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[Propagation+Space Weather] The W1AW Weekly Propagation Report - 2021 Fe

To: propagation@contesting.com
Subject: [Propagation+Space Weather] The W1AW Weekly Propagation Report - 2021 Feb 05 16:04 UTC
From: nw7us@sunspotwatch.com
Reply-to: Practical radio-wave propagation and space weather <propagation@contesting.com>
Date: Fri, 5 Feb 2021 16:04:33 +0000
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The following is the weekly propagation bulletin from W1AW / ARRL (posting on 20210205 16:04 UTC):

QST de W1AW Propagation Forecast Bulletin 6 ARLP006 >From Tad Cook, K7RA Seattle, WA February 5, 2021 To all radio amateurs

SB PROP ARL ARLP006 ARLP006 Propagation de K7RA

We just witnessed five days in a row with zero sunspots, but on February 2 a small sunspot group (2801) appeared on our Sun's northwest limb. It soon rotated off the Sun's visible area, and on Thursday the sunspot number was back to 0.

We will probably see a few more days with no sunspots, but a return after February 11 is possible when increased solar flux is forecast.

Average daily sunspot numbers declined from 28.1 reported in last week's Propagation Forecast Bulletin ARLP005 to 3.3 this week. Average daily solar flux dropped three points from 77.2 to 74.2.

Average daily planetary A index went from 9.4 to 6.7.

Solar flux over the next 30 days is predicted at 74 on February 5-11, 76 on February 12-16, 78 on February 17-22, 76 on February 23-25, 74 on February 26, 73 on February 27 through March 1, and 72 on March 2-7.

Predicted planetary A index is 5, 8, 16 and 10 on February 5-8, then 8 on February 9-10, 5 on February 11-20, then 20, 16 and 12 on February 21-23, 5 on February 24-27, then 18, 12 and 8 on February 28 through March 2, 5 on March 3-5, and 10 on March 6-7. A coronal hole may return on March 20-21 causing a rising A index.

Geomagnetic activity forecast for the period February 5 to March 2, 2021 from F.K. Janda, OK1HH.

'Geomagnetic field will be, quiet on: February 18-19, 26-27 quiet to unsettled on: February 5-6, 9-13, 17, 24-25 quiet to active on: February 7-8, 14-16, 20, 23, 28 unsettled to active: February 21-22, March 1-2 active to disturbed: nothing predicted 'Solar wind will intensify on: February (8-10, 15-17, 20-22,) 23-24, (25-28). 'Remarks: - Parenthesis means lower probability of activity enhancement. - Predictability of changes remains low, as indications remain ambiguous.'

N0JK reported, 'Had some sporadic-E on 50 MHz the evening of February 1 (February 2 UTC). XE2TT (DL44) on 50.313 MHz, 0205 UTC. I was on Saturday night for a couple of hours January 31 UTC for the CQ 160 M CW contest. Band noisy due to snow and high winds in eastern Kansas. Made over 50 contacts with 5 watts and a rain gutter antenna.'

More from Jon the next day:

'Some sporadic-E on 6 Meters February 2, 3 and 4. Es is rare in February. I worked WA2VJL (EL16) on 50.313 MHz FT8 from my mobile set up on the 2nd. See below.

'N0LL (EM09) is back on 6 Meters after repairing storm damage to his antenna. On February 3 Larry worked XE2ML on 6 Meters. VK3OER in Australia spotted K0TPP in Missouri! Possible sporadic-E-TEP across the Pacific Ocean.

'XE2ML 21/02/04 0010Z 50313.0 EM09DL74 N0LL N0LL 21/02/04 0009Z 50313.0 DL74QB EM09 TNX qso 7 XE2ML

'Had some Es when I checked from my car at work. Decoded XE2OR, N7WB/p, K0JY, and XE2ML.

'N7WB/P 21/02/03 2354Z 50313.0 EM28IX ES DM51BI N0JK

'VK3OER spotted K0TPP!

'K0TPP 21/02/04 0036Z 50313.0 -16 CQ K0TPP correct! VK3OER'

In response to last week's bulletin and the subject of super-huge solar flares, Jon commented: 'The VHF community is ready. Bring it on!'

Article about solar magnetic waves and corona composition:

https://bit.ly/3pRz5Hv

The latest report from Dr. Tamitha Skov, WX6SWW:

https://bit.ly/39P9r0o

An audio tour of the Sunspot, New Mexico solar observatory:

https://bit.ly/39QVAGS

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

For more information concerning radio propagation, see http://www.arrl.org/propagation and the ARRL Technical Information Service web page 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/.

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

Sunspot numbers for January 28 through February 3, 2021 were 0, 0, 0, 0, 0, 12, and 11, with a mean of 3.3. 10.7 cm flux was 75.6, 75.5, 73.7, 73.4, 73.7, 72.9, and 74.3, with a mean of 74.2. Estimated planetary A indices were 5, 3, 2, 1, 5, 17, and 14, with a mean of 6.7. Middle latitude A index was 3, 2, 2, 0, 4, 11, and 10, with a mean of 4.6.


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Links of interest:

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Space Weather and Ham Radio YouTube Channel News:

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..


The W1AW Weekly Propagation Report - 2021 Feb 05 16:04 UTC

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