From bclark@nrao.edu Tue May 3 08:55:31 2005 Return-Path: Date: Tue, 3 May 2005 08:55:30 -0600 (MDT) From: Barry Clark To: analysts@nrao.edu Subject: RE: BK114C and BK114D Cc: schedsoc@nrao.edu X-Sun-Charset: US-ASCII Content-Length: 4529 X-Lines: 126 Status: RO ----- Begin Included Message ----- >From pkondratko@cfa.harvard.edu Mon May 2 21:49:17 2005 Return-Path: From: "Paul Kondratko" To: "'Barry Clark'" Cc: Subject: RE: BK114C and BK114D Date: Mon, 2 May 2005 23:49:09 -0400 Dear Barry, Considering the terrible weather over the previous weekend, it is best for us to abandon the observation. Rescheduling both segments after October sounds good. Thank you and Best Regards, Paul -------------------------------------------------------------------- Paul T. Kondratko Harvard-Smithsonian Center for Astrophysics 60 Garden Street, Mail Stop 10 Cambridge, MA 02138, USA Telephone: (617) 496-3433 Fax: (617) 495-7105 > -----Original Message----- > From: Barry Clark [mailto:bclark@aoc.nrao.edu] > Sent: Monday, May 02, 2005 7:00 PM > To: pkondratko@cfa.harvard.edu > Cc: schedsoc@nrao.edu > Subject: Re: BK114C and BK114D > > There is no way we can arrange to reschedule this before > summer weather starts, and we are loath to reschedule without > a reasonable chance for good weather. If you choose to > abandon this observation, we will reschedule it sometime > after October. Let us know your preference. > > > From pkondratko@cfa.harvard.edu Tue Apr 26 20:05:35 2005 > > Return-Path: > > From: "Paul Kondratko" > > To: "'Joan Wrobel'" , > > "'Barry Clark'" > > Cc: , > > Subject: BK114C and BK114D > > Date: Tue, 26 Apr 2005 22:04:58 -0400 > > > > Dear Joan and Barry, > > > > I have reviewed the weather and Tsys information for > programs BK114C > > and BK114D. Below this email, I am attaching a table that > summarizes > > briefly the weather conditions at each station. > Unfortunately, most if > > not all of the stations were affected by very bad weather. > As you are > > aware, both BK114C and BK114D are 1 cm phase referencing > experiments > > and, given the source strengths (<40 mJy), are challenging > enough even > > under ideal weather conditions. I am afraid that > thunderstorms, gusty > > winds, snow, and rain have considerably decreased our chances of > > successfully imaging the weak maser emission. Consequently, how > > feasible is it that we can surrender the data without > correlation and > > request re-scheduling of both segments in winter 2005/2006? > > > > Best Regards, > > > > Paul > > > > P.S. I would greatly appreciate your prompt response since it will > > affect my observing strategy for BK114E segment. > > > > > > ================= BK114C ================= > > VLA: thunderstorms, gusty winds > > GBT: light snow > > KP: 55+ mph wind > > HN: rain > > BR: wind gust > 35 mph > > SC: heavy cloud cover, occasional sprinkles > > NL: high scattered broken clouds, occasionally gusty winds. > > > > MK: partly cloudy, but mostly clear. occasional gusty winds. > > > > PT: raining, 55+ mph wind stow warning, autostowed due to winds > > LA: raining > > VLBA: Tsys between 100 and 400 K in general > > > > ================= BK114D ================= > > PT,LA,SC: rain > > OV: gusty winds > > MK: wind gusts > 35 mph > > KP: increasing cloud cover > > HN: Overcast, recent rain > > NL: gusty winds. > > FD: 35 mph gusty winds, t-storms in vicinity, skies are overcast, > > small hail, rain > > Y: mostly cloudy, isolated rain showers, sky cover 40-80%, > gusty winds, > > seceral antennas autostowed due to high winds > > "Antennas are not phasing up well. Almost all antennas > have a phase > > difference of >30 degrees from that of the reference antenna. > > This is possibly due to an observing frequency near the > lower receiver > > limit coupled with unfavorable weather conditions. > Moreover, numerous > > antennas have frequent Tsys fluctuations causing data to > be flagged." > > VLBA: Tsys between 100 and 400 K in general > > > > -------------------------------------------------------------------- > > Paul T. Kondratko Harvard-Smithsonian Center for Astrophysics > > 60 Garden Street, Mail Stop 10 Cambridge, MA 02138, USA > > Telephone: (617) 496-3433 Fax: (617) 495-7105 > > > ----- End Included Message -----