I don't believe there is a significant difference in UV radiation
between 100,000 feet or so and the ground. Plastics at ground level
that are intended to be exposed to direct sunlight for long periods of
time routinely have UV protection added to them.
On 3/22/19 9:56 AM, NIzar Mullani via BVARC wrote:
Ravi,
Glad you mentioned UV radiation as a heating source. I had not thought
about this before. As we get into rarefied air, the very short
wavelength UV light in the 200 to 300 nm range could also become very
damaging to the superficial layers of material.
I wonder if anyone has looked into how this extra short UV radiation
effects balloon materials, and, whether it plays a role in the
longevity of balloon material!
Nizar
*From:*BVARC [mailto:bvarc-boun...@bvarc.org] *On Behalf Of *Ravi
Patrick Ratnala via BVARC
*Sent:* Thursday, March 21, 2019 5:11 PM
*To:* BRAZOS VALLEY AMATEUR RADIO CLUB
*Cc:* Ravi Patrick Ratnala;
the-woodlands-amateur-radio-c...@googlegroups.com; w5...@w5sfa.org;
patrick.k...@aviatnet.com; john Parmalee; richard_g_nel...@fpl.com;
n...@mailman.qth.net
*Subject:* Re: [BVARC] Especially for those that won’t be able to make
it to the Houston HamFest this weekend . PLEASE REPOST
Sounds like y'all are talking about moving through the tropopause;
from the troposphere, and upward through the stratosphere. Temperature
decreases (generally) with altitude in the troposphere, because this
region is ruled by thermal heating of the ground (and associated
boundary layer), convection, and adibatic expansion. Once you get
into the stratosphere, temperature increases with altitude due to
heating by UV radiation. (Obviously this is a short form description.)
73, Ravi
On 3/21/2019 1:16 PM, Bruce via BVARC wrote:
i would have thought as the balloon gets higher with thinner air
that the temperature would get colder. you say it goes up.
interesting. i may need to take a look at that. neat experiment.
73...bruce
Sent from my iPhone
On Mar 21, 2019, at 1:10 PM, john Parmalee via BVARC
<bvarc@bvarc.org <mailto:bvarc@bvarc.org>> wrote:
*Especially for those that won’t be able to make it to the
Houston HamFest this weekend.*
*Two Balloon launches with ham gear on board. You can participate. *
*Live video of both launches **https://zoom.us/i/2815436502*
*9:30 AM BLT-51 will launch*
*You can track with **http://APRS.fi <http://aprs.fi/>**search
**the call W5ACM-10. *
*You can Google APRS to find the site.*
*BLT-51 will be a floater, designed to be tracked via APRS and
glide across the country, and hopefully even further. The last one
went to Florida in about six hours.*
*Around 1:00 PM another launch BLT-52*
*BLT-52 is a “popper.” **Designed to go up as high as possible and
burst, also to be tracked via APRS. Last August a popper flew to
nearly 100,000 feet. “To the edge of space.”*
*W5ACM Cross-band FM repeater will be in board with with *
*Input on 147.435 MHz **ß**-----**à**Output on 446.550 MHz no
tone, open to all to work *
*A WB8ELK APRS Tracker on 144.390 MHz with the call W5ACM-11 will
be on board.*
*You can track at **http://APRS.fi <http://aprs.fi/>**search for
W5ACM-11*
*On board also the AB5SS Smart Beeper**on 10 and 20M 14.318 &
28.322 mHz, the temperature in CW call sign and BL-52. Wach as the
balloon passes through 60,000 feet the Temperature to rise. *
*The video will also be recorded for later playback as well, and
depending on the size of the captures, they will either be in the
groups.io <http://groups.io> FILES area
**https://groups.io/g/Ham-Radio-Tech-Notes/files** , or my
website.K5WH.net <http://website.K5WH.net>*
.
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Talk it up! On the air about every event, every meeting, every net, every
time, talk about the club, ham fests, events and people.
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_______________________________________________
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Radio,Radio,Radio We are a radio Club!
Talk it up! On the air about every event, every meeting, every net, every time,
talk about the club, ham fests, events and people.
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Message delivered to ka8...@ka8kpn.org
--
Jonathan Guthrie
ARS KA8KPN
_______________________________________________
BVARC mailing list
Radio,Radio,Radio We are a radio Club!
Talk it up! On the air about every event, every meeting, every net, every time,
talk about the club, ham fests, events and people.
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