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Akatsuki Venus Climate Orbiter
pandaneko
post May 7 2016, 11:10 PM
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Page-21

Scientific instruments (1)

1. 1μm camera IR1 (Univ. Tokyo・JAXA)

λ= 0.9、0。97、1.01 μm (window in near infrared region) filed of view 1212、1024x1024 pixels、detector SiCCD

-> lower layer clouds、 active volcanoes、surface materials

2. 2μm camera IR2 (JAXA)

λ= 1.73、2.26、2.32 μm (wind ow in near infrared region)、 2.02 μm (CO2 absorption)、1.65 μm (Zodiacal light)
field of view 1212、1024x1024 pixels、 detector PtSi

-> lower layer clouds、 seed size、 cloud top height、
lower layer carbon monoxide

3. Ultra violet imager UVI (Univ. Hokkaido・JAXA)

λ= 283、365 nm field of view 1212、1024x1024pixels、detector SiCCD 
-> SO2 、unidentified absorbing materials

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pandaneko
post May 7 2016, 11:32 PM
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Page-22

Scientific instruments (2)

5. Mid infrared camera (Univ. Rokkyo・JAXA)

λ= 10 μm (width 4 μm ) field of view 12.416.4、248x328pixels、 detector: uncooled borometer

-> cloud top height

6. Ligthening/atmospheric lights camera LAC (Univ. Hokkaido)

λ= 777、551、553、558、630 nm field of view 1616、8x8 pixels、detector: APD (32kHz sampling)

-> lightening discharge、 O2 /O derived atmospheric lights

7. Ultra stable oscillator USO (JAXA)

Radiowave occultation

-> Temp. and sulfuric acid vapour distrbution with height

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pandaneko
post May 8 2016, 12:02 AM
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Page-25

Wind velocity field from tracing cloud blocks

(inside square): Patterns move

(Caption for the largest graphic):

Wind trace vectors by Mariner 10 (NASA)

(at very bottm, lower left):

Examle of cloud vector tracing from ground stations

Page-26

Observation plan

(inside largest green box at top):

Global imaging:
Visualise, as 3-D continuous movies, changes in trace gases and clouds moved about by the high speed streams.
Also, monitor ground surface.

(inside small yellow box on left):

Look at cloud layer structure from their side

(inside pinkkish, purplish box down bottom left):

Radiowave occulation: Look at atmospheric layer structure by receiving radiowave signals at ground stations
that have gone through Venusian atmosphere horizontally

(inside pale blue box):

Close-up imaging: Micro structure 3-D monitoring of cloud unevenness, detection of lightenings at night

(character strings without box, near orbit):

Orbital period: 15 days until March 2016, and 9 days thereafter

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pandaneko
post May 8 2016, 12:33 AM
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Page-27

Instrument status

(bottom catption for left hand image):

Thermal radiation from cloud tops

(top caption for right hand image):

Venus at 600,000 km, closest approach since December 2010

(three charater strings at bottom):

1. Start up tests were conducted on LIR, UVI, and IR1 (to be talked about)
2. IR2 and LAC, not yet confirmed
3. 3 months after re-insertion will be spent on snspection

Page-28

Start up tests on cameras, October 2015

(at very bottom):

We can only see dark space and noise as there was no star in the field of view. We can at least confirm minimum health of cameras.

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pandaneko
post May 8 2016, 08:35 AM
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Page-29

Observation plan after orbit insertion

(above lefthand box):
Until end december 2015

(above righthand box):
Until March 2016

(below lefthand box):

With LIR、IR1(1μm)、IR2(2μm)、UVI cameras adjustments of exposure time etc. will be made based on imaging tests.
Each camera is expected to contribute test images.

(below righthand box):

We will gradually move to normal mode of observation. Images and movies will be made publically available.
Radiowave occultation observation will be done after March 2016. LAC observation will be after April 2016.

(on each of the diagrams characters in black read "Akatsuki's orbit")

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pandaneko
post May 8 2016, 08:55 AM
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Page-30

This is about sucess criteria and it has been covered in the latest JAXA report.

Page-31 to page-36

These are not science, mostly message campaign etc. such as :

http://global.jaxa.jp/messages/akatsuki.html

Message contributions form the Planetary Society numbered at 54,632.
Groups at 148,204 and individuals via internet at 57,378

From page-37 on there are some potentially interesting pages. So, translation will
continue for a few more pages.

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pandaneko
post May 9 2016, 04:43 AM
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QUOTE (pandaneko @ May 8 2016, 05:55 PM) *
From page-37 on there are some potentially interesting pages. So, translation will
continue for a few more pages.

P


Above is not exactly true if you read these pages. They are not directly relevant to Venus, except instrument specs.
Instrument sepcs have been covered before.

So, no more translation and this is the end of JAXA Nov 2015 report.

P

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Paolo
post May 23 2016, 06:29 AM
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atmosphere animations from IR2 (in Japanese)

http://www.isas.jaxa.jp/j/enterp/missions/...ile/index.shtml
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JRehling
post May 23 2016, 04:46 PM
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WOW. After I watched it about ten times, I noticed the slow morphing of features over time. This smooth animation was made from just 4 frames, so there was effort put into animating it nicely like this.

Obviously, this detail is due to clouds, not the surface: The surface rotates much more slowly.

IR2 (a term which conveniently is written in the Latin alphabet) images at 2.26μm, and the signal for this instrument is dominated by atmospheric variation at 35-50 km altitude. That will be true of all results mentioning 2.26μm, which can save all of us non-Japanese speakers from puzzling too much about what the text says.
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atomoid
post May 23 2016, 11:16 PM
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Fascinating, its a 16-hour sequence.. I don't recall ever seeing cloud animations for venus, unless i missed it.
Chrome did a pretty good job of translating, so might come in handy.. here's a the current state with translation of that page:

QUOTE
Is an image of the attention that "Akatsuki" is taken.
2016 May 23 [update] New
Venus night side of the moving image by IR2 camera [Click for larger image] [GIF: 5.5MB] ISAS / JAXA

The original image [Click for larger image] ISAS / JAXA IR2 videos of Venus night plane by the camera video was based on 2016 March 29, the Venus night side image taken from a distance 360,000 km in IR2 wavelength 2.26μm. Four original image has been obtained in the 4-hour intervals from 16 hours 03 minutes (JST). During 4 hours, clouds has moved approximately 10 degrees by the super rotation, so as to fill therebetween and a smooth moving by rotating slightly the original image by calculation. From the video, to understand as deformation and prevalence of clouds take in hand, if reduced to 2 hours and 1 hour imaging interval in a future of steady observation, it is possible to obtain a video of more smooth, high-definition, Venus atmosphere understanding of is expected to proceed at once.


QUOTE
2016 May 11, 2011 [update]
[Click for larger image] Venus pseudo-color image by the camera IR2 ISAS / JAXA shooting equipment: 2μm camera IR2 shooting date and time: 2016 March 25 commentary: IR2 pseudo color of the Venus from 1.735μm image and 2.26μm image of night face. 1.735μm → red, 2.26μm → blue, and both average of → colored green synthesis. Many dayside light that covers the brightness is strong 1.735μm in the night side of the, is because that's near the day and night boundary has become Orange sexy. The difference subtle shades of the night side is considered to represent the differences in the size of the cloud particles.
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JRehling
post May 24 2016, 06:44 PM
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It's a challenge to get coverage sufficient to animate the clouds on Venus: Usually, a view covers only about 90 on the day or night side (whichever is being used), and it takes about 4 days for rotation to occur, so a given parcel of cloud is only seen for part of a rotation. It would be difficult to track the same area without interruption for longer than 2 days.
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pandaneko
post May 25 2016, 01:08 AM
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Thanks, Paolo

The caption is as follows.

Animation of Venus nightside by IR2 camera

This is based on the images taken at 360,000km on 29 March 2016 at 2.26 micron. Original 4 images were obtained every 4 hours
from 16:03 (JST). Within the 4 hour period it is seen that the clouds moved 10 times due to super rotation.

Calculated data were used to make the animation look smooth enough.We can clearly see cloud shape deformation.

As we shift to normal mode of observation the frequency of taking these pictures will increase.
2 hours, then down to 1 hour will make much smoother animations, helping us to understand the Venusian atmospheric motion
in a drastic way.

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pandaneko
post May 25 2016, 01:13 AM
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Big apologies!

not 10 times, but yes, 10 degrees! Actually, this Google translation, I did not read, before translation,
but it seems very good, actually

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nprev
post May 25 2016, 03:33 AM
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Congratulations on your efforts being featured in Emily's latest Planetary Society blog entry, Pandaneko! smile.gif


--------------------
A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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pandaneko
post May 28 2016, 09:58 AM
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QUOTE (nprev @ May 25 2016, 12:33 PM) *
Congratulations on your efforts being featured in Emily's latest Planetary Society blog entry, Pandaneko! smile.gif


Thank you and a big thank you, Emily. It is good to know that my contribution is formed into a coherent story.
To be honest, my understanding of the whole science tends to be fragmented when I
am translating. I can now take a step back and see the whole pictures!

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