Upper Level Lows and Six Meter 50 Mhz Es: A Citizen Science Investigation
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1 K1YOW Upper Level Lows and Six Meter 50 Mhz Es: A Citizen Science Investigation Joseph A. Dzekevich, K1YOW@ARRL.NET Presented by Phil Erickson, W1PJE@ARRL.NET
2 Outline I. Introduction II. What Started This Investigation? III. Sporadic E (Es) IV.Es and 6M Low Pressure Observations using Amateur Radio V. Conclusions
3 K1YOW Joe Dzekevich, FN42, Harvard, MA, USA Retired Reliability Engineering Fellow Licensed in 1962 Station is modest: TS-950SG or IC-746- PRO, 100W, into a 7 band OCF dipole Interests: Propagation (Es, F2, Geomagnetic Storms, PCA, Tropo Ducts, Gray Line, Auroras), Astronomy, Science Used CRPL Predictions way back in the 60 s. K1YOW@ARRL.NET K1YOW
4 W1PJE Dr. Philip J. Erickson, FN42, Westford, MA, USA Assistant Director, MIT Haystack Observatory Ionospheric / Radio Scientist (Licensed 2016) Nashoba Valley Amateur Radio Club (NVARC) Forging links between radio amateurs and professional ionospheric researchers W1PJE@ARRL.NET
5
6 What Started This Investigation? Typical 6M Day for the Spring of 2016 European 6M Es, NA Nothing! What then are the causes of Es?
7 Sporadic E (Es) Sporadic E layers are phenomena of the ionospheric E region. The Es layers appear mainly at daytime in mid latitudes in the summer hemisphere. Sporadic E layers = enhanced electron density compared to the background ionization. They occur between 90 and 120 km altitude with a thickness of usually km and a horizontal extent of km. Neutrals Ions/Electrons (radio wave propagation effects) Ions/Electrons
8 Sporadic E: Related to Neutral Wind Neutral winds at 100 km altitude can have strong shears Meteoric dust input (Fe+, Mg+, K+): winds can pile up ions into thin layers Electrons follow = sporadic E: source of skip Depends critically on neutral wind patterns (variable) SpE most often seen in summer Haldoupis, 2011
9 Global Es: Red/Yellow = Es Areas
10 North America is Not an Es Hot Spot!
11 What Else is Going On? If then North America is not an Es hot spot, then why do we see good Es at times? Amateurs over the years have also noticed that Es openings seem to happen near upper level TROPOSPHERIC (neutral atmosphere) disturbances, as well as the regular Es openings.
12 K1YOW s Hypothesis The hypothesis to be tested is: besides the normal random Es, Es openings are enhanced by strong neutral atmospheric disturbances like hurricanes and upper level low pressure systems at mid latitudes. Cause: lower atmosphere low pressure systems may be affecting upper level tidal wind shear. Upper atmosphere wind shears: active research area in the professional community. Can we see this effect using Amateur Radio?
13 June Two Upper Level Lows during 50 Mhz Trans-Atlantic Es Double Hop Note: Views are surface level winds just to make things easier to see. Viewing high level winds make things very hard to see what is going on.
14 June 13, 2016 Two Atlantic Storms Upper Low 1 Upper Low 2
15 June 13, Meter Double Hop Trans Atlantic Es DX Map The VHF Gods Were Smiling on us this Day!
16 June 13, 2016 Another View Upper Low 1 Europe New England Sporadic E has formed where these two storms are, thus enabling trans Atlantic 6M contacts because they are within reach of each other and the coasts. Upper Low 2
17 K1YOW on 6M in FN42 worked: EA7AH in IM67 on CW G4RRA in IO80 on CW EI4DQ in IO51 on CW One day earlier (VHF contest) I worked 35 stations in 2.5 hours in the 1,2,3,4,5,7,8,9 and 0 call districts on 6M. I did not call a single CQ. All using 100W and a 7 band Buckmaster OCF horizontal dipole strung in some white pines 1.5 stories up. So: We small guns do have a chance under good conditions (W1PJE: other examples exist but omitted here for time)
18 Happening again in /17/ :32 GMT 6M Vortex and Es in Same General Area
19 K1YOW Ham Radio Citizen Science Conclusions Es is not random just many variables still cant predict it yet! Upper level low pressure systems are likely affecting high level tidal wind shears, forming Es via T-Storms, Hurricanes, Strong Fronts. It is looking like we can use Amateur Radio to see and document these occurrences. North America is not the best Es spot in the world. Hams should not pray for hurricanes and storms just so they can work 6M DX!!!
20 Still In Mourning
21 Reference Links pdf A statistical analysis on the relationship between thunderstorms and Sporadic E Layer over Rome V. BartaP1,2P, UC. ScottoUP3P, M. PietrellaUP3P, V. Sgrigna P4, G. SátoriP2P, L. Conti 5 F-Region Propagation and the Equatorial Ionospheric Anaomaly, Jim Kennedy, K6MIO/KH6, QEX Issue No. 299 November/December 2016
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