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The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Hi Roelof, I am not actively following day-by-day reports these days, but I do remember a condition in one of the last Solar minimum where after a long geomagnetically quiet period signals seemed to be depressed. I postulated that maybe the ionisation of the E-region was not only dependent on cosmic rays but maybe had a charge input from the Solar wind. After a 30 day period with Kp continualy below 3 we had a Kp=4 coronal hole flow event and propagation immediately improved again. I wondered, but could not find any supporting evidence, whether the ionosphere could ''weaken'' and leak signals into space leading to weaker reception. [...] Content analysis details: (0.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [65.20.0.208 listed in list.dnswl.org] 0.2 STOX_REPLY_TYPE No description available. -0.0 SPF_PASS SPF: sender matches SPF record 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 6ffbd2c9950b634d6cc91f9565b01a8b Subject: Re: LF: WSPR 475 kHz Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.6 required=5.0 tests=FORGED_MUA_OUTLOOK autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Hi Roelof, I am not actively following day-by-day reports these days, but I do remember a condition in one of the last Solar minimum where after a long geomagnetically quiet period signals seemed to be depressed. I postulated that maybe the ionisation of the E-region was not only dependent on cosmic rays but maybe had a charge input from the Solar wind. After a 30 day period with Kp continualy below 3 we had a Kp=4 coronal hole flow event and propagation immediately improved again. I wondered, but could not find any supporting evidence, whether the ionosphere could ''weaken'' and leak signals into space leading to weaker reception. Just a wild idea but maybe worth checking against dates and geomagnetic activity. Alan G3NYK ----- Original Message ----- From: "Roelof Bakker" To: Sent: Saturday, November 03, 2018 4:16 PM Subject: Re: LF: WSPR 475 kHz Mike, Donīt underestimate the power of propagation. NDBīs from Canada and also MW broadcast stations have been much stronger than I have seen for years. Also the number of decodes of Canadian DGPS stations has been dramatically improved. The signal of VO1NA on 137.777 kHz produces audio copy here. 73, Roelof Bakker, pa0rdt