04/15/2016
There was an upward bump in recent solar activity, with average daily sunspot number for the April 7-13 period at 32 (compared to 19.1 for the previous seven days) and average daily solar flux rising 23 points to 106.1.
Note that what we are seeing now is the occasional uptick in solar activity as the Sun continues its decline to solar minimum, perhaps sometime around 2020.
Average daily planetary A index rose three points to 12.4, and average daily mid-latitude A index from 7.6 to 8.3.
For the near term, predicted solar flux is 110 on April 15-17, 105 on April 18-19, 95 on April 20—22, 100 on April 23, 95 on April 24-29, 90 on April 30 through May 3, then 95, 100, 105, and 110 on May 4-7, 112 on May 8-13, and 115 on May 14-17. Solar flux then drops below 100 on May 21 and beyond.
Predicted planetary A index is 12 on April 15, 8 on April 16-18, 12 on April 19, 8 on April 20, 5 on April 21-22, 12 on April 23, 10 on April 24-25, 8 on April 26, 5 on April 27-28, then 20, 15 and 8 on April 29 through May 1, 5 on May 2-3, then 12 and 8 on May 4-5, 5 on May 6-7, 8 on May 8-9, then 18, 30 and 10 on May 10-12, then 5 on May 13-16 and 8 on May 17-18.
Also on the subject of geomagnetism, we have two predictions from Prague. The first from the Institute of Geophysics of the Academy of Sciences of the Czech Republic. Tomas Beyer predicts for the short term:
Geomagnetic activity forecast for the period April 15-21, 2016
Quiet: Apr 19-21
Unsettled: Apr 15-18
Active: possible but unlikely Apr 17-18
Geomagnetic activity summary:
Maximum of geomagnetic activity has been recorded at Apr 12-13 when the local K-index reached K=5. The active conditions continued till morning Apr 14, then turned to unsettled.
Next week, we expect at most quiet to unsettled conditions only with possible active episode between Apr 17-18. Nevertheless, it may be only an isolated event. Then, we expect return of quiet to unsettled level.
From Petr Kolman, OK1MGW, of the Czech Propagation Interest Group, he predicts:
Geomagnetic activity forecast for the period April 15-May 11, 2016
Geomagnetic field will be:
Quiet on April 21-22, May 6-7
Mostly quiet on April 17-18, 27-28, May 1-3, 8
Quiet to unsettled on April 15-16, 19-20, 25-26, May 11
Quiet to active on April 23-24, 29-30, May 4-5, 9-10
Active to disturbed on May (9-10)
Amplifications of the solar wind from coronal holes are expected on April 18-20, 23-24, 28-30, May 4-5, 8-11
Remarks: Parenthesis means lower probability of activity enhancement.
Recently KL7JT asked a question which we forwarded to K9LA. Here is a link to the exchange, which includes links to the images referenced. Just click Download This File at each link.
Here is an update on the NASA STEREO mission:
And this link is to the STEREO tool itself:
Bill Liles, NQ6Z, wrote about a QSO Today podcast (Number 081) he heard:
“I am curious about one comment you made. You were asked about effect from solar or lunar eclipse and you answered ‘no.’
“I agree with that answer re lunar eclipse. I am wondering about the reason for the answer with respect to solar eclipse. During the time of the eclipse over a patch of the ionosphere, which granted is only a few minutes, the Sun’s radiation is blocked so one should see recombination in the D layer and thus it will not be as absorptive as during normal daytime. Thus MF and low HF freqs should experience nighttime propagation characteristics.
“This effect, as far as I have found, was first observed in 1912. Appleton also used this effect in the 1929s to help answer the question of what causes the ionization by the Sun, particles or electromagnetic waves.
“Solar eclipse effects have been the subject of many scholarly reports and a few books using real data.
“Thus my curiosity as to why your answer was ‘no?’ Were you meaning on a more global scale? As it seems true on a local scale.
“BTW, ARRL and Scientific American did a study on this effect in the 1920s and one comment was that 75 meters behaved as if it was nighttime.”
The answer? I was wrong. In response, Bill sent a pdf about effects on radio from a solar eclipse in 1999, which you can download here: http://bit.ly/1Wvrk7c
For more information concerning radio propagation, see the ARRL Technical Information Service at http://arrl.org/propagation-of-rf-signals. For an explanation of the numbers used in this bulletin, see http://arrl.org/the-sun-the-earth-the-ionosphere. An archive of past propagation bulletins is athttp://arrl.org/w1aw-bulletins-archive-propagation. More good information and tutorials on propagation are at http://k9la.us/.
My own archives of the NOAA/USAF daily 45 day forecast for solar flux and planetary A index are in downloadable spreadsheet format athttp://bit.ly/1VOqf9B and http://bit.ly/1DcpaC5 .
Click on “Download this file” to download the archive, and ignore the security warning about file format. Pop-up blockers may suppress the download.
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 athttp://arrl.org/bulletins.
Sunspot numbers for April 7 through 13 were 26, 27, 29, 26, 41, 34, and 41, with a mean of 32. 10.7 cm flux was 92.3, 98.3, 105.5, 110.6, 116.6, 111.3, and 108.2, with a mean of 106.1. Estimated planetary A indices were 17, 9, 3, 7, 6, 19, and 26, with a mean of 12.4. Estimated mid-latitude A indices were 10, 6, 3, 6, 5, 12, and 16, with a mean of 8.3.
Source:ARRL
Model: FX-9A Model: LSB / USB / CW (iambic keying mode A and B) Supports manual and automatic key, the machine automatically detect, you can also set the menu Frequency range: 160M / 80M / 40M / 30M / 20M / 17M / 15M / 12M / 10M 9 amateur b... Read more
More
![How to listen to Hurricane Net Frequencies [ HWN ]](https://qrznow.com/wp-content/uploads/2018/09/news_ham_radio_ycqtbi-90x60.jpg)
![FT8 and the 6m band [ Club Log ]](https://qrznow.com/wp-content/uploads/2021/03/clublog-2006-2021-1-90x60.png)
![“Life Above 50 MHz” [ ARRL PODCAST ]](https://qrznow.com/wp-content/uploads/2019/01/vhf-136-174m-ham-radio-4elements-outdoor-yagi-antenna-vhf-radio-repeater-base-yagi-antenna-90x60.jpg)
Remote Shack RBC-212 is a remote base controller equipped with two link input ports. One radio control port and two multi-function ports each on the A... Read more
CVA DX CONTEST Photo : Escola de Comunicações The CVADX Contest is an international competition between radio amateurs1.0. Date, Modes: CW or SSB1.1.... Read more
The CQ WW is the largest Amateur Radio competition in the world. Over 35,000 participants take to the airwaves on the last weekend of October (SSB) an... Read more
DXMINI is your gateway to digital HAM radio… Our devices enable your digital radio to communicate over the internet sending your communications... Read more
Here we take a look at the QYT KT-WP12 mini dual band radio. Or, otherwise known as an ANYSECU WP-9900. PC ProgramDual BandExternal Speaker/PTTDTMF fu... Read more
The FCC has denied a request by Expert Linears America LLC to waive §97.317(a)(2) of the Amateur Service rules limiting amplifier gain. Expert, of Mag... Read more
The support structure of the Light Beam Plus Antenna series is very different from that of any other antenna that is currently on the market. Manufact... Read more
Waters & Stanton, (W&S) Europe’s Ham store, advise today of a new software release PowerSDR/OpenHPSDR PS v3.3.7 which has many new feat... Read more
The Atlantic Telegraph Company’s 1858 failure set the stage for success just eight years later By Allison Marsh Photo: Division of Work & Industry... Read more
Information from Bernie, W3UR Editor of Daily DX: The SV2ASP/A callsign was pirated. DL5EBE reports that Apollo underwent major surgery last month and... Read more
Product Description This is an RTL-SDR software defined radio receiver with RTL2832U ADC chip, R820T2 tuner, 1PPM TCXO, and SMA F connector. Tunes fr... Read more
Say goodbye to blocked USB ports! The tiny NESDR Nano 3 is the ideal SDR for portable and embedded applications. Quad SDRs on a Raspberry Pi? USB OTG?... Read more
4 Bands • Coverage 40-10m • Bandwidth Full • SWR 1.15:1 • Power 1kW • Traps 25.4mm formers • Tubing 31.75mm... Read more
NASA has reestablished contact with its Voyager 2 spacecraft as it travels more than 1.6 billion miles from Earth – after the probe was left fl... Read more
More
Remote Shack by MFJ RBC-212
CVA DX CONTEST
CQ WW Contest SSB 2020
DXMini Pi-Star Hotspot for Amateur Radio
The Smallest Dual Band Mobile Radio EVER! QYT KT-WP12 / ANYSECU WP-9900
FCC Denies Expert Linears’ Request for Waiver of 15 dB Rule, Petition Pending
Light Beam Plus Antenna – LBP-20M
Significant update and improvements to OpenHPSDR for Apache Labs Radios
The First Transatlantic Telegraph Cable Was a Bold, Beautiful Failure
Pirate ! SV2ASP/A Mount Athos
NEW PRODUCTS: $20 RTL-SDR WITH 1PPM TCXO, SMA F CONNECTOR AND R820T2
NooElec NESDR Nano 3 – Premium Tiny
![HUSTLER 4-BTV [ 40-10m ]](https://qrznow.com/wp-content/uploads/2022/02/4btv-190x122.jpg)
HUSTLER 4-BTV [ 40-10m ]
NASA reestablishes contact with 43-year-old Voyager 2 which is 11.6 BILLION miles from Earth after repairs to antenna in Australia left spacecraft flying solo for seven months
Warning: file_get_contents(https://plusone.google.com/_/+1/fastbutton?url=https%3A%2F%2Fqrznow.com%2Fthe-k7ra-solar-update-6%2F): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found in /home/qrznow/public_html/wp-content/themes/goodnews5/framework/functions/posts_share.php on line 151
