<div dir="ltr">All,<div>The following discrepancies were noted this day:</div><div><br></div><div>

<div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial;background-color:rgb(255,255,255)"><b style="font-size:12.8px"><font color="#0000ff">Deadhorse.  There were bad total field values recorded during minutes 1107 UT, on 4/1/18 (YD 091)  and 1720 UT, on 4/2/18 (YD 092).</font></b></div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial;background-color:rgb(255,255,255)"><b style="font-size:12.8px"><font color="#0000ff"><br></font></b></div><div style="text-align:start;text-indent:0px;text-decoration-style:initial;text-decoration-color:initial;background-color:rgb(255,255,255)"><font color="#ff0000"><b style="font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px">Shumagin.  At 2127 UT, on 3/30/18 (YD 089), there was an offset to the Fluxgate magnetometer.  The offset remained</b><b style="font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px"> until 2140 UT, on 3/31/18 (YD 090), and which time there was another another offset, until 0008 UT, on 4/1/18 (YD 091).  At this time, there was an Artificial Disturbance until 0105 UT, on 4/1/18 (YD 091).  After that time, there remained a significant offset to the H, E, and Z data. After talking to Tina Anderson, I learned the machine used by a contractor to trench between the Variations Building and the Electronics Building had been left in close proximity to the 

<b style="font-family:arial,sans-serif;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;font-size:12.8px">Variations Building.   The Trenching machine is still near the 

<b style="font-family:arial,sans-serif;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;font-size:12.8px">Variations Building.  I asked Tina to contact the contractor and ask him to move the machine outside the fenced area when not in use. The Dist and SV plots show effects from these disturbances. </b></b></b></font></div><div style="text-align:start;text-indent:0px;text-decoration-style:initial;text-decoration-color:initial;background-color:rgb(255,255,255)"><font color="#0000ff" style=""><b style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px"><b style="font-family:arial,sans-serif;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;color:rgb(34,34,34);font-size:12.8px;font-weight:400"><b style="font-family:arial,sans-serif;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;color:rgb(34,34,34);font-size:12.8px;font-weight:400"><br></b></b></b></font></div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial;background-color:rgb(255,255,255)"><b style="font-size:12.8px"><font color="#0000ff"><span style="font-size:12.8px">Dist, SQ and SV. See above disturbances to the Shumagin Observatory data.</span></font></b><br></div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial;background-color:rgb(255,255,255)"><span style="font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><font color="#0000ff"><b><br></b></font></span></div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial;background-color:rgb(255,255,255)"><span style="text-align:start;text-indent:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><font color="#0000ff"><b><span style="text-align:start;text-indent:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><font color="#0000ff"><span style="font-size:12.8px">Boulder E-Field.  None</span></font></span></b></font></span></div></div><div><br clear="all"><div>

<b style="color:rgb(0,0,255);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span style="font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial">DST. <span> </span></span></span><span style="font-size:12.8px">There is the <span class="gmail-m_1279933179262584788m_-3112327762979607758gmail-m_2211898979332883115gmail-m_-6233513516820568374gmail-m_-3840893730070104930gmail-m_-9030155418796022944gmail-m_-5054793621936123105gmail-m_-8691096301322998621gmail-m_2572926524748812295gmail-m_7535836511749105221gmail-m_-2531933207393602040gmail-m_-3259764650837820617gmail-m_-761036240257809399gmail-m_-7162980476312530791gmail-m_-37850137032792681gmail-m_2602765925039608144m_-4293583474061502485gmail-m_6503427114658427093gmail-m_-3747392658200601095gmail-m_-1486669443561360418gmail-m_-6774390905602162080gmail-m_5647709510029416012gmail-m_9174026292177732908gmail-il"><span class="gmail-m_1279933179262584788m_-3112327762979607758gmail-m_2211898979332883115gmail-m_-6233513516820568374gmail-m_-3840893730070104930gmail-m_-9030155418796022944gmail-m_-5054793621936123105gmail-m_-8691096301322998621gmail-m_2572926524748812295gmail-m_7535836511749105221gmail-m_-2531933207393602040gmail-m_-3259764650837820617gmail-m_-761036240257809399gmail-m_-7162980476312530791gmail-m_-37850137032792681gmail-il"><span class="gmail-m_1279933179262584788m_-3112327762979607758gmail-m_2211898979332883115gmail-m_-6233513516820568374gmail-m_-3840893730070104930gmail-m_-9030155418796022944gmail-il"><span class="gmail-il">daily</span></span></span></span> offset in the USGS Dst-1min plot resulting from the corresponding data gap in the plot for Kakioka at around the end/start of each <span class="gmail-m_1279933179262584788m_-3112327762979607758gmail-m_2211898979332883115gmail-m_-6233513516820568374gmail-m_-3840893730070104930gmail-m_-9030155418796022944gmail-il"><span class="gmail-il">day</span></span>.</span></b>

<br></div><div><br></div><div>That's all,</div><div>Ed Sauter</div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><span style="color:rgb(80,0,80);font-family:sans-serif;background-color:rgb(255,255,255)">Edward A. Sauter</span><br style="color:rgb(80,0,80);font-family:sans-serif;background-color:rgb(255,255,255)"><span style="color:rgb(80,0,80);font-family:sans-serif;background-color:rgb(255,255,255)">US Geological Survey</span><br style="color:rgb(80,0,80);font-family:sans-serif;background-color:rgb(255,255,255)"><span style="color:rgb(80,0,80);font-family:sans-serif;background-color:rgb(255,255,255)">Box 25046 DFC, MS 966</span><br style="color:rgb(80,0,80);font-family:sans-serif;background-color:rgb(255,255,255)"><span style="color:rgb(80,0,80);font-family:sans-serif;background-color:rgb(255,255,255)">Denver, CO 80226-0046 USA</span><br style="color:rgb(80,0,80);font-family:sans-serif;background-color:rgb(255,255,255)"><span style="color:rgb(80,0,80);font-family:sans-serif;background-color:rgb(255,255,255)">E-mail: </span><a href="mailto:esauter@usgs.gov" style="color:rgb(17,85,204);font-family:sans-serif;background-color:rgb(255,255,255)" target="_blank">esauter@usgs.gov</a><br style="color:rgb(80,0,80);font-family:sans-serif;background-color:rgb(255,255,255)"><span style="color:rgb(80,0,80);font-family:sans-serif;background-color:rgb(255,255,255)">Phone: 303-273-8471</span><br style="color:rgb(80,0,80);font-family:sans-serif;background-color:rgb(255,255,255)"><span style="color:rgb(80,0,80);font-family:sans-serif;background-color:rgb(255,255,255)">Fax 303-273-8506</span>
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