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  • ARLP031 Propagation de K7RA

    From CX2SA@21:5/101 to PROP on Fri Aug 2 17:10:07 2019
    R:190802/2000Z 10514@N7HPX.#BOI.ID.USA.NOAM BPQ6.0.18
    R:190802/1944Z 34419@N3HYM.MD.USA.NOAM BPQ6.0.18
    R:190802/1947Z @:CX2SA.SAL.URY.SOAM #:11303 [Salto] FBB7.00e $:ARLP031

    From: CX2SA@CX2SA.SAL.URY.SOAM
    To : PROP@ARL


    ZCZC AP31
    QST de W1AW
    Propagation Forecast Bulletin 31 ARLP031
    From Tad Cook, K7RA
    Seattle, WA August 2, 2019
    To all radio amateurs

    SB PROP ARL ARLP031
    ARLP031 Propagation de K7RA

    No sunspots were observed over the past week, and solar flux remains
    flat, with average daily values declining from 67.3 to 67.

    Average daily planetary A index went from 5.3 to 5, and middle
    latitude A index from 6.3 to 5.9.

    Predicted solar flux for the next 45 days remains at 67, August 2
    through September 15, every day.

    Predicted planetary A index is 5 on August 2 and 3, then 8, 18, 15,
    12 and 8 on August 4 to 8, 5 on August 9 to 16, 8 on August 17 and
    18, 5 on August 19 to 26, then 8, 16, 8, 5, 8, 22 and 16 on August
    27 through September 2, 5 on September 3 to 12, 8 on September 13
    and 14, and 5 on August 15.

    Geomagnetic activity forecast for the period August 2 to 28, 2019
    from F. K. Janda, OK1HH.

    "Geomagnetic field will be:
    Quiet on August 2 and 3, 8, 12 to 15, 21 and 22
    Quiet to unsettled on August 9, 16 and 17, 23, 25
    Quiet to active on August 4 and 5, 7, (10 and 11,) 19 and 20, 24, 28
    Unsettled to active on August 6, (18, 26 and 27)
    Active to disturbed-None!

    Solar wind will intensify on August (2 and 3,) 6-8, (9 and 14,) 27
    and 28

    Parenthesis means lower probability of activity enhancement."

    Spaceweather.com reminds us, "BE ALERT FOR PERSEID FIREBALLS: Earth
    is entering a stream of debris from giant Comet Swift-Tuttle, source
    of the annual Perseid meteor shower. Forecasters say the shower
    won't peak until Aug. 12 and 13, but already NASA cameras are
    catching Perseid fireballs streaking over the USA. The Perseids
    produce more fireballs than any other annual shower--largely due to
    the size of the parent comet--so your chances of seeing one are
    good."

    Larry Koziel, K8MU sent this, about simulating the sun in a lab:

    https://bit.ly/2LQLP0N

    Larry and several others including Max White, M0VE reported recently
    about solar tsunamis:

    https://bit.ly/2OvhlDr

    George, N2CG in Saddle Brook, New Jersey wrote on July 29:

    "So far this year's Summer E's Season daily NA to Europe 6m FT8 mode
    openings have mostly bypassed the FN20 and adjacent grids and
    favoring the NA South East (especially grids EL and EM) as seen
    daily on the DXMAPS Website.

    Whatever EU openings I did manage to work so far were short lived
    lasting just a few minutes to 20 minutes at best.

    However that changed on Sunday July 28, 2019 beginning around 2100
    UTC in the NA South East Coast area and around 2200 UTC at my NJ QTH
    FN20wv when primarily Finland with a few Sweden and Norway stations
    came in with very good FT8 mode signals for over an hour. I managed
    to decode the following stations: OH2MA, OH2FQV, OH2FNR, OH3XF,
    LA2XPA and SM3CCM and I worked OG2M, OH3SR and OH3XA. This was my
    very first time working Finland on 6m and shortly after my QSO with
    OH3SR he verified our QSO on LoTW!

    August will bring the prime 6m E's Season to a close. However, maybe
    the 6m gods have another surprise opening before the end of the
    season."

    The latest from WX6SWW:

    https://youtu.be/UpyFOZLacvw

    If you would like to make a comment or have a tip for our readers,
    email the author at, k7ra@arrl.net.

    For more information concerning radio propagation, see the ARRL
    Technical Information Service at
    http://arrl.org/propagation-of-rf-signals. For an explanation of
    numbers used in this bulletin, see http://arrl.org/the-sun-the-earth-the-ionosphere.

    An archive of past propagation bulletins is at http://arrl.org/w1aw-bulletins-archive-propagation. More good
    information and tutorials on propagation are at http://k9la.us/.

    Monthly propagation charts between four USA regions and twelve
    overseas locations are at http://arrl.org/propagation.

    Instructions for starting or ending email distribution of ARRL
    bulletins are at http://arrl.org/bulletins.

    Sunspot numbers for July 25 through 31, 2019 were 0, 0, 0, 0, 0, 0,
    and 0, with a mean of 0. 10.7 cm flux was 68.2, 67.6, 66.7, 67.1,
    66.1, 66.2, and 66.9, with a mean of 67. Estimated planetary A
    indices were 3, 3, 4, 4, 5, 8, and 8 with a mean of 5. Middle
    latitude A index was 3, 4, 4, 7, 5, 8, and 10, with a mean of 5.9.
    NNNN


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