
L Svalgaard 3 HEPL, Stanford University, Cypress Hall C3, 466 Via Ortega, Stanford, CA 94305, USA 4 e-mail: leif@leif org 5 Received November 4, 2013 Accepted Jxxxxxx dd, 2014 6
- M17 (Swan nebula) - svalgaard. leif. org
Conditions: aquired in Barraba, a small town in New South Wales, Australia; no moon, passing haze and clouds Setup: Borg 100ED F6 4, DF-2 focusser, CFW-8, L (IR reject)+R+G+B filters, ST10XE, Takahashi EM-10 mount (here's a picture of this setup) Exposure time: L (1x1 binning): 8x200 sec and 4x4 sec; R,G,B (2x2 binning): 6x60 sec, 12x60 sec, 5x60 sec (few R,B exposures due to clouds
- The History of the Sunspot Number - Leif
Finally, in the 21st century the titanic four-meter-diameter solar telescope DKIST is nearing completion and will enable new observation of solar magnetism at the very finest scales Leif Svalgaard, Stanford University, Boulder, June 2016
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